thumb|right|280px|Zeus aiming his thunderbolt at a winged and snake-footed Typhon. Chalcidian black-figured hydria ( BC), Staatliche Antikensammlungen (Inv. 596).Ogden 2013a, p. 69; Gantz, p. 50; LIMC
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 0x7ec2a9066a7b43dd6e7d735c03fbe9f369b186966c63ea21f347c727fe0fbfcf. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9569bc4a-ba97-4789-91dc-7310c6ec21e6.json and https://artists.proofprofile.net/proofs/artist/9569bc4a-ba97-4789-91dc-7310c6ec21e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).