thumb|Map of the Earth's oceanic crust, with colours indicating the age of the crust. Lighter shades indicate younger age, and darker shades indicate older age. The lines represent tectonic plate boun
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 0xebc65b12fdaf724e75c192125a8ffdf54d4383c020b965bf1ea2acd2d904f5e6. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c170c195-308b-42bb-912f-8675db64c45e.json and https://artists.proofprofile.net/proofs/artist/c170c195-308b-42bb-912f-8675db64c45e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).