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 0x5342b1d8346b2f3b0d194b8b06e6176c3c8c93f186cdb2e6402cddf314d34e4f. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a296aa4f-d156-483a-b623-8bf9af44d7b9.json and https://artists.proofprofile.net/proofs/artist/a296aa4f-d156-483a-b623-8bf9af44d7b9.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 0x3f61a957784444e22623fd569b7b3a338f5ed0f7a25b73e9ef696beaca80dd45. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/CNF290832301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f7b191d5488d116984bf7d7b2bfa7fdeb3a19b39fc19afcb32941058210ac6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNF290832302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e98182805596ab180213b4d7aa3a83ff76c02a53ede26899e45ddd493bee946. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CNF290832303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd8c9b6565d0d4af42e8f19c84f64aec8b1e6f8aa60832e5764cc8629ba7afb. 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/CNF290832304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dee00c07b100023a7cb6ad37aa52b363d763a23495d57a64283053208a095d7. 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/CNF290832305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f27c4b6c1735f7a5a0f0665e8ad8f0890972f83f80913a52dc4bd4f65b501b. 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/CNF290832306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ae80282ee52303e6564e454a81bdc19af91a4c01838d3e30ec310e4112c4f9. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CNF290832307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7ead8233df5f3aaf16da16944e330783e8bcc5405c7256290bb73c5b159922. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/CNF290832308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a74fdc3ab14e776c38d3f68fec5d89106be888abddf9e8652f385237145123. 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/CNF290832309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a1d5cdeb0e064254b55ddca6b036b0c65f4697cc3665b9bc505c7ca6af4329. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CNF290832310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba39b8fd56760823b3823021f5678b6ff9cd5dab9a581261f25f6ca908ac8b78. 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/CNF290832311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ebff12223dc955b7a2e0f0bbb09cc73eb8b857a7d0f3bbb740e7c75baecdd2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNF290832312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1eb2ebef7a0bad670e019f867f17a3caace3af090da7d361f4fd4e5e59c62b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CNF290832313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cc5050198dfc580a49f825f2b8e5c02be9c20231c28b7347a1ee6ff3f1bd72. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/CNF290832314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412135bf79817765acc19267cb1e5535ca167816137c77113d38cd4a7af9db32. 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/CNF290832315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9539facb114acb96681a4f6c65ec77208706ef3d96223ed85e10e248252201f6. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/HKG731604368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53896751b7c933b57b343c291a95ccd7781ad6d848abfda99ae922b368a1f3bc. 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/CNF290931115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7394e2ddeeaf73bfb34988d9b2cbea41cd7e1bd009aebdbc82ecfd83e9b40c. 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/CNF290931109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42a15c4765d7d48bbd1dd567e4ea1913aae91a189b627ffee2190cab3844337. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNF290931112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eb98efebe335b5d0f9b7845a0853e44ccd9cafd8634fc4ca779457a09479b0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNF290931105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde26306d404b37982f1e23e9bb282b2ed157a61319919d9a40225fd1daeb8d01. 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/CNF290931113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aab0be02ff127e81cf43dd7c08e29aff2a13f9552e3c6142e85b161121f500. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNF290831405.