# Hello, World! An example of an Hello, World! contract using Aiken and [Mesh](https://meshjs.dev/). See the [full tutorial on aiken-lang.org](https://aiken-lang.org/example--hello-world/end-to-end/mesh). ## Setup ### Building ``` aiken build ``` ### Initializing workspace ``` npm init -y npm install @meshsdk/core tsx ``` ### Setup environment variables ``` export BLOCKFROST_PROJECT_ID=preprod... ``` ## Usage ### Generating Credentials ``` npx tsx generate-credentials.ts ``` ### Locking Funds > **Warning** Require `BLOCKFROST_API_KEY` environment variable to be set. ``` npx tsx lock.ts ``` Successful transaction hash: `bfa4818940831dff961a2f097e1aef9bf626de744fd96abfd2be7d6b61afb270` (preprod) ### Unlocking Funds > **Warning** Require `BLOCKFROST_API_KEY` environment variable to be set. ``` npx tsx unlock.ts TRANSACTION_ID_FROM_LOCK ``` Successful transaction hash: `1f8f3abac70c3a71c6aa943b4b9a6ac002e63a69225eb59305c3cd663cda3dd7` (preprod)