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 0xcaf4913cfeb696e5f4716205d5866b9e97d9333191e437ca93c3184737815670. 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/24977dc5-ed77-463c-9623-d511c5c9feff.json and https://artists.proofprofile.net/proofs/artist/24977dc5-ed77-463c-9623-d511c5c9feff.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 0xbf4e779c3ee02e08a650ec458517e05e6b19b94a43df960d7968ad667c4b21b7. 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/QMFME2049108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7ce5bac49e66548f36f1b5032c66bd7847737649a3ac43107866d931eb7a10. 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/QMFME2049118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01194879d8979ea785699f56bb1c6fbb5acf670927da32eb392fc0b1ffddbb9a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMFME2049117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ad4def1dcd5e770fef01ecda6421d82fad615d842e1a56514fa6612ce7ae3e. 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/QMFME2049112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad9ae539e7bd90af04d0826a1e02269936066fd35cd837fc09d43b6b5dd6826. 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/QMFME2049113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbaee40d437ac960587e0cab40a64332e11b6ccc77e2212a02ff56fe1767c067. 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/QMFME2049114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fcdeb6a156a39a9bc3720e159e0b93e113f7a582dfcca6522eb4edb9410793. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMFME2049109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eae9db3261f11cb83c4eec2c9f80ecb01ff2f7b1fde915dfc4c8f3312838dcf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QMFME2049116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c95a8a413700154129933ca71b3fe449a221cd9861cc3c418244921682f2112. 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/QMFME2049110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1268a99fb5a9354ba320ec1970ef4fb48f9a005ada942c4df8525326adf8247. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAHD2390328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4611bf5efabf99ed6a937eb90d834ae735cfc0c7cab894098a949b461bbcc865. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCAHD2390338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77360959df853cca5164705cb6bf563b6d16cc8b1e2ec58c447a652f7d04770. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAHD2390530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ac263a0daad7aafaff086f54abe8c90a998595e862c021f5dbbf7177bbd520. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAHD2390545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2587bc40d0a067e1f0e4fec5d24afa3216b1228a3d85e4345bd60ad84a699d12. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T16:50:54Z), 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/AUMEV2482517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccbf4bc6637a1598c62844f1fa85c825c8914637bd2fe84d760e5c9f18aedad. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QMDA72587665.