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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa76906b23106f99aa0ab64406e68f2ae7c3606073347930d73af07f5f27fd2. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3e58dfa-ab8f-4b9e-bbc8-9725d40ecfaa.json and https://artists.proofprofile.net/proofs/artist/e3e58dfa-ab8f-4b9e-bbc8-9725d40ecfaa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nielsen / Lange-Muller / Weyse / Hartmann / Kunzen: Serenades and Romances
Heise, Weyse and Lange-Müller: Love Songs