Cryptographic receipt system for ggen operations.

This crate provides a production-ready receipt system with Ed25519 signatures for verifiable operation tracking. Receipts can be chained together to form an auditable trail of operations.

Features

• Ed25519 digital signatures for cryptographic verification
• SHA-256 hashing for data integrity
• Receipt chaining with hash links
• Full serialization support with serde
• Comprehensive error handling

Examples

Creating and signing a receipt

use ggen_receipt::{Receipt, generate_keypair};

let (signing_key, verifying_key) = generate_keypair();

let receipt = Receipt::new(
    "my-operation".to_string(),
    vec!["input-hash-1".to_string()],
    vec!["output-hash-1".to_string()],
    None,
)
.sign(&signing_key)
.expect("Failed to sign receipt");

// Verify the signature
receipt.verify(&verifying_key).expect("Verification failed");

Building a receipt chain

use ggen_receipt::{Receipt, ReceiptChain, generate_keypair};

let (signing_key, verifying_key) = generate_keypair();

// Create genesis receipt
let genesis = Receipt::new(
    "genesis-op".to_string(),
    vec![],
    vec![],
    None,
)
.sign(&signing_key)
.expect("Failed to sign");

let mut chain = ReceiptChain::from_genesis(genesis.clone())
    .expect("Failed to create chain");

// Add a linked receipt
let receipt2 = Receipt::new(
    "second-op".to_string(),
    vec![],
    vec![],
    None,
)
.chain(&genesis)
.expect("Failed to chain")
.sign(&signing_key)
.expect("Failed to sign");

chain.append(receipt2).expect("Failed to append");

// Verify the entire chain
chain.verify(&verifying_key).expect("Chain verification failed");