thumb|Frank Schubert with the lens of the Coney Island Light in 1961 Frank Schubert (1915–2003) was the lighthouse keeper of the Coney Island Light for over 40 years. He was among the last civilian l
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 0x041ef303459fe480bddfd7563072f439033af2df89a6e7164038eea723e644c0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65c13f52-2f2f-4ffc-9b0b-9061f81467e2.json and https://artists.proofprofile.net/proofs/artist/65c13f52-2f2f-4ffc-9b0b-9061f81467e2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.