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 0xc9c889382906ae52a15548490b9d6be43c7f1b353bfd3658eb571d1fdc65628a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58fbc737-ea5d-4c08-8ccf-37688bdf56bd.json and https://artists.proofprofile.net/proofs/artist/58fbc737-ea5d-4c08-8ccf-37688bdf56bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x17237ee6ceea3793e479d2d88166f4af9e67f3b929c0d5eaf0c133f51c765bb7. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QM3DF2151249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d50f659dc5d176f653cf8132dc4d0f2c53c8793840113919c5d4fdce25e412. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/US3DF2255746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d014cb04911a956b6464adfeb5b544c8976ce986546bab87746d15bb7ba146. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/US3DF2263980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf63b09554072fb0d081e1e54b2652d1fe79a930f5eb639b29efc2c1fef7271f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US3DF2274327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff43cca7b96c80ead5ee79135d1ab37a76ef65065c6d309c38b9d65f7ceffc6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2209175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259cf75a11c4e6c694df9209b9c7f4b4dd5900cc31d8d3b0561ae88dc824d5c8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2232296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce81d9ffbd11563351b5b323eb9946cbe0a4812f60e0027837656bf3768cabe9. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USANG2270143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b912384121892eb6bb89dd9b1ef0d0b3d8f272ef08162d56fd17b6c8d0cad92. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QM3DF2200151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cbab936d741258ab33456e2fc96c16cce2d056266273b4bdc65c630e82c95f. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/US3DF2402139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9392a7121ced5406b3a126ed266c5a5dda593fc5762b7c325b9355544b0253b6. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:51:43Z), 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/QZTLA2425472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d40d354749f71a271fe6c32a2544ec05470d9e3fad381e4b810b3369ac0adee. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:10:52Z), 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/US3DF2457859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa811fdb09163fc017256ac5d93a4192948965ab525ac5ef8c4af9728ec66f1f1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US3DF2472882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a451c4b36ec7ded001f4eb0af5e78aeb19d6b980d8a931eff0b43366663459. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FR96X2480489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e9593fcb79e3e8b0353c36d9dfde9786560df35d48422567b831a7cb53a905. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:07:38Z), 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/FRX202411683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0aa53e92eddc81cf5a6d52fd70936c5ee2f4c6f2387eec7283cc98a53e382e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM3DF2409837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd72cdec2e6966b6243bb7e8160a4599782277751e5ce09bf002d8d8c7b7626. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM3DF2409844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a88e4968b370c1d9318f45a611edebe8f878a972c337264c60ae099230c6fe. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:30:58Z), 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/QM3DF2409847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01895e6f8e7331c647dfee0dcaf8c4ee1105d8641cbd30e3c4b68e9fe56b135. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM3DF2128269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cee2fca79e004f83eaa7f50de58cf879198d33538af7e407c9ab253498c8a2c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM3DF2128262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af0218489901f62ebc92db4284a8b8c3eddd2277d4331511c4fa661d82a4d12. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US3DF2207078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf17f0cc9b3b015a62519bc129045b3d6c3acfdc52e7e68cfdfbb1407d51d1e4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US3DF2072464.