thumb|upright| thumb| thumb|upright| The Schöneberger Sängerknaben were a German boys' choir from Berlin, named after the . The choir performed with about 30 boys at a time. They wore short black tro
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 0x580d733932b0797f233fc8f5dc2cca78de68c27681225f47878f8a2b3d1360f9. Chain 2 (Bitcoin): anchored in block 953924 (2026-06-16T09:52:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d3f5df1-1a8c-4490-9bc2-aa3c8c39b965.json and https://artists.proofprofile.net/proofs/artist/1d3f5df1-1a8c-4490-9bc2-aa3c8c39b965.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).