thumb|right|Return of the Spies, 1860 woodcut by Julius Schnorr von Karolsfeld Caleb (; , Tiberian vocalization: , Modern Israeli Hebrew: ) is a figure who appears in the Hebrew Bible as a represe
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 0x478c91c22a3228429df5033869a174e9ed0f55ec0d9d1c82486f3bd0d412945e. Chain 2 (Bitcoin): anchored in block 954063 (2026-06-17T07:49:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/481d68af-a153-4318-abf4-0151c08e2769.json and https://artists.proofprofile.net/proofs/artist/481d68af-a153-4318-abf4-0151c08e2769.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).