thumb|right|260px|John Stowell (2019) in Aarhus, Denmark John F. Stowell (born July 30, 1950) is an American jazz guitarist, composer, author, and lecturer. Biography Stowell, who plays electric a
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 0x30cf8090bd0ecab0835ab0247b4e81f103f5a6662fc37d01b89f9d73f8edb2ff. 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/f43a03df-b1fe-41f4-bda2-22a371e0fa2f.json and https://artists.proofprofile.net/proofs/artist/f43a03df-b1fe-41f4-bda2-22a371e0fa2f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Snow Angels (Live At Lucia Douglas Gallery)
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 0xb40b62284b6f84de315722406ffe44e6ce17c6c2a7b852086fe3fb0fe6d54b2b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3M81302950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df13efbd9b8a68c3a80d55f6b348ae3323e042dd7da7fe2b426d3b85574f731. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3M81302958.
Petite Fleur: The Music of Sidney Bechet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4950aa19573cf6eedd13864f5da9aa38a42b8a397c9667dd6cc45031fac956ca. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3M81804460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1d14d305aa8731555652d8e7a7e90eea8268109c713c6a3fb8de8cf3cd6d98. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3M81804461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfb1be34314d22d28cc7df60b25b99d121758a5b360ab55490f221b19bab9d7. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3M81804462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de5d7f9713fe17023789fd3954692460d1fddb60bdb8dbbb8db8d67794062a8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3M81804467.