Zuco 103 is a Dutch musical ensemble which plays music chiefly in the styles of the music of Brazil. The ensemble was initially founded under the name Rec.a in 1989 by students at the Rotterdam Conse
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 0xa14a6328e5270f5ea912476e5cee1920ea606a812600c0ed4161ce2201299314. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a968fd32-4af1-4d33-bc4a-7268bee866f7.json and https://artists.proofprofile.net/proofs/artist/a968fd32-4af1-4d33-bc4a-7268bee866f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).