{"copyright_id":"0xddf26bfbea40c978c3fbe925d197df5c73bd2a66d0f24152cfd3160fa5fbb6fa","name":"Chopin University Press","registered_at":"2026-06-14T08:53:43Z","symbol":"NIM0401798","token_address":"0xc1f0a9e03a9166621cb25afa93804befe8f98a49","type":"artist","uuid":"29deb38b-21c9-4789-9c7c-edab2bc29d5c"}
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 0xddf26bfbea40c978c3fbe925d197df5c73bd2a66d0f24152cfd3160fa5fbb6fa. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29deb38b-21c9-4789-9c7c-edab2bc29d5c.json and https://artists.proofprofile.net/proofs/artist/29deb38b-21c9-4789-9c7c-edab2bc29d5c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Johann Gottlieb Goldberg: Complete Solo Harpsichord Works