interface IdentityClaim {
$type: 'pub.atp.identity.claim';
service: string; // Target service (dns, nostr, discord, etc.)
identifier: string; // Account identifier (domain, username, pubkey)
claimData?: object; // Additional claim information (public keys, metadata, etc.)
proofs?: { // Array of verification proofs
method: string; // Verification method (dns-txt, bio-link, signature)
proofData?: object; // Service-specific proof information
expiresAt?: string; // Optional expiration
signature?: { // Cryptographic signature