Function attest

atomic-canonical/src/proof.rs:164–167

Produce a fully attested Intent node — a thin wrapper over [`attest_value`] so hash and signature can never drift from any other node type. The round trip through serde is lossless for an already-constructed node (all fields are symmetric), so `from_value` cannot fail.

(node: CanonicalNode, identity: &Identity, keypair: &KeyPair)

/// type. The round trip through serde is lossless for an already-constructed
/// node (all fields are symmetric), so `from_value` cannot fail.
pub fn attest(node: CanonicalNode, identity: &Identity, keypair: &KeyPair) -> CanonicalNode {
    let value = attest_value(node.to_value(), identity, keypair);
    serde_json::from_value(value).expect("attested intent re-deserializes")
}

/// Verify an attested Intent node — thin wrapper over [`verify_value`].
pub fn verify(node: &CanonicalNode, public_key: &PublicKey) -> Result<()> {