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Add transfer_expiry example #22

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892a7af
Add transfer_expiry example
vicsn Oct 21, 2025
818af43
.gitignore build files
vicsn Oct 21, 2025
26b25dd
Add support for nonce-based transactions
vicsn Oct 21, 2025
c79ef10
Rename leo test
vicsn Oct 23, 2025
27c5c9a
Fixes to enable test to run
vicsn Oct 28, 2025
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2 changes: 2 additions & 0 deletions .gitignore
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.idea/
**/README.md

**/build
5 changes: 5 additions & 0 deletions transfer_expiry/.gitignore
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.env
*.avm
*.prover
*.verifier
outputs/
16 changes: 16 additions & 0 deletions transfer_expiry/program.json
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{
"program": "transfer_public_expiry.aleo",
"version": "0.1.0",
"description": "",
"license": "MIT",
"leo": "3.2.0",
"dependencies": [
{
"name": "credits.aleo",
"location": "network",
"path": null,
"edition": null
}
],
"dev_dependencies": null
}
56 changes: 56 additions & 0 deletions transfer_expiry/src/main.leo
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// The 'transfer_public_expiry' program.
import credits.aleo;

program transfer_public_expiry.aleo {

// Struct to hold address and nonce for hashing
struct NonceKey {
sender: address,
nonce: u64,
}

// Mapping to store used nonces for each sender address
// Key is the NonceKey struct containing address and nonce
mapping used_nonces: NonceKey => bool;

// Default constructor which doesn't allow for program upgrades.
@noupgrade
async constructor() {}

// Wrapper around credits.aleo::transfer_public with an expiry and nonce validation.
async transition transfer_public_with_expiry(
public to: address,
public amount: u64,
public expiry_block_height: u32,
public nonce: u64
) -> Future {
// Get the sender's address before entering async block
let sender: address = self.caller;

// Call the original transfer_public function from credits.aleo
let f1 = credits.aleo/transfer_public(to, amount);

let f2: Future = async {
// Create a NonceKey struct with the sender address and nonce
let nonce_key: NonceKey = NonceKey {
sender: sender,
nonce: nonce,
};

// Check if the nonce has already been used for this sender
let is_used: bool = used_nonces.get(nonce_key);
assert(!is_used);

// Store the nonce as used for this sender
used_nonces.set(nonce_key, true);

// Check if current block height is below the expiry block height
let current_block_height: u32 = block.height;
assert(current_block_height < expiry_block_height);
f1.await();
};

return f2;
}
}

27 changes: 27 additions & 0 deletions transfer_expiry/tests/test_transfer_public_expiry.leo
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// The 'test_transfer_public_expiry' test program.
import transfer_public_expiry.aleo;

program test_transfer_public_expiry.aleo {
// Default constructor which doesn't allow for program upgrades.
@noupgrade
async constructor() {}

@test
async transition test_expiry() -> Future {
// Test the transfer_public_with_expiry function
// This would normally require proper setup with credits, but demonstrates the interface
let to: address = aleo1kanvv2cs88dpguwz5yrv890zz89rmycyk7qe6q4qm7vnz30flyzs56zae8;
let amount: u64 = 1000u64;
let expiry_block_height: u32 = 1000000u32;
let nonce: u64 = 1u64;

// Call the wrapper function
let f1 = transfer_public_expiry.aleo/transfer_public_with_expiry(to, amount, expiry_block_height, nonce);

let f2 = async {
f1.await();
};

return f2;
}
}