HashAnchor

1// HashAnchor - Minimal contract for anchoring file hashes on Flow.
2// Deploy this contract to your account, then use record_hash.cdc to submit hashes.
3// No persistent storage (keeps cost low); the event is the on-chain proof.
4
5access(all) contract HashAnchor {
6
7    // Emitted when a hash is anchored. The transaction ID is the proof.
8    access(all) event HashAnchored(hash: String, timestamp: UFix64)
9
10    access(all) fun recordHash(hash: String) {
11        emit HashAnchored(hash: hash, timestamp: getCurrentBlock().timestamp)
12    }
13}
14