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 0x1359115a065d2cb31c58b7815b80c229bd3c333d4738dc9d8c85844ed28789c5. 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/57e052be-7916-4669-b729-00def758c5fa.json and https://artists.proofprofile.net/proofs/artist/57e052be-7916-4669-b729-00def758c5fa.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 0xbd8a0d8d3ad45c7206ea7a2eac3398a3e61397b04b9b7e9d79d49a94f1a4e421. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/NLFL72100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae239314b5fdcfdd25ca53897abd1b2af4c1276432563a660cbe2192ee6fbffe. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/NLFL72100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853e9c3fd4ff156d0656efab20e68e19235263fad555f81295fb32607ca88c24. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLFL72101121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb6f12d0b81165a119b96184f095bb417f24e596a36f56e45c3ff4f03c3169d. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLFL72101123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750dc9daef4ab82c98add861fc2cf0e2820ccba2359b415e1e1c279ddd36bd60. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NLFL72101125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b54a8f890f94d0dabb16e4679a7c3aba58eb99d18929fa44eb55adf61056b87. 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/NLFL72100821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0bb54add7cb5ba4caf904939b7243ae7ec3dadf8698eff8ca54e42e42c7f19. 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/NLFL72100389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e95ddbb974eddde5c311a7e2b9f9ce6cddf1b71fdb220ff7b846f09e96fd4f1. 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/NLFL72200293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae625d587e8f487af6f472e08a41538cede8e7b6a1a7b4607f0d9638da4f1f55. 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/QZFYX2477093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1b77e35bda7725068370774926a030e830e0edf2fddbe7b2c91910d7e1ba56. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLFL72100541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6cd9b64f6ea89ff05d7957e8649c8cc027c91cab173f29673616877b9178d6. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:18:14Z), 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/NLFL72100195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cda58a6f230c81ae1e729e227de21e5f45f1d54899f0905b1b2e95bc56b5388. 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/NLFL72100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8906aa89e74a26784ee8596037b4130c3fe102e1c1925385d7843979f04503c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLFL72200361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bece296d0cba3d0f4b686140d140344e4f1004b86dc72dd101939c15e6df77f. 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/UKU932432074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a99a626ab037c481c5550b0f79fa529610e42814d6bb570e1f1af59d430d4de. 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/NLFL72000535.