thumb|right|314px|The 1853 negotiations between Russian envoy, Prince Menshikov, and the Turkish Sultan about the protection of Orthodox Christians in the Ottoman Empire involved a series of ultimata.
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 0x75bfbe045b0d96129f5156ff733d37d327a8e61ddea1a765173e609b5e8b5c20. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dafcbd86-e18f-453f-b0da-14ef30a0854d.json and https://artists.proofprofile.net/proofs/artist/dafcbd86-e18f-453f-b0da-14ef30a0854d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jump Into The Pit: A Tribute to Testament