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 0x13284ba139b1b6d29693ce7d233cbd1a3f4076f63106dee4c090004894155498. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a36c2f4-746b-4177-a982-6db9bc84beb7.json and https://artists.proofprofile.net/proofs/artist/1a36c2f4-746b-4177-a982-6db9bc84beb7.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 0x2240052fabaa9834ec1a350cb2468188280b259039ab522fca47c627e8a1122e. 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/NL1MC2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5357ff73493e095a2a34958975dc6b95c8a76f6d5905ab969b74955101259f0. 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/NL1MC2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5702e49bc573d8f3d6d9f8343efdd79258373e9fdb8e90461b91c77baf1348f1. 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/NL1MC2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3845a57fe302c468e3dce83867dcf2ec878a1a1d48e3fc98c10b64440a8def49. 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/NL1MC2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea64fe99c396bded82eb7deceb3aeea4d8ea02f5cfab8cb184d9f51bcad7852. 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/NL1MC2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdc4927d60a56c198c3447c1b6684d93fcf8a6eb1ee2160212e238c720ad574. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1MC2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f869387926d88848c09c8629c5106906f9a05c175659bbcc7c3a97add45ec5a. 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/NL1MC2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9609df6aa6ff56211ccb05e91607e59a22eec4080cb2a38694e952fba5e41dc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1MC2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc09eca493f787eada218e1302d71161b2a53c446349c1393951cd292157bed. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NL1MC2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8855807649269ac51f3c96e2ba38430774ab82d647f5c8c7b52116e92483fb. 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/QZFZ22139752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6245d253c7460929675685b308eb43265457e2592afe3213e53891fdd37a0dd8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1MC2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ebb43969710cf3f80eae816fbcd2f59b66941b28e8dd69b65da23b42a72a4a. 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/NL1MC2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf141bce8b49d5f51a51235aa306aca070f6f863e289c183f48465b60a2486da6. 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/NL1MC2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d760507d23552b3ed78e18c54e9b5fff0b0c1abe6f2f42ab41e88b6ad8359de. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1MC2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f240ce481e96fe73fc148a36e43ee02f424c92bf316e9495c1bb95bcb88462. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NL1MC2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c2957e8d5ca1589768faa8f07d2a8135dc763df1d0f2fff5dc90f23204be11. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLD8Y2300002.