Zabu is a fictional saber-toothed cat appearing in American comic books published by Marvel Comics. Zabu is connected primarily to the Savage Land, and the X-Men, and most recently the Avengers (by wa
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd56344bab2c27cc7076326b98e9af1e382f956ad1b09c3c71970fbbcc81d32f. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91f93817-881f-4bbf-bb35-0c3fb0a83a87.json and https://artists.proofprofile.net/proofs/artist/91f93817-881f-4bbf-bb35-0c3fb0a83a87.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.