commit 3ce9bc60197300743e2b036b82187417338fb92a
Author: waalge <waalgy@gmail.com>
Date:   Tue Sep 30 14:42:30 2025 +0000

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..34d718f
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+name = "zerovec-derive"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b96237efa0c878c64bd89c436f661be4e46b2f3eff1ebb976f7ef2321d2f58f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..aa6c910
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "konduit-cli"
+version = "0.0.0"
+edition = "2021"
+publish = false
+rust-version = "1.86.0"
+# license = "MIT" -- set to apache
+
+[package.metadata.release]
+release = false
+
+[dependencies]
+anyhow = "1.0.100"
+bech32 = "0.11.0"
+blockfrost = "1.1.0"
+blockfrost-openapi = "0.1.75"
+clap = { version = "4.5.18", features = ["cargo", "derive"] }
+cryptoxide = "0.5.1"
+hex = "0.4.3"
+minicbor = { version = "0.25.1", features = ["alloc", "derive"] }
+pallas-addresses = "0.33.0"
+pallas-crypto = "0.33.0"
+pallas-primitives = "0.33.0"
+rand = "0.9.2"
+reqwest = { version = "0.12.23", features = ["json"] }
+serde = { version = "1.0.213", features = ["derive"] }
+serde_json = "1.0.138"
+tokio = { version = "1.47.1", features = ["full"] }
+uplc = "1.1.19"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bbe7764
--- /dev/null
+++ b/README.md
@@ -0,0 +1,49 @@
+# Konduit cli
+
+> A first stab at the konduit cli
+
+## TODOs 
+
+- [x] serde for relevant data
+- [ ] env
+    - [ ] wallet keys 
+    - [ ] cardano connection
+- [ ] txs 
+    - [ ] dev
+        - [ ] send 
+        - [ ] publish
+        - [ ] unpublish
+    - [ ] open
+        - [ ] cli params TODO 
+        - [ ] fn params: 
+            - fuel (available utxos)
+            - change address
+            - konduit address : 
+                - `konduit_hash`
+                - maybe stake key
+            - amount (currency is always ada)
+            - datum: 
+                - constants`(tag, add_vkey, sub_vkey, respond_period)`
+    - [ ] add
+    - [ ] sub
+        - [ ] cli params TODO 
+        - [ ] fn args: 
+            - generic script args: fuel, change address, script ref ...
+            - instance input (resolved)
+            - redeemer: receipt = (squash, [cheques])
+    - [ ] close
+    - [ ] respond
+    - [ ] unlock
+    - [ ] expire 
+    - [ ] end 
+    - [ ] elapse
+    - [ ] batch 
+    - [ ] mutual
+- [ ] cardano connection 
+    - [ ] api 
+        - [ ] utxos at (with optional stake key)
+    - implementations:
+    - [ ] blockfrost 
+    - [ ] kupmios
+- [ ] env handling
+- [ ] cmd
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..cea1e2a
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,82 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1757068644,
+        "narHash": "sha256-NOrUtIhTkIIumj1E/Rsv1J37Yi3xGStISEo8tZm3KW4=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "8eb28adfa3dc4de28e792e3bf49fcf9007ca8ac9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1757298987,
+        "narHash": "sha256-yuFSw6fpfjPtVMmym51ozHYpJQ7SzVOTkk7tUv2JA0U=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "cfd63776bde44438ff2936f0c9194c79dd407a5f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..50518c4
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,91 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    rust-overlay,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+        overlays = [rust-overlay.overlays.default];
+      };
+
+      osxDependencies = with pkgs;
+        lib.optionals stdenv.isDarwin
+        [
+          darwin.apple_sdk.frameworks.Security
+          darwin.apple_sdk.frameworks.CoreServices
+          darwin.apple_sdk.frameworks.SystemConfiguration
+        ];
+
+      cargoTomlContents = builtins.readFile ./Cargo.toml;
+
+      version = (builtins.fromTOML cargoTomlContents).package.version;
+      rustVersion = (builtins.fromTOML cargoTomlContents).package."rust-version";
+
+      rustToolchain = pkgs.rust-bin.stable.${rustVersion}.default;
+
+      rustPlatform = pkgs.makeRustPlatform {
+        cargo = rustToolchain;
+        rustc = rustToolchain;
+      };
+
+      my-crate = rustPlatform.buildRustPackage {
+        inherit version;
+
+        name = "my-crate";
+
+        buildInputs = with pkgs; [openssl] ++ osxDependencies;
+        nativeBuildInputs = with pkgs; [pkg-config openssl.dev];
+
+        src = pkgs.lib.cleanSourceWith {src = self;};
+        doCheck = false; # don’t run cargo test
+        CARGO_BUILD_TESTS = "false"; # don’t even compile test binaries
+
+        cargoLock.lockFile = ./Cargo.lock;
+
+        GIT_COMMIT_HASH_SHORT = self.shortRev or "unknown";
+      };
+
+      packages = {
+        my-crate = my-crate;
+        default = packages.my-crate;
+      };
+
+      overlays.default = final: prev: {my-crate = packages.my-crate;};
+
+      gitRev =
+        if (builtins.hasAttr "rev" self)
+        then self.rev
+        else "dirty";
+    in {
+      inherit packages overlays;
+
+      devShell = pkgs.mkShell {
+        buildInputs = with pkgs;
+          [
+            pkg-config
+            openssl
+            cargo-insta
+            (rustToolchain.override {
+              extensions = ["rust-src" "clippy" "rustfmt" "rust-analyzer"];
+            })
+          ]
+          ++ osxDependencies;
+
+        shellHook = ''
+          export GIT_REVISION=${gitRev}
+        '';
+      };
+    });
+}
diff --git a/src/cardano.rs b/src/cardano.rs
new file mode 100644
index 0000000..59f751a
--- /dev/null
+++ b/src/cardano.rs
@@ -0,0 +1,23 @@
+use std::collections::HashMap;
+
+use cardano::Cardano;
+
+pub mod blockfrost;
+pub mod cardano;
+
+const PREFIX: &str = "cardano_";
+
+pub fn from_env(env: &HashMap<String, String>) -> impl Cardano {
+    let cardano_env: HashMap<String, String> = env
+        .iter()
+        .filter_map(|(k, v)| k.strip_prefix(PREFIX).map(|k| (k.to_string(), v.clone())))
+        .collect();
+    match env.get("cardano") {
+        None => panic!("Expect cardano connection details in env"),
+        Some(s) if s == "blockfrost" => {
+            let config = blockfrost::Config::from_env(&cardano_env);
+            blockfrost::Blockfrost::new(config.project_id)
+        }
+        Some(_s) => panic!("Unkown cardano connection"),
+    }
+}
diff --git a/src/cardano/blockfrost.rs b/src/cardano/blockfrost.rs
new file mode 100644
index 0000000..828d0fb
--- /dev/null
+++ b/src/cardano/blockfrost.rs
@@ -0,0 +1,458 @@
+// ORIGINAL SOURCE : https://github.com/CardanoSolutions/zhuli/blob/main/cli/src/cardano.rs
+
+//  This Source Code Form is subject to the terms of the Mozilla Public
+//  License, v. 2.0. If a copy of the MPL was not distributed with this
+//  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+use anyhow::{anyhow, Result};
+use minicbor::decode;
+
+use crate::{tx::plutus::BuildParams, utils::v2a};
+use blockfrost::{BlockfrostAPI, Pagination};
+use blockfrost_openapi::models::{
+    asset_history_inner::Action, tx_content_output_amount_inner::TxContentOutputAmountInner,
+};
+use pallas_addresses::{Network, ShelleyAddress, ShelleyDelegationPart, ShelleyPaymentPart};
+use pallas_codec::{
+    minicbor as cbor,
+    utils::{CborWrap, NonEmptyKeyValuePairs},
+};
+use pallas_primitives::{
+    conway::{
+        AssetName, DatumOption, PolicyId, PostAlonzoTransactionOutput, PseudoDatumOption,
+        ScriptRef, TransactionInput, TransactionOutput, Tx, Value,
+    },
+    PlutusScript,
+};
+use std::collections::{BTreeMap, HashMap};
+use uplc::{tx::ResolvedInput, PlutusData};
+
+use super::cardano::Cardano;
+
+pub struct Config {
+    pub project_id: String,
+}
+
+impl Config {
+    pub fn from_env(env: &HashMap<String, String>) -> Self {
+        let project_id = env
+            .get("project_id")
+            .expect("Blockfrost requires `project_id`")
+            .clone();
+        Self { project_id }
+    }
+}
+
+pub struct Blockfrost {
+    api: BlockfrostAPI,
+    base_url: String,
+    client: reqwest::Client,
+    network: Network,
+    project_id: String,
+}
+
+const UNIT_LOVELACE: &str = "lovelace";
+
+const MAINNET_PREFIX: &str = "mainnet";
+const PREPROD_PREFIX: &str = "preprod";
+const PREVIEW_PREFIX: &str = "preview";
+
+#[derive(Debug)]
+pub struct ProtocolParameters {
+    pub collateral_percent: f64,
+    pub cost_model_v3: Vec<i64>,
+    pub drep_deposit: u64,
+    pub fee_constant: u64,
+    pub fee_coefficient: u64,
+    pub min_utxo_deposit_coefficient: u64,
+    pub price_mem: f64,
+    pub price_steps: f64,
+}
+
+impl From<&ProtocolParameters> for BuildParams {
+    fn from(params: &ProtocolParameters) -> BuildParams {
+        BuildParams {
+            fee_constant: params.fee_constant,
+            fee_coefficient: params.fee_coefficient,
+            price_mem: params.price_mem,
+            price_steps: params.price_steps,
+        }
+    }
+}
+
+impl Blockfrost {
+    pub fn new(project_id: String) -> Self {
+        let network_prefix = if project_id.starts_with(MAINNET_PREFIX) {
+            MAINNET_PREFIX.to_string()
+        } else if project_id.starts_with(PREPROD_PREFIX) {
+            PREPROD_PREFIX.to_string()
+        } else if project_id.starts_with(PREVIEW_PREFIX) {
+            PREVIEW_PREFIX.to_string()
+        } else {
+            panic!("unexpected project id prefix")
+        };
+        let base_url = format!("https://cardano-{}.blockfrost.io/api/v0", network_prefix,);
+        let api = BlockfrostAPI::new(project_id.as_str(), Default::default());
+        Self {
+            api,
+            base_url,
+            client: reqwest::Client::new(),
+            network: if project_id.starts_with(MAINNET_PREFIX) {
+                Network::Mainnet
+            } else {
+                Network::Testnet
+            },
+            project_id,
+        }
+    }
+
+    pub async fn minting(&self, policy_id: &PolicyId, asset_name: &AssetName) -> Vec<Tx> {
+        let history = self
+            .api
+            .assets_history(
+                &format!("{}{}", hex::encode(policy_id), hex::encode(&asset_name[..])),
+                Pagination::all(),
+            )
+            .await
+            .ok()
+            .unwrap_or(vec![])
+            .into_iter()
+            .filter_map(|inner| {
+                if matches!(inner.action, Action::Minted) {
+                    Some(inner.tx_hash)
+                } else {
+                    None
+                }
+            })
+            .collect::<Vec<_>>();
+
+        let mut txs: Vec<Tx> = vec![];
+        for tx_hash in history {
+            if let Ok(tx) = self.transaction_by_hash(&tx_hash).await {
+                txs.push(tx)
+            }
+        }
+        txs
+    }
+
+    pub async fn plutus_data_from_hash(&self, datum_hash: &str) -> Result<PlutusData> {
+        let x = self.api.scripts_datum_hash_cbor(datum_hash).await?;
+        let data = x
+            .as_object()
+            .expect("Expect an object")
+            .get("cbor")
+            .expect("Expect key `cbor`")
+            .as_str()
+            .expect("Expect value to be string");
+        plutus_data_from_inline(&data)
+    }
+
+    pub async fn resolve_datum_option(
+        &self,
+        datum_hash: &Option<String>,
+        inline_datum: &Option<String>,
+    ) -> Result<Option<DatumOption>> {
+        if let Some(inline_datum) = inline_datum {
+            Ok(Some(PseudoDatumOption::Data(CborWrap(
+                plutus_data_from_inline(inline_datum)?,
+            ))))
+        } else {
+            if let Some(datum_hash) = datum_hash {
+                Ok(Some(PseudoDatumOption::Data(CborWrap(
+                    self.plutus_data_from_hash(&datum_hash).await?,
+                ))))
+            } else {
+                Ok(None)
+            }
+        }
+    }
+
+    /// Blockfrost client has the wrong type.
+    pub async fn scripts_hash_cbor(&self, script_hash: &str) -> Result<Vec<u8>> {
+        let response = self
+            .client
+            .get(&format!("{}/scripts/{}", self.base_url, script_hash))
+            .header("Accept", "application/json")
+            .header("project_id", self.project_id.as_str())
+            .send()
+            .await
+            .unwrap();
+
+        match response.status() {
+            reqwest::StatusCode::OK => {
+                let ResponseCbor { cbor } = response.json::<ResponseCbor>().await.unwrap();
+                let bytes = hex::decode(cbor)?;
+                Ok(bytes)
+            }
+            _ => Err(anyhow!("No script found")),
+        }
+    }
+
+    // /// Blockfrost client has incomplete type
+    // pub async fn script_type(&self, script_hash : &str) -> Result<PlutusVersion>{
+    //     let response = self
+    //         .client
+    //         .get(&format!( "{}/scripts/{}/cbor", self.base_url, script_hash))
+    //         .header("Accept", "application/json")
+    //         .header("project_id", self.project_id.as_str())
+    //         .send()
+    //         .await
+    //         .unwrap();
+
+    //     match response.status() {
+    //         reqwest::StatusCode::OK => {
+    //             let ResponseScript { plutus_type,.. } = response.json::<ResponseScript>().await.unwrap();
+    //         }
+    //         _ => Err(anyhow!("No script found")),
+    //     }
+    // }
+}
+
+pub fn plutus_data_from_inline(inline_datum: &str) -> Result<PlutusData> {
+    Ok(decode(&hex::decode(inline_datum)?)?)
+}
+
+impl Cardano for Blockfrost {
+    fn network_id(&self) -> Network {
+        self.network
+    }
+
+    async fn build_parameters(&self) -> BuildParams {
+        let params = self
+            .api
+            .epochs_latest_parameters()
+            .await
+            .expect("failed to fetch protocol parameters");
+
+        let pp = ProtocolParameters {
+            collateral_percent: (params
+                .collateral_percent
+                .expect("protocol parameters are missing collateral percent")
+                as f64)
+                / 1e2,
+            // NOTE: Blockfrost returns cost models out of order. They must be ordered by their
+            // "ParamName" according to how Plutus defines it, but they are usually found ordered
+            // by ascending keys, unfortunately. Given that they are unlikely to change anytime
+            // soon, I am going to bundle them as-is.
+            cost_model_v3: vec![
+                100788, 420, 1, 1, 1000, 173, 0, 1, 1000, 59957, 4, 1, 11183, 32, 201305, 8356, 4,
+                16000, 100, 16000, 100, 16000, 100, 16000, 100, 16000, 100, 16000, 100, 100, 100,
+                16000, 100, 94375, 32, 132994, 32, 61462, 4, 72010, 178, 0, 1, 22151, 32, 91189,
+                769, 4, 2, 85848, 123203, 7305, -900, 1716, 549, 57, 85848, 0, 1, 1, 1000, 42921,
+                4, 2, 24548, 29498, 38, 1, 898148, 27279, 1, 51775, 558, 1, 39184, 1000, 60594, 1,
+                141895, 32, 83150, 32, 15299, 32, 76049, 1, 13169, 4, 22100, 10, 28999, 74, 1,
+                28999, 74, 1, 43285, 552, 1, 44749, 541, 1, 33852, 32, 68246, 32, 72362, 32, 7243,
+                32, 7391, 32, 11546, 32, 85848, 123203, 7305, -900, 1716, 549, 57, 85848, 0, 1,
+                90434, 519, 0, 1, 74433, 32, 85848, 123203, 7305, -900, 1716, 549, 57, 85848, 0, 1,
+                1, 85848, 123203, 7305, -900, 1716, 549, 57, 85848, 0, 1, 955506, 213312, 0, 2,
+                270652, 22588, 4, 1457325, 64566, 4, 20467, 1, 4, 0, 141992, 32, 100788, 420, 1, 1,
+                81663, 32, 59498, 32, 20142, 32, 24588, 32, 20744, 32, 25933, 32, 24623, 32,
+                43053543, 10, 53384111, 14333, 10, 43574283, 26308, 10, 16000, 100, 16000, 100,
+                962335, 18, 2780678, 6, 442008, 1, 52538055, 3756, 18, 267929, 18, 76433006, 8868,
+                18, 52948122, 18, 1995836, 36, 3227919, 12, 901022, 1, 166917843, 4307, 36, 284546,
+                36, 158221314, 26549, 36, 74698472, 36, 333849714, 1, 254006273, 72, 2174038, 72,
+                2261318, 64571, 4, 207616, 8310, 4, 1293828, 28716, 63, 0, 1, 1006041, 43623, 251,
+                0, 1,
+            ],
+            drep_deposit: 500_000_000, // NOTE: Missing from Blockfrost
+            fee_constant: params.min_fee_b as u64,
+            fee_coefficient: params.min_fee_a as u64,
+            min_utxo_deposit_coefficient: params
+                .coins_per_utxo_size
+                .expect("protocol parameters are missing min utxo deposit coefficient")
+                .parse()
+                .unwrap(),
+            price_mem: params
+                .price_mem
+                .expect("protocol parameters are missing price mem") as f64,
+            price_steps: params
+                .price_step
+                .expect("protocol parameters are missing price step")
+                as f64,
+        };
+        (&pp).into()
+    }
+
+    async fn resolve_many(&self, inputs: Vec<TransactionInput>) -> Vec<ResolvedInput> {
+        let mut resolved = vec![];
+        for i in inputs {
+            if let Ok(r) = self.resolve(i).await {
+                resolved.push(r)
+            }
+        }
+        resolved
+    }
+
+    async fn resolve(&self, input: TransactionInput) -> Result<ResolvedInput> {
+        let utxo = self
+            .api
+            .transactions_utxos(hex::encode(input.transaction_id).as_str())
+            .await?;
+
+        if let Some(output) = utxo
+            .outputs
+            .into_iter()
+            .filter(|o| !o.collateral)
+            .nth(input.index as usize)
+        {
+            assert_eq!(
+                output.output_index, input.index as i32,
+                "somehow resolved the wrong ouput",
+            );
+            let datum_option = self
+                .resolve_datum_option(&output.data_hash, &output.inline_datum)
+                .await
+                .expect("Something went wrong");
+            // let script_ref = self.resolve_script(&output.reference_script_hash).await.expect("Something went wrong");
+
+            // FIXME!!!!
+            let script_ref = None;
+
+            Ok(ResolvedInput {
+                input: input.clone(),
+                output: TransactionOutput::PostAlonzo(PostAlonzoTransactionOutput {
+                    address: from_bech32(&output.address).into(),
+                    value: from_tx_content_output_amounts(&output.amount[..]),
+                    datum_option,
+                    script_ref,
+                }),
+            })
+        } else {
+            Err(anyhow!("No output found"))
+        }
+    }
+
+    async fn transaction_by_hash(&self, tx_hash: &str) -> Result<Tx> {
+        // NOTE: Not part of the Rust SDK somehow...
+        let response = self
+            .client
+            .get(&format!("{}/txs/{}/cbor", self.base_url, tx_hash))
+            .header("Accept", "application/json")
+            .header("project_id", self.project_id.as_str())
+            .send()
+            .await
+            .unwrap();
+
+        match response.status() {
+            reqwest::StatusCode::OK => {
+                let ResponseCbor { cbor } = response.json::<ResponseCbor>().await.unwrap();
+                let bytes = hex::decode(cbor).unwrap();
+                let tx = cbor::decode(&bytes).unwrap();
+                Ok(tx)
+            }
+            _ => Err(anyhow!("No tx found")),
+        }
+    }
+    async fn health(&self) -> Result<String, String> {
+        match self.api.health().await {
+            Ok(x) => Ok(format!("{:?}", x)),
+            Err(y) => Err(y.to_string()),
+        }
+    }
+
+    async fn utxos_at(
+        &self,
+        payment_credential: &ShelleyPaymentPart,
+    ) -> Result<Vec<ResolvedInput>> {
+        let addr = ShelleyAddress::new(
+            self.network_id(),
+            payment_credential.clone(),
+            ShelleyDelegationPart::Null,
+        );
+        let response = self
+            .api
+            .addresses_utxos(&addr.to_bech32()?, Pagination::all())
+            .await?;
+        response
+            .iter()
+            .map(|o| {
+                // FIXME: This should pull the datum and script reference
+                let datum_option = None;
+                let script_ref = None;
+                Ok(ResolvedInput {
+                    input: TransactionInput {
+                        transaction_id: v2a(hex::decode(&o.tx_hash)?)?.into(),
+                        index: o.tx_index as u64,
+                    },
+                    output: TransactionOutput::PostAlonzo(PostAlonzoTransactionOutput {
+                        address: from_bech32(&o.address).into(),
+                        value: from_tx_content_output_amounts(&o.amount[..]),
+                        datum_option,
+                        script_ref,
+                    }),
+                })
+            })
+            .collect()
+    }
+
+    async fn submit(&self, tx: Vec<u8>) -> Result<String> {
+        let tx_hash = self.api.transactions_submit(tx).await?;
+        Ok(tx_hash)
+    }
+}
+
+#[derive(serde::Serialize, serde::Deserialize, Debug)]
+struct ResponseCbor {
+    cbor: String,
+}
+
+#[derive(serde::Serialize, serde::Deserialize, Debug)]
+struct ResponseScript {
+    script_hash: String,
+    #[serde(rename = "type")]
+    plutus_type: String,
+    serialised_size: u64,
+}
+
+fn from_bech32(bech32: &str) -> Vec<u8> {
+    bech32::decode(bech32).unwrap().1
+}
+
+fn from_tx_content_output_amounts(xs: &[TxContentOutputAmountInner]) -> Value {
+    let mut lovelaces = 0;
+    let mut assets = BTreeMap::new();
+
+    for asset in xs {
+        let quantity: u64 = asset.quantity.parse().unwrap();
+        if asset.unit == UNIT_LOVELACE {
+            lovelaces += quantity;
+        } else {
+            let policy_id: PolicyId = asset.unit[0..56].parse().unwrap();
+            let asset_name: AssetName = hex::decode(&asset.unit[56..]).unwrap().into();
+            assets
+                .entry(policy_id)
+                .and_modify(|m: &mut BTreeMap<AssetName, u64>| {
+                    m.entry(asset_name.clone())
+                        .and_modify(|q| *q += quantity)
+                        .or_insert(quantity);
+                })
+                .or_insert_with(|| BTreeMap::from([(asset_name, quantity)]));
+        }
+    }
+
+    if assets.is_empty() {
+        Value::Coin(lovelaces)
+    } else {
+        Value::Multiasset(
+            lovelaces,
+            NonEmptyKeyValuePairs::Def(
+                assets
+                    .into_iter()
+                    .map(|(policy_id, policies)| {
+                        (
+                            policy_id,
+                            NonEmptyKeyValuePairs::Def(
+                                policies
+                                    .into_iter()
+                                    .map(|(asset_name, quantity)| {
+                                        (asset_name, quantity.try_into().unwrap())
+                                    })
+                                    .collect::<Vec<_>>(),
+                            ),
+                        )
+                    })
+                    .collect::<Vec<_>>(),
+            ),
+        )
+    }
+}
diff --git a/src/cardano/cardano.rs b/src/cardano/cardano.rs
new file mode 100644
index 0000000..cb44be2
--- /dev/null
+++ b/src/cardano/cardano.rs
@@ -0,0 +1,31 @@
+use anyhow::Result;
+use pallas_addresses::{Network, ShelleyPaymentPart};
+use pallas_primitives::conway::Tx;
+use uplc::{tx::ResolvedInput, TransactionInput};
+
+use crate::tx::plutus::BuildParams;
+
+pub trait Cardano {
+    fn network_id(&self) -> Network;
+    fn build_parameters(&self) -> impl std::future::Future<Output = BuildParams> + Send;
+    fn resolve_many(
+        &self,
+        inputs: Vec<TransactionInput>,
+    ) -> impl std::future::Future<Output = Vec<ResolvedInput>> + Send;
+    fn resolve(
+        &self,
+        input: TransactionInput,
+    ) -> impl std::future::Future<Output = Result<ResolvedInput>> + Send;
+    fn transaction_by_hash(
+        &self,
+        tx_hash: &str,
+    ) -> impl std::future::Future<Output = Result<Tx>> + Send;
+    /// This should return all utxos available to be spent,
+    /// ie regardelss of the staking part.
+    fn utxos_at(
+        &self,
+        payment_credential: &ShelleyPaymentPart,
+    ) -> impl std::future::Future<Output = Result<Vec<ResolvedInput>>> + Send;
+    fn health(&self) -> impl std::future::Future<Output = Result<String, String>> + Send;
+    fn submit(&self, tx: Vec<u8>) -> impl std::future::Future<Output = Result<String>> + Send;
+}
diff --git a/src/cmd.rs b/src/cmd.rs
new file mode 100644
index 0000000..5525b4a
--- /dev/null
+++ b/src/cmd.rs
@@ -0,0 +1,28 @@
+use clap::Subcommand;
+
+mod cardano;
+mod data;
+mod tx;
+mod wallet;
+
+#[derive(Subcommand)]
+pub enum Cmd {
+    /// Txs
+    #[command(subcommand)]
+    Tx(tx::Cmd),
+    #[command(subcommand)]
+    Data(data::Cmd),
+    #[command(subcommand)]
+    Cardano(cardano::Cmd),
+    #[command(subcommand)]
+    Wallet(wallet::Cmd),
+}
+
+pub fn handle(cmd: Cmd) {
+    match cmd {
+        Cmd::Tx(inner) => tx::handle(inner),
+        Cmd::Data(inner) => data::handle(inner),
+        Cmd::Cardano(inner) => cardano::handle(inner),
+        Cmd::Wallet(inner) => wallet::handle(inner),
+    };
+}
diff --git a/src/cmd/cardano.rs b/src/cmd/cardano.rs
new file mode 100644
index 0000000..bcbece8
--- /dev/null
+++ b/src/cmd/cardano.rs
@@ -0,0 +1,25 @@
+use clap::Subcommand;
+use tokio::runtime::Runtime;
+
+use crate::cardano::{cardano::Cardano, from_env};
+use crate::env::get_env;
+
+#[derive(Subcommand)]
+/// Cardano api
+pub enum Cmd {
+    /// Health
+    Health,
+}
+
+pub fn handle(cmd: Cmd) {
+    match cmd {
+        Cmd::Health => {
+            let env = get_env();
+            let conn = from_env(&env);
+            let rt = Runtime::new().expect("Failed to create Tokio runtime");
+            rt.block_on(async {
+                println!("{:?}", conn.health().await);
+            })
+        }
+    };
+}
diff --git a/src/cmd/data.rs b/src/cmd/data.rs
new file mode 100644
index 0000000..9e19447
--- /dev/null
+++ b/src/cmd/data.rs
@@ -0,0 +1,47 @@
+use clap::Subcommand;
+
+use crate::data::{
+    base::{Amount, Hash28, Tag, TimeDelta, VKey},
+    constants::Constants,
+    datum::Datum,
+    plutus::to_cbor,
+    stage::Stage,
+};
+
+#[derive(Subcommand)]
+/// Data
+pub enum Cmd {
+    /// Make an example (serialised) datum
+    Datum,
+    /// other
+    Other,
+}
+
+pub fn handle(cmd: Cmd) {
+    match cmd {
+        Cmd::Datum => handle_datum(),
+        _ => println!("Not yet implemented"),
+    };
+}
+
+fn handle_datum() {
+    let own_hash = Hash28([0; 28]);
+    let tag = Tag([1; 8].to_vec());
+    let add_vkey = VKey([2; 32]);
+    let sub_vkey = VKey([3; 32]);
+    let close_period = TimeDelta(86_400_000);
+    let constants = Constants {
+        tag,
+        add_vkey,
+        sub_vkey,
+        close_period,
+    };
+    let subbed = Amount(0x4444444444);
+    let stage = Stage::Opened(subbed);
+    let datum = Datum {
+        own_hash,
+        constants,
+        stage,
+    };
+    println!("{}", hex::encode(to_cbor(&datum).unwrap()))
+}
diff --git a/src/cmd/tx.rs b/src/cmd/tx.rs
new file mode 100644
index 0000000..40815f3
--- /dev/null
+++ b/src/cmd/tx.rs
@@ -0,0 +1,28 @@
+use clap::Subcommand;
+
+mod open;
+mod send;
+
+#[derive(Subcommand)]
+/// Txs
+pub enum Cmd {
+    /// Send
+    Send(send::Params),
+    /// Open
+    Open(open::Params),
+    /// Add
+    Add,
+    /// Sub
+    Sub,
+    /// Close
+    Close,
+}
+
+pub fn handle(cmd: Cmd) {
+    match cmd {
+        Cmd::Open(params) => open::handle(params),
+        Cmd::Send(params) => send::handle(params),
+        Cmd::Close => println!("Do Close"),
+        _ => todo!(),
+    };
+}
diff --git a/src/cmd/tx/open.rs b/src/cmd/tx/open.rs
new file mode 100644
index 0000000..6bf44b1
--- /dev/null
+++ b/src/cmd/tx/open.rs
@@ -0,0 +1,21 @@
+use clap::Args;
+
+#[derive(Debug, Args)]
+pub struct Params {
+    /// The channel tag
+    #[arg(long, default_value = "hello")]
+    tag: String,
+    /// The adaptors vkey
+    #[arg(long, default_value = "")]
+    adaptor: String,
+    /// Amount (in ada) to put in the channel
+    #[arg(long, default_value = "10")]
+    amount: usize,
+    /// Minimum time (in milliseconds) from `close` to `elapse`
+    #[arg(long, default_value = "86_400_000")]
+    close_period: usize,
+}
+
+pub fn handle(params: Params) {
+    println!("{:?}", params);
+}
diff --git a/src/cmd/tx/send.rs b/src/cmd/tx/send.rs
new file mode 100644
index 0000000..82db60e
--- /dev/null
+++ b/src/cmd/tx/send.rs
@@ -0,0 +1,40 @@
+use clap::Args;
+use pallas_addresses::Address;
+use tokio::runtime::Runtime;
+
+use crate::{
+    cardano::cardano::Cardano,
+    env::get_env,
+    tx::{
+        context::TxContext,
+        from_env,
+        send::{self, send},
+    },
+};
+
+#[derive(Debug, Args)]
+pub struct Params {
+    /// `<who>:<amount>` It can be used multiple times
+    #[arg(long)]
+    to: Vec<String>,
+}
+
+pub fn handle(params: Params) {
+    let outputs = params
+        .to
+        .iter()
+        .map(|x| parse_to(x))
+        .collect::<Vec<(Address, u64)>>();
+    let env = get_env();
+    let tx_ctx = from_env(&env);
+    let rt = Runtime::new().expect("Failed to create Tokio runtime");
+    let tx = rt.block_on(async { send(tx_ctx, vec![]).await });
+    println!("{:?}", tx);
+}
+
+pub fn parse_to(to: &str) -> (Address, u64) {
+    let (a, b) = to.split_once(":").expect("Expect `<who>:<amount>`");
+    let addr = Address::from_bech32(a).expect("Cannot parse address");
+    let amount = b.parse::<u64>().expect("Cannot parse amount");
+    (addr, amount)
+}
diff --git a/src/cmd/wallet.rs b/src/cmd/wallet.rs
new file mode 100644
index 0000000..3d95419
--- /dev/null
+++ b/src/cmd/wallet.rs
@@ -0,0 +1,59 @@
+use clap::Subcommand;
+use pallas_addresses::{
+    Address, Network, ShelleyAddress, ShelleyDelegationPart, ShelleyPaymentPart,
+};
+use tokio::runtime::Runtime;
+
+use crate::cardano;
+use crate::cardano::cardano::Cardano;
+use crate::env::get_env;
+use crate::wallet::{from_env, generate, Wallet};
+
+#[derive(Subcommand)]
+/// Wallet Api
+pub enum Cmd {
+    /// Gen new skey
+    Gen,
+    /// Show
+    Show,
+    /// Utxos at address. Requires `Cardano` connection.
+    Utxos,
+}
+
+pub fn handle(cmd: Cmd) {
+    match cmd {
+        Cmd::Gen => {
+            println!("KONDUIT_WALLET_KEY={}", hex::encode(generate()));
+        }
+        Cmd::Show => {
+            let env = get_env();
+            let w = from_env(&env);
+            let payment_cred = ShelleyPaymentPart::Key(w.key_hash());
+            let stake_cred = ShelleyDelegationPart::Null;
+            let addr_main =
+                ShelleyAddress::new(Network::Mainnet, payment_cred.clone(), stake_cred.clone());
+            let addr_test =
+                ShelleyAddress::new(Network::Testnet, payment_cred.clone(), stake_cred.clone());
+            println!("VKEY={}", hex::encode(w.vkey()));
+            println!("PAYMENT_CRED={:?}", payment_cred.to_bech32());
+            println!("ADDRESS_MAINNET={:?}", addr_main.to_bech32());
+            println!("ADDRESS_TESTNET={:?}", addr_test.to_bech32());
+        }
+        Cmd::Utxos => {
+            let env = get_env();
+            let w = from_env(&env);
+            let payment_cred = w.payment_credential();
+            let stake_cred = ShelleyDelegationPart::Null;
+            let conn = cardano::from_env(&env);
+            let rt = Runtime::new().expect("Failed to create Tokio runtime");
+            rt.block_on(async {
+                let addr = ShelleyAddress::new(
+                    conn.network_id(),
+                    payment_cred.clone(),
+                    stake_cred.clone(),
+                );
+                println!("{:?}", conn.utxos_at(&w.payment_credential()).await);
+            })
+        }
+    };
+}
diff --git a/src/data.rs b/src/data.rs
new file mode 100644
index 0000000..8e27944
--- /dev/null
+++ b/src/data.rs
@@ -0,0 +1,12 @@
+pub mod base;
+pub mod cheque_body;
+pub mod constants;
+pub mod datum;
+pub mod mix;
+pub mod pend_cheque;
+pub mod plutus;
+pub mod redeemer;
+pub mod squash;
+pub mod stage;
+pub mod step;
+pub mod unlocked;
diff --git a/src/env.rs b/src/env.rs
new file mode 100644
index 0000000..7899c19
--- /dev/null
+++ b/src/env.rs
@@ -0,0 +1,16 @@
+use std::collections::HashMap;
+
+/// Used for variables that are roughly constant per "instance"
+/// These include signing keys and cardano connection
+
+const PREFIX: &str = "KONDUIT_";
+
+pub fn get_env() -> HashMap<String, String> {
+    let mut env = HashMap::new();
+    for (key, value) in std::env::vars() {
+        if let Some(key) = key.strip_prefix(PREFIX) {
+            env.insert(key.to_lowercase(), value);
+        };
+    }
+    env
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..9e569eb
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,8 @@
+pub mod cardano;
+pub mod cmd;
+pub mod data;
+pub mod env;
+pub mod pallas_extra;
+pub mod tx;
+pub mod utils;
+pub mod wallet;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..addeedf
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,18 @@
+use clap::Parser;
+
+use kon_gen::cmd;
+
+#[derive(Parser)]
+#[command(arg_required_else_help(true), version, about)]
+struct Args {
+    #[command(subcommand)]
+    cmd: Option<cmd::Cmd>,
+}
+
+fn main() {
+    let args = Args::parse();
+    match args.cmd {
+        Some(cmd) => cmd::handle(cmd),
+        None => println!("See help"),
+    };
+}
diff --git a/src/pallas_extra.rs b/src/pallas_extra.rs
new file mode 100644
index 0000000..c047b57
--- /dev/null
+++ b/src/pallas_extra.rs
@@ -0,0 +1,397 @@
+//  This Source Code Form is subject to the terms of the Mozilla Public
+//  License, v. 2.0. If a copy of the MPL was not distributed with this
+//  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// SOURCE : github.com/cardanoSolutions/zhuli
+
+use pallas_addresses::{Network, ShelleyAddress, ShelleyDelegationPart, ShelleyPaymentPart};
+use pallas_codec::{
+    minicbor as cbor,
+    utils::{NonEmptyKeyValuePairs, NonEmptySet, Set},
+};
+use pallas_crypto::hash::{Hash, Hasher};
+use pallas_primitives::{
+    conway::{
+        AssetName, Constr, ExUnits, Language, Multiasset, NetworkId, PlutusData,
+        PostAlonzoTransactionOutput, PseudoTransactionOutput, RedeemerTag, RedeemersKey,
+        RedeemersValue, TransactionBody, TransactionInput, TransactionOutput, Tx, Value,
+        WitnessSet,
+    },
+    MaybeIndefArray,
+};
+use std::{cmp::Ordering, str::FromStr};
+use uplc::tx::{eval_phase_two, ResolvedInput, SlotConfig};
+
+#[derive(Debug)]
+pub struct BuildParams {
+    pub fee_constant: u64,
+    pub fee_coefficient: u64,
+    pub price_mem: f64,
+    pub price_steps: f64,
+}
+
+pub struct OutputReference(pub TransactionInput);
+
+impl FromStr for OutputReference {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match &s.split('#').collect::<Vec<_>>()[..] {
+            [tx_id_str, ix_str] => {
+                let transaction_id: Hash<32> = tx_id_str
+                    .parse()
+                    .map_err(|e| format!("failed to decode transaction id from hex: {e:?}"))?;
+                let index: u64 = ix_str
+                    .parse()
+                    .map_err(|e| format!("failed to decode output index: {e:?}"))?;
+                Ok(OutputReference(TransactionInput {
+                    transaction_id,
+                    index,
+                }))
+            }
+            _ => Err("malformed output reference: expected a hex-encode string and an index separated by '#'".to_string()),
+        }
+    }
+}
+
+pub struct Redeemer {}
+
+impl Redeemer {
+    pub fn mint(index: u32, data: PlutusData, ex_units: ExUnits) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Mint,
+                index,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+
+    pub fn spend(
+        (inputs, target): (&[TransactionInput], &TransactionInput),
+        data: PlutusData,
+        ex_units: ExUnits,
+    ) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Spend,
+                index: inputs
+                    .iter()
+                    .enumerate()
+                    .find(|(_, i)| *i == target)
+                    .unwrap()
+                    .0 as u32,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+
+    pub fn publish(
+        index: u32,
+        data: PlutusData,
+        ex_units: ExUnits,
+    ) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Cert,
+                index,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+
+    pub fn vote(index: u32, data: PlutusData, ex_units: ExUnits) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Vote,
+                index,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+}
+
+pub fn void() -> PlutusData {
+    PlutusData::Constr(Constr {
+        tag: 121,
+        any_constructor: None,
+        fields: MaybeIndefArray::Indef(vec![]),
+    })
+}
+
+pub fn from_network(network: Network) -> NetworkId {
+    match network {
+        Network::Mainnet => NetworkId::Mainnet,
+        _ => NetworkId::Testnet,
+    }
+}
+
+pub fn non_empty_set<T>(set: Vec<T>) -> Option<NonEmptySet<T>>
+where
+    T: std::fmt::Debug,
+{
+    if set.is_empty() {
+        None
+    } else {
+        Some(NonEmptySet::try_from(set).unwrap())
+    }
+}
+
+pub fn non_empty_pairs<K, V>(pairs: Vec<(K, V)>) -> Option<NonEmptyKeyValuePairs<K, V>>
+where
+    V: Clone,
+    K: Clone,
+{
+    if pairs.is_empty() {
+        None
+    } else {
+        Some(NonEmptyKeyValuePairs::Def(pairs))
+    }
+}
+
+pub fn into_outputs(outputs: Vec<PostAlonzoTransactionOutput>) -> Vec<TransactionOutput> {
+    outputs
+        .into_iter()
+        .map(PseudoTransactionOutput::PostAlonzo)
+        .collect()
+}
+
+pub fn singleton_assets<T: Clone>(
+    validator_hash: Hash<28>,
+    assets: &[(AssetName, T)],
+) -> Multiasset<T> {
+    NonEmptyKeyValuePairs::Def(vec![(
+        validator_hash,
+        NonEmptyKeyValuePairs::Def(assets.to_vec()),
+    )])
+}
+
+pub fn from_validator(validator: &[u8], network_id: Network) -> (Hash<28>, ShelleyAddress) {
+    let validator_hash = Hasher::<224>::hash_tagged(validator, 3);
+    let validator_address = ShelleyAddress::new(
+        network_id,
+        ShelleyPaymentPart::script_hash(validator_hash),
+        ShelleyDelegationPart::script_hash(validator_hash),
+    );
+
+    (validator_hash, validator_address)
+}
+
+pub fn value_subtract_lovelace(value: Value, lovelace: u64) -> Option<Value> {
+    match value {
+        Value::Coin(total) if total > lovelace => Some(Value::Coin(total - lovelace)),
+        Value::Multiasset(total, assets) if total > lovelace => {
+            Some(Value::Multiasset(total - lovelace, assets))
+        }
+        _ => None,
+    }
+}
+
+pub fn value_add_lovelace(value: Value, lovelace: u64) -> Value {
+    match value {
+        Value::Coin(total) => Value::Coin(total + lovelace),
+        Value::Multiasset(total, assets) => Value::Multiasset(total + lovelace, assets),
+    }
+}
+
+pub fn lovelace_of(value: &Value) -> u64 {
+    match value {
+        Value::Coin(lovelace) | Value::Multiasset(lovelace, _) => *lovelace,
+    }
+}
+
+pub fn new_min_value_output<F>(per_byte: u64, build: F) -> PostAlonzoTransactionOutput
+where
+    F: Fn(u64) -> PostAlonzoTransactionOutput,
+{
+    let value = build(1);
+    let mut buffer: Vec<u8> = Vec::new();
+    cbor::encode(&value, &mut buffer).unwrap();
+    // NOTE: 160 overhead as per the spec + 4 bytes for actual final lovelace value.
+    // Technically, the final value could need 8 more additional bytes if the resulting
+    // value was larger than 4_294_967_295 lovelaces, which would realistically never be
+    // the case.
+    build((buffer.len() as u64 + 164) * per_byte)
+}
+
+pub fn total_execution_cost(params: &BuildParams, redeemers: &[ExUnits]) -> u64 {
+    redeemers.iter().fold(0, |acc, ex_units| {
+        acc + ((params.price_mem * ex_units.mem as f64).ceil() as u64)
+            + ((params.price_steps * ex_units.steps as f64).ceil() as u64)
+    })
+}
+
+pub fn script_integrity_hash(
+    redeemers: Option<&NonEmptyKeyValuePairs<RedeemersKey, RedeemersValue>>,
+    datums: Option<&NonEmptyKeyValuePairs<Hash<32>, PlutusData>>,
+    language_views: &[(Language, &[i64])],
+) -> Option<Hash<32>> {
+    if redeemers.is_none() && language_views.is_empty() && datums.is_none() {
+        return None;
+    }
+
+    let mut preimage: Vec<u8> = Vec::new();
+    if let Some(redeemers) = redeemers {
+        cbor::encode(redeemers, &mut preimage).unwrap();
+    }
+
+    if let Some(datums) = datums {
+        cbor::encode(datums, &mut preimage).unwrap();
+    }
+
+    // NOTE: This doesn't work for PlutusV1, but I don't care.
+    if !language_views.is_empty() {
+        let mut views = language_views.to_vec();
+        // TODO: Derive an Ord instance in Pallas.
+        views.sort_by(|(a, _), (b, _)| match (a, b) {
+            (Language::PlutusV3, Language::PlutusV3) => Ordering::Equal,
+            (Language::PlutusV3, _) => Ordering::Greater,
+            (_, Language::PlutusV3) => Ordering::Less,
+
+            (Language::PlutusV2, Language::PlutusV2) => Ordering::Equal,
+            (Language::PlutusV2, _) => Ordering::Greater,
+            (_, Language::PlutusV2) => Ordering::Less,
+
+            (Language::PlutusV1, Language::PlutusV1) => Ordering::Equal,
+        });
+        cbor::encode(NonEmptyKeyValuePairs::Def(views), &mut preimage).unwrap()
+    }
+
+    Some(Hasher::<256>::hash(&preimage))
+}
+
+pub fn default_transaction_body() -> TransactionBody {
+    TransactionBody {
+        auxiliary_data_hash: None,
+        certificates: None,
+        collateral: None,
+        collateral_return: None,
+        donation: None,
+        fee: 0,
+        inputs: Set::from(vec![]),
+        mint: None,
+        network_id: None,
+        outputs: vec![],
+        proposal_procedures: None,
+        reference_inputs: None,
+        required_signers: None,
+        script_data_hash: None,
+        total_collateral: None,
+        treasury_value: None,
+        ttl: None,
+        validity_interval_start: None,
+        voting_procedures: None,
+        withdrawals: None,
+    }
+}
+
+pub fn default_witness_set() -> WitnessSet {
+    WitnessSet {
+        bootstrap_witness: None,
+        native_script: None,
+        plutus_data: None,
+        plutus_v1_script: None,
+        plutus_v2_script: None,
+        plutus_v3_script: None,
+        redeemer: None,
+        vkeywitness: None,
+    }
+}
+
+// Build a transaction by repeatedly executing some building logic with different fee and execution
+// units settings. Stops when a fixed point is reached. The final transaction has corresponding
+// fees and execution units.
+pub fn build_transaction<F>(params: &BuildParams, resolved_inputs: &[ResolvedInput], with: F) -> Tx
+where
+    F: Fn(u64, &[ExUnits]) -> Tx,
+{
+    let empty_ex_units = || {
+        vec![
+            ExUnits { mem: 0, steps: 0 },
+            ExUnits { mem: 0, steps: 0 },
+            ExUnits { mem: 0, steps: 0 },
+            ExUnits { mem: 0, steps: 0 },
+        ]
+    };
+
+    let mut fee = 0;
+    let mut ex_units = empty_ex_units();
+    let mut tx;
+    let mut attempts = 0;
+    loop {
+        tx = with(fee, &ex_units[..]);
+
+        // Convert to minted_tx...
+        let mut serialized_tx = Vec::new();
+        cbor::encode(&tx, &mut serialized_tx).unwrap();
+
+        let mut calculated_ex_units = if resolved_inputs.is_empty() {
+            empty_ex_units()
+        } else {
+            // Compute execution units
+            let minted_tx = cbor::decode(&serialized_tx).unwrap();
+            eval_phase_two(
+                &minted_tx,
+                resolved_inputs,
+                None,
+                None,
+                &SlotConfig::default(),
+                false,
+                |_| (),
+            )
+            .expect("script evaluation failed")
+            .into_iter()
+            .map(|r| r.0.ex_units)
+            .collect::<Vec<_>>()
+        };
+
+        calculated_ex_units.extend(empty_ex_units());
+
+        attempts += 1;
+
+        let estimated_fee = {
+            // NOTE: This is a best effort to estimate the number of signatories since signatures
+            // will add an overhead to the fee. Yet, if inputs are locked by native scripts each
+            // requiring multiple signatories, this will unfortunately fall short.
+            //
+            // For similar reasons, it will also over-estimate fees by a small margin for every
+            // script-locked inputs that do not require signatories.
+            //
+            // This is however *acceptable* in our context.
+            let num_signatories = tx.transaction_body.inputs.len()
+                + tx.transaction_body
+                    .required_signers
+                    .as_ref()
+                    .map(|xs| xs.len())
+                    .unwrap_or(0);
+
+            params.fee_constant
+                + params.fee_coefficient
+                    * (5 + ex_units.len() * 16 + num_signatories * 102 + serialized_tx.len()) as u64
+                + total_execution_cost(params, &ex_units)
+        };
+
+        // Check if we've reached a fixed point, or start over.
+        if fee >= estimated_fee
+            && calculated_ex_units
+                .iter()
+                .zip(ex_units)
+                .all(|(l, r)| l.eq(&r))
+        {
+            break;
+        } else if attempts >= 3 {
+            panic!("failed to build transaction: did not converge after three attempts.");
+        } else {
+            ex_units = calculated_ex_units;
+            fee = estimated_fee;
+        }
+    }
+    tx
+}
+
+pub fn expect_post_alonzo(output: &TransactionOutput) -> &PostAlonzoTransactionOutput {
+    if let TransactionOutput::PostAlonzo(ref o) = output {
+        o
+    } else {
+        panic!("expected PostAlonzo output but got a legacy one.")
+    }
+}
diff --git a/src/tx.rs b/src/tx.rs
new file mode 100644
index 0000000..f043650
--- /dev/null
+++ b/src/tx.rs
@@ -0,0 +1,18 @@
+use std::collections::HashMap;
+
+use crate::cardano;
+use crate::cardano::cardano::Cardano;
+use crate::wallet;
+
+pub mod context;
+mod open;
+pub mod plutus;
+pub mod send;
+mod torso;
+
+pub fn from_env(env: &HashMap<String, String>) -> context::TxContext<impl Cardano> {
+    context::TxContext {
+        cardano: cardano::from_env(env),
+        wallet: wallet::from_env(env),
+    }
+}
diff --git a/src/tx/context.rs b/src/tx/context.rs
new file mode 100644
index 0000000..95add0b
--- /dev/null
+++ b/src/tx/context.rs
@@ -0,0 +1,31 @@
+use crate::{cardano::cardano::Cardano, wallet::Wallet};
+use anyhow::Result;
+use pallas_addresses::{ShelleyAddress, ShelleyDelegationPart};
+use uplc::tx::ResolvedInput;
+
+use super::plutus::BuildParams;
+
+pub struct TxContext<CardanoT> {
+    pub cardano: CardanoT,
+    pub wallet: Wallet,
+}
+
+impl<T: Cardano> TxContext<T> {
+    pub async fn build_parameters(&self) -> BuildParams {
+        self.cardano.build_parameters().await
+    }
+
+    pub async fn available_utxos(&self) -> Result<Vec<ResolvedInput>> {
+        self.cardano
+            .utxos_at(&self.wallet.payment_credential())
+            .await
+    }
+
+    pub fn wallet_address(&self) -> ShelleyAddress {
+        ShelleyAddress::new(
+            self.cardano.network_id(),
+            self.wallet.payment_credential(),
+            ShelleyDelegationPart::Null,
+        )
+    }
+}
diff --git a/src/tx/open.rs b/src/tx/open.rs
new file mode 100644
index 0000000..b248d21
--- /dev/null
+++ b/src/tx/open.rs
@@ -0,0 +1,105 @@
+// pub struct Instance {
+//     cardano: Cardano,
+//     contract_reference : OutputReference,
+//     wallet_key: SigningKey,
+// }
+
+// pub async fn open(
+//     instance
+//     network: Cardano,
+//     delegates: Vec<Hash<28>>,
+//     choice: Vote,
+//     anchor: Option<Anchor>,
+//     proposal_id: GovActionId,
+//     OutputReference(contract): OutputReference,
+//     OutputReference(collateral): OutputReference,
+// ) -> Tx {
+//     let (validator, validator_hash, _) =
+//         recover_validator(&network, &contract.transaction_id).await;
+//
+//     let params = network.protocol_parameters().await;
+//
+//     let resolved_inputs = network.resolve_many(&[&collateral, &contract]).await;
+//     let fuel_output = expect_post_alonzo(&resolved_inputs[0].output);
+//     let contract_output = expect_post_alonzo(&resolved_inputs[1].output);
+//
+//     let (rules, _) = recover_rules(&network, &validator_hash, &contract_output.value).await;
+//
+//     build_transaction(
+//         &BuildParams::from(&params),
+//         &resolved_inputs[..],
+//         |fee, ex_units| {
+//             let mut redeemers = vec![];
+//
+//             let inputs = vec![collateral.clone()];
+//
+//             let reference_inputs = vec![contract.clone()];
+//
+//             let outputs = vec![
+//                 // Change
+//                 PostAlonzoTransactionOutput {
+//                     address: fuel_output.address.clone(),
+//                     value: value_subtract_lovelace(fuel_output.value.clone(), fee)
+//                         .expect("not enough fuel"),
+//                     datum_option: None,
+//                     script_ref: None,
+//                 },
+//             ];
+//
+//             let total_collateral = (fee as f64 * params.collateral_percent).ceil() as u64;
+//
+//             let collateral_return = PostAlonzoTransactionOutput {
+//                 address: fuel_output.address.clone(),
+//                 value: value_subtract_lovelace(fuel_output.value.clone(), total_collateral)
+//                     .expect("not enough fuel"),
+//                 datum_option: None,
+//                 script_ref: None,
+//             };
+//
+//             let votes = vec![(
+//                 Voter::DRepScript(validator_hash),
+//                 NonEmptyKeyValuePairs::Def(vec![(
+//                     proposal_id.clone(),
+//                     VotingProcedure {
+//                         vote: choice.clone(),
+//                         anchor: anchor.clone().map(Nullable::Some).unwrap_or(Nullable::Null),
+//                     },
+//                 )]),
+//             )];
+//             redeemers.push(Redeemer::vote(0, rules.clone(), ex_units[0]));
+//
+//             // ----- Put it all together
+//             let redeemers = non_empty_pairs(redeemers).unwrap();
+//             Tx {
+//                 transaction_body: TransactionBody {
+//                     inputs: Set::from(inputs),
+//                     reference_inputs: non_empty_set(reference_inputs),
+//                     network_id: Some(from_network(network.network_id())),
+//                     outputs: into_outputs(outputs),
+//                     voting_procedures: non_empty_pairs(votes),
+//                     fee,
+//                     collateral: non_empty_set(vec![fuel.clone()]),
+//                     collateral_return: Some(PseudoTransactionOutput::PostAlonzo(collateral_return)),
+//                     total_collateral: Some(total_collateral),
+//                     required_signers: non_empty_set(delegates.clone()),
+//                     script_data_hash: Some(
+//                         script_integrity_hash(
+//                             Some(&redeemers),
+//                             None,
+//                             &[(Language::PlutusV3, &params.cost_model_v3[..])],
+//                         )
+//                         .unwrap(),
+//                     ),
+//                     ..default_transaction_body()
+//                 },
+//                 transaction_witness_set: WitnessSet {
+//                     redeemer: Some(redeemers.into()),
+//                     plutus_v3_script: non_empty_set(vec![PlutusScript::<3>(validator.clone())]),
+//                     ..default_witness_set()
+//                 },
+//                 success: true,
+//                 auxiliary_data: Nullable::Null,
+//             }
+//         },
+//     )
+// }
diff --git a/src/tx/plutus.rs b/src/tx/plutus.rs
new file mode 100644
index 0000000..9e73b17
--- /dev/null
+++ b/src/tx/plutus.rs
@@ -0,0 +1,399 @@
+//  This Source Code Form is subject to the terms of the Mozilla Public
+//  License, v. 2.0. If a copy of the MPL was not distributed with this
+//  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// SOURCE : github.com/cardanoSolutions/zhuli
+
+use pallas_addresses::{Network, ShelleyAddress, ShelleyDelegationPart, ShelleyPaymentPart};
+use pallas_codec::{
+    minicbor as cbor,
+    utils::{NonEmptyKeyValuePairs, NonEmptySet, Set},
+};
+use pallas_crypto::hash::{Hash, Hasher};
+use pallas_primitives::{
+    conway::{
+        AssetName, Constr, ExUnits, Language, Multiasset, NetworkId, PlutusData,
+        PostAlonzoTransactionOutput, PseudoTransactionOutput, RedeemerTag, RedeemersKey,
+        RedeemersValue, TransactionBody, TransactionInput, TransactionOutput, Tx, Value,
+        WitnessSet,
+    },
+    MaybeIndefArray,
+};
+use std::{cmp::Ordering, str::FromStr};
+use uplc::tx::{eval_phase_two, ResolvedInput, SlotConfig};
+
+#[derive(Debug)]
+pub struct BuildParams {
+    pub fee_constant: u64,
+    pub fee_coefficient: u64,
+    pub price_mem: f64,
+    pub price_steps: f64,
+}
+
+pub struct OutputReference(pub TransactionInput);
+
+impl FromStr for OutputReference {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match &s.split('#').collect::<Vec<_>>()[..] {
+            [tx_id_str, ix_str] => {
+                let transaction_id: Hash<32> = tx_id_str
+                    .parse()
+                    .map_err(|e| format!("failed to decode transaction id from hex: {e:?}"))?;
+                let index: u64 = ix_str
+                    .parse()
+                    .map_err(|e| format!("failed to decode output index: {e:?}"))?;
+                Ok(OutputReference(TransactionInput {
+                    transaction_id,
+                    index,
+                }))
+            }
+            _ => Err("malformed output reference: expected a hex-encode string and an index separated by '#'".to_string()),
+        }
+    }
+}
+
+pub struct Redeemer {}
+
+impl Redeemer {
+    pub fn mint(index: u32, data: PlutusData, ex_units: ExUnits) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Mint,
+                index,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+
+    pub fn spend(
+        (inputs, target): (&[TransactionInput], &TransactionInput),
+        data: PlutusData,
+        ex_units: ExUnits,
+    ) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Spend,
+                index: inputs
+                    .iter()
+                    .enumerate()
+                    .find(|(_, i)| *i == target)
+                    .unwrap()
+                    .0 as u32,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+
+    pub fn publish(
+        index: u32,
+        data: PlutusData,
+        ex_units: ExUnits,
+    ) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Cert,
+                index,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+
+    pub fn vote(index: u32, data: PlutusData, ex_units: ExUnits) -> (RedeemersKey, RedeemersValue) {
+        (
+            RedeemersKey {
+                tag: RedeemerTag::Vote,
+                index,
+            },
+            RedeemersValue { data, ex_units },
+        )
+    }
+}
+
+pub fn void() -> PlutusData {
+    PlutusData::Constr(Constr {
+        tag: 121,
+        any_constructor: None,
+        fields: MaybeIndefArray::Indef(vec![]),
+    })
+}
+
+pub fn from_network(network: Network) -> NetworkId {
+    match network {
+        Network::Mainnet => NetworkId::Mainnet,
+        _ => NetworkId::Testnet,
+    }
+}
+
+pub fn non_empty_set<T>(set: Vec<T>) -> Option<NonEmptySet<T>>
+where
+    T: std::fmt::Debug,
+{
+    if set.is_empty() {
+        None
+    } else {
+        Some(NonEmptySet::try_from(set).unwrap())
+    }
+}
+
+pub fn non_empty_pairs<K, V>(pairs: Vec<(K, V)>) -> Option<NonEmptyKeyValuePairs<K, V>>
+where
+    V: Clone,
+    K: Clone,
+{
+    if pairs.is_empty() {
+        None
+    } else {
+        Some(NonEmptyKeyValuePairs::Def(pairs))
+    }
+}
+
+pub fn into_outputs(outputs: Vec<PostAlonzoTransactionOutput>) -> Vec<TransactionOutput> {
+    outputs
+        .into_iter()
+        .map(PseudoTransactionOutput::PostAlonzo)
+        .collect()
+}
+
+pub fn singleton_assets<T: Clone>(
+    validator_hash: Hash<28>,
+    assets: &[(AssetName, T)],
+) -> Multiasset<T> {
+    NonEmptyKeyValuePairs::Def(vec![(
+        validator_hash,
+        NonEmptyKeyValuePairs::Def(assets.to_vec()),
+    )])
+}
+
+pub fn from_validator(validator: &[u8], network_id: Network) -> (Hash<28>, ShelleyAddress) {
+    let validator_hash = Hasher::<224>::hash_tagged(validator, 3);
+    let validator_address = ShelleyAddress::new(
+        network_id,
+        ShelleyPaymentPart::script_hash(validator_hash),
+        ShelleyDelegationPart::script_hash(validator_hash),
+    );
+
+    (validator_hash, validator_address)
+}
+
+pub fn value_subtract_lovelace(value: Value, lovelace: u64) -> Option<Value> {
+    match value {
+        Value::Coin(total) if total > lovelace => Some(Value::Coin(total - lovelace)),
+        Value::Multiasset(total, assets) if total > lovelace => {
+            Some(Value::Multiasset(total - lovelace, assets))
+        }
+        _ => None,
+    }
+}
+
+pub fn value_add_lovelace(value: Value, lovelace: u64) -> Value {
+    match value {
+        Value::Coin(total) => Value::Coin(total + lovelace),
+        Value::Multiasset(total, assets) => Value::Multiasset(total + lovelace, assets),
+    }
+}
+
+pub fn lovelace_of(value: &Value) -> u64 {
+    match value {
+        Value::Coin(lovelace) | Value::Multiasset(lovelace, _) => *lovelace,
+    }
+}
+
+pub fn new_min_value_output<F>(per_byte: u64, build: F) -> PostAlonzoTransactionOutput
+where
+    F: Fn(u64) -> PostAlonzoTransactionOutput,
+{
+    let value = build(1);
+    let mut buffer: Vec<u8> = Vec::new();
+    cbor::encode(&value, &mut buffer).unwrap();
+    // NOTE: 160 overhead as per the spec + 4 bytes for actual final lovelace value.
+    // Technically, the final value could need 8 more additional bytes if the resulting
+    // value was larger than 4_294_967_295 lovelaces, which would realistically never be
+    // the case.
+    build((buffer.len() as u64 + 164) * per_byte)
+}
+
+pub fn total_execution_cost(params: &BuildParams, redeemers: &[ExUnits]) -> u64 {
+    redeemers.iter().fold(0, |acc, ex_units| {
+        acc + ((params.price_mem * ex_units.mem as f64).ceil() as u64)
+            + ((params.price_steps * ex_units.steps as f64).ceil() as u64)
+    })
+}
+
+pub fn script_integrity_hash(
+    redeemers: Option<&NonEmptyKeyValuePairs<RedeemersKey, RedeemersValue>>,
+    datums: Option<&NonEmptyKeyValuePairs<Hash<32>, PlutusData>>,
+    language_views: &[(Language, &[i64])],
+) -> Option<Hash<32>> {
+    if redeemers.is_none() && language_views.is_empty() && datums.is_none() {
+        return None;
+    }
+
+    let mut preimage: Vec<u8> = Vec::new();
+    if let Some(redeemers) = redeemers {
+        cbor::encode(redeemers, &mut preimage).unwrap();
+    }
+
+    if let Some(datums) = datums {
+        cbor::encode(datums, &mut preimage).unwrap();
+    }
+
+    // NOTE: This doesn't work for PlutusV1, but I don't care.
+    if !language_views.is_empty() {
+        let mut views = language_views.to_vec();
+        // TODO: Derive an Ord instance in Pallas.
+        views.sort_by(|(a, _), (b, _)| match (a, b) {
+            (Language::PlutusV3, Language::PlutusV3) => Ordering::Equal,
+            (Language::PlutusV3, _) => Ordering::Greater,
+            (_, Language::PlutusV3) => Ordering::Less,
+
+            (Language::PlutusV2, Language::PlutusV2) => Ordering::Equal,
+            (Language::PlutusV2, _) => Ordering::Greater,
+            (_, Language::PlutusV2) => Ordering::Less,
+
+            (Language::PlutusV1, Language::PlutusV1) => Ordering::Equal,
+        });
+        cbor::encode(NonEmptyKeyValuePairs::Def(views), &mut preimage).unwrap()
+    }
+
+    Some(Hasher::<256>::hash(&preimage))
+}
+
+pub fn default_transaction_body() -> TransactionBody {
+    TransactionBody {
+        auxiliary_data_hash: None,
+        certificates: None,
+        collateral: None,
+        collateral_return: None,
+        donation: None,
+        fee: 0,
+        inputs: Set::from(vec![]),
+        mint: None,
+        network_id: None,
+        outputs: vec![],
+        proposal_procedures: None,
+        reference_inputs: None,
+        required_signers: None,
+        script_data_hash: None,
+        total_collateral: None,
+        treasury_value: None,
+        ttl: None,
+        validity_interval_start: None,
+        voting_procedures: None,
+        withdrawals: None,
+    }
+}
+
+pub fn default_witness_set() -> WitnessSet {
+    WitnessSet {
+        bootstrap_witness: None,
+        native_script: None,
+        plutus_data: None,
+        plutus_v1_script: None,
+        plutus_v2_script: None,
+        plutus_v3_script: None,
+        redeemer: None,
+        vkeywitness: None,
+    }
+}
+
+// Build a transaction by repeatedly executing some building logic with different fee and execution
+// units settings. Stops when a fixed point is reached. The final transaction has corresponding
+// fees and execution units.
+pub fn build_transaction<F>(params: &BuildParams, resolved_inputs: &[ResolvedInput], with: F) -> Tx
+where
+    F: Fn(u64, &[ExUnits]) -> Tx,
+{
+    let empty_ex_units = || {
+        vec![
+            ExUnits { mem: 0, steps: 0 },
+            ExUnits { mem: 0, steps: 0 },
+            ExUnits { mem: 0, steps: 0 },
+            ExUnits { mem: 0, steps: 0 },
+        ]
+    };
+
+    let mut fee = 0;
+    let mut ex_units = empty_ex_units();
+    let mut tx;
+    let mut attempts = 0;
+    loop {
+        tx = with(fee, &ex_units[..]);
+
+        // Convert to minted_tx...
+        let mut serialized_tx = Vec::new();
+        cbor::encode(&tx, &mut serialized_tx).unwrap();
+
+        let mut calculated_ex_units = if resolved_inputs.is_empty() {
+            empty_ex_units()
+        } else {
+            // Compute execution units
+            let minted_tx = cbor::decode(&serialized_tx).unwrap();
+            eval_phase_two(
+                &minted_tx,
+                resolved_inputs,
+                None,
+                None,
+                &SlotConfig::default(),
+                false,
+                |_| (),
+            )
+            .expect("script evaluation failed")
+            .into_iter()
+            .map(|r| r.0.ex_units)
+            .collect::<Vec<_>>()
+        };
+
+        let estimated_fee = {
+            // NOTE: This is a best effort to estimate the number of signatories since signatures
+            // will add an overhead to the fee. Yet, if inputs are locked by native scripts each
+            // requiring multiple signatories, this will unfortunately fall short.
+            //
+            // For similar reasons, it will also over-estimate fees by a small margin for every
+            // script-locked inputs that do not require signatories.
+            //
+            // This is however *acceptable* in our context.
+            let num_signatories = tx.transaction_body.inputs.len()
+                + tx.transaction_body
+                    .required_signers
+                    .as_ref()
+                    .map(|xs| xs.len())
+                    .unwrap_or(0);
+
+            params.fee_constant
+                + params.fee_coefficient
+                    * (5 // cbor overhead 
+                     //+ 16 * ex_units.len() // Redeemers. probably not needed.
+                     + 102 * num_signatories // Reference?!  
+                     + serialized_tx.len()) as u64
+                + total_execution_cost(params, &ex_units)
+        };
+
+        calculated_ex_units.extend(empty_ex_units());
+        attempts += 1;
+
+        // Check if we've reached a fixed point, or start over.
+        if fee >= estimated_fee
+            && calculated_ex_units
+                .iter()
+                .zip(ex_units)
+                .all(|(l, r)| l.eq(&r))
+        {
+            break;
+        } else if attempts >= 3 {
+            panic!("failed to build transaction: did not converge after three attempts.");
+        } else {
+            ex_units = calculated_ex_units;
+            fee = estimated_fee;
+        }
+    }
+    tx
+}
+
+pub fn expect_post_alonzo(output: &TransactionOutput) -> &PostAlonzoTransactionOutput {
+    if let TransactionOutput::PostAlonzo(ref o) = output {
+        o
+    } else {
+        panic!("expected PostAlonzo output but got a legacy one.")
+    }
+}
diff --git a/src/tx/send.rs b/src/tx/send.rs
new file mode 100644
index 0000000..728060d
--- /dev/null
+++ b/src/tx/send.rs
@@ -0,0 +1,80 @@
+use anyhow::Result;
+use minicbor::encode;
+use pallas_addresses::{Address, ShelleyAddress, ShelleyDelegationPart};
+use pallas_primitives::{
+    conway::{
+        PostAlonzoTransactionOutput, TransactionBody, TransactionInput, TransactionOutput, Tx,
+        Value, WitnessSet,
+    },
+    Coin, Nullable, Set,
+};
+
+use crate::{cardano::cardano::Cardano, wallet::Wallet};
+
+use super::{
+    context::TxContext,
+    plutus::{
+        build_transaction, default_transaction_body, default_witness_set, expect_post_alonzo,
+        from_network, into_outputs, value_subtract_lovelace, BuildParams,
+    },
+};
+
+pub async fn send<T>(ctx: TxContext<T>, outputs: Vec<(Address, u64)>) -> Result<String>
+where
+    T: Cardano,
+{
+    let available_utxos = ctx.available_utxos().await.unwrap();
+    let wallet_address = ctx.wallet_address();
+
+    let mut tx = build_transaction(
+        &ctx.build_parameters().await,
+        &available_utxos,
+        |fee, ex_units| {
+            let inputs = available_utxos
+                .iter()
+                .map(|u| u.input.clone())
+                .collect::<Vec<TransactionInput>>();
+            let x = expect_post_alonzo(&available_utxos[0].output);
+            let mut outputs = vec![];
+            // let mut outputs = outputs.iter().map(|(addr, amount)| {
+            //     TransactionOutput::PostAlonzoTransactionOutput {
+            //         address: addr,
+            //         value: Value::Coin(amount * 1_000_000) ,
+            //         datum_option: None,
+            //         script_ref: None,
+            //     }
+            // }).collect::<Vec<TransactionOutput>>();
+            outputs.push(
+                // Change
+                PostAlonzoTransactionOutput {
+                    address: wallet_address.to_vec().into(),
+                    value: value_subtract_lovelace(x.value.clone(), fee).expect("not enough fuel"),
+                    datum_option: None,
+                    script_ref: None,
+                },
+            );
+
+            // ----- Put it all together
+            Tx {
+                transaction_body: TransactionBody {
+                    inputs: Set::from(inputs),
+                    network_id: Some(from_network(ctx.cardano.network_id())),
+                    outputs: into_outputs(outputs),
+                    fee,
+                    ..default_transaction_body()
+                },
+                transaction_witness_set: WitnessSet {
+                    ..default_witness_set()
+                },
+                success: true,
+                auxiliary_data: Nullable::Null,
+            }
+        },
+    );
+    ctx.wallet.sign(&mut tx);
+    let mut serialized_tx = Vec::new();
+    println!("{:#?}", tx);
+    encode(&tx, &mut serialized_tx).unwrap();
+    let tx_hash = ctx.cardano.submit(serialized_tx).await?;
+    Ok(tx_hash)
+}
diff --git a/src/tx/torso.rs b/src/tx/torso.rs
new file mode 100644
index 0000000..c2ae735
--- /dev/null
+++ b/src/tx/torso.rs
@@ -0,0 +1,51 @@
+// /// Torso: the main part of the body relevant to tx building.
+
+// use pallas_addresses::{Network, ShelleyAddress, ShelleyDelegationPart, ShelleyPaymentPart};
+// use pallas_codec::{
+//     minicbor as cbor,
+//     utils::{NonEmptyKeyValuePairs, NonEmptySet, Set},
+// };
+// use pallas_crypto::hash::{Hash, Hasher};
+// use pallas_primitives::{conway::{
+//     AssetName, Constr, ExUnits, Language, Multiasset, NetworkId, PlutusData,
+//     PostAlonzoTransactionOutput, PseudoTransactionOutput, RedeemerTag, RedeemersKey,
+//     RedeemersValue, TransactionBody, TransactionInput, TransactionOutput, Tx, Value, WitnessSet,
+// }, MaybeIndefArray, PolicyId};
+// use std::{cmp::Ordering, collections::HashMap, str::FromStr};
+// use uplc::tx::{eval_phase_two, ResolvedInput, SlotConfig};
+
+// struct TransactionBody {
+//     inputs: Set<TransactionInput>,
+//     outputs: Vec<TransactionOutput>,
+//     fee: Coin,
+//     ttl: Option<u64>,
+//     certificates: Option<NonEmptySet<Certificate>>,
+//     withdrawals: Option<NonEmptyKeyValuePairs<RewardAccount, Coin>>,
+//     auxiliary_data_hash: Option<Bytes>,
+//     validity_interval_start: Option<u64>,
+//     mint: Option<Multiasset<NonZeroInt>>,
+//     script_data_hash: Option<Hash<32>>,
+//     collateral: Option<NonEmptySet<TransactionInput>>,
+//     required_signers: Option<RequiredSigners>,
+//     network_id: Option<NetworkId>,
+//     collateral_return: Option<T1>,
+//     total_collateral: Option<Coin>,
+//     reference_inputs: Option<NonEmptySet<TransactionInput>>,
+//     voting_procedures: Option<VotingProcedures>,
+//     proposal_procedures: Option<NonEmptySet<ProposalProcedure>>,
+//     treasury_value: Option<Coin>,
+//     donation: Option<PositiveCoin>,
+// }
+
+// pub struct Torso {
+//     inputs: Vec<ResolvedInput>,
+//     reference_inputs: Vec<ResolvedInput>,
+//     outputs: Vec<TransactionOutput>,
+//     mint: HashMap<PolicyId, HashMap<AssetName, i64>>,
+//     voting_procedures: Vec<Votes>
+//     collateral: Vec<ResolvedInput>,
+//     required_signers: Vec<VerificationKeyHash>,
+// }
+//
+// pub struct WitnessPart {
+// }
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..9f5c5d8
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,22 @@
+use anyhow::{anyhow, Result};
+
+pub fn v2a<T, const N: usize>(v: Vec<T>) -> Result<[T; N]> {
+    v.try_into()
+        .map_err(|v: Vec<T>| anyhow!("Expected a Vec of length {}, but got {}", N, v.len()))
+}
+
+pub fn concat<T: Clone>(l: &[T], r: &[T]) -> Vec<T> {
+    let mut n = l.to_vec();
+    n.extend(r.iter().cloned());
+    return n;
+}
+
+pub fn unzip<A, B>(zipped: Vec<(A, B)>) -> (Vec<A>, Vec<B>) {
+    let mut va: Vec<A> = Vec::with_capacity(zipped.len());
+    let mut vb: Vec<B> = Vec::with_capacity(zipped.len());
+    for (a, b) in zipped.into_iter() {
+        va.push(a);
+        vb.push(b);
+    }
+    (va, vb)
+}
diff --git a/src/wallet.rs b/src/wallet.rs
new file mode 100644
index 0000000..796a58a
--- /dev/null
+++ b/src/wallet.rs
@@ -0,0 +1,78 @@
+use std::collections::HashMap;
+
+use cryptoxide::hashing::blake2b_256;
+use minicbor::encode;
+use pallas_addresses::ShelleyPaymentPart;
+use pallas_crypto::hash::{Hash, Hasher};
+use pallas_crypto::key::ed25519::Signature;
+use pallas_crypto::{self, key::ed25519::SecretKey};
+use pallas_primitives::conway::{Tx, VKeyWitness};
+
+use crate::tx::plutus::non_empty_set;
+use crate::utils::v2a;
+
+use rand::{rngs::OsRng, TryRngCore};
+
+const PREFIX: &str = "wallet_";
+
+pub struct Wallet {
+    pub skey: [u8; 32],
+}
+
+impl Wallet {
+    pub fn vkey(&self) -> [u8; 32] {
+        SecretKey::from(self.skey).public_key().into()
+    }
+
+    pub fn key_hash(&self) -> Hash<28> {
+        Hasher::<224>::hash(SecretKey::from(self.skey).public_key().as_ref())
+    }
+
+    pub fn payment_credential(&self) -> ShelleyPaymentPart {
+        ShelleyPaymentPart::Key(self.key_hash())
+    }
+
+    pub fn sign_hash(&self, h: &[u8; 32]) -> Signature {
+        SecretKey::from(self.skey).sign(h)
+    }
+
+    pub fn sign(&self, tx: &mut Tx) {
+        let mut msg = Vec::new();
+        encode(&tx.transaction_body, &mut msg).unwrap();
+        let tx_hash = blake2b_256(&msg);
+        let sig = self.sign_hash(&tx_hash);
+        tx.transaction_witness_set.vkeywitness = non_empty_set(vec![VKeyWitness {
+            vkey: self.vkey().to_vec().into(),
+            signature: sig.as_ref().to_vec().into(),
+        }])
+    }
+}
+
+pub fn from_env(env: &HashMap<String, String>) -> Wallet {
+    let wallet_env: HashMap<String, String> = env
+        .iter()
+        .filter_map(|(k, v)| k.strip_prefix(PREFIX).map(|k| (k.to_string(), v.clone())))
+        .collect();
+    let raw = wallet_env.get("key").expect("wallet key not found");
+    let skey = parse_raw_skey(raw);
+    Wallet { skey }
+}
+
+pub fn generate() -> [u8; 32] {
+    let mut key = [0u8; 32];
+    OsRng.try_fill_bytes(&mut key).unwrap();
+    key
+}
+
+fn parse_raw_skey(raw: &str) -> [u8; 32] {
+    // FIXME :: Not tested
+    if raw.len() == 64 {
+        // Assume hex
+        v2a(hex::decode(raw).expect("expected hex")).expect("wrong length")
+    } else if raw.len() == 70 {
+        // Assume Bech
+        v2a(bech32::decode(raw).unwrap().1).expect("wrong length")
+    } else {
+        panic!("Not supported")
+    }
+}