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 0xb72d10351f2bda0b4abea2f952d29de939dceefff1d7fe96d5bae2f9c0dd9683. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af488c98-9e71-4db1-aac9-7b9ec7e3ab62.json and https://artists.proofprofile.net/proofs/artist/af488c98-9e71-4db1-aac9-7b9ec7e3ab62.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Julie-O - Arr. for Cello and Guitar by Slava Grigoryan
Classical Music to Lift Your Spirits Vol. 2
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x84ea7f7c791ec8ffe6bb7431efb0c46016aba19c59bf2db66c5d43b88a677bc3. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB01950348 — a six-check JSON result.
Pièce en forme de Habanera, M. 51 - Arr. for Cello and Guitar by Slava Grigoryan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d1c184f1eab917441202259e057820acf81e066f0f5f6a6f41fdc7edcb6fbc. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB01950352 — a six-check JSON result.
Tanto Espaço - Arr. for Cello and Guitar by Slava Grigoryan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5232760377f31f373fe4e4e1ff8ddef0e8b831a1ccaf086acc36f8d09173f41a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB01950350 — a six-check JSON result.
Ave Maria - Arr. for Cello and Two Guitars by Slava Grigoryan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b41be0e9f46a0ae16839809a8ddfb137bb7e9afad4527d982e5106d46997252. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB01950360 — a six-check JSON result.