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 0x062cb5023b4bf39aaf9802577205c54760789d2ac03f945b5a24b6bd874177c6. 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/76c6491f-bdd5-4707-aeb5-d6b71bca2ee2.json and https://artists.proofprofile.net/proofs/artist/76c6491f-bdd5-4707-aeb5-d6b71bca2ee2.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 0x8727c661c9567639a3a2630acc00508af95a5e378815f559b030f8f208e1650c. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZNWV2146125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc698cf7e0251fc3d3e76dd1a5c8370936827cd98cfcb64a15a012dc255b6863. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/ES75E2203049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd403b2c18de2b2d30f1ae7334e467702bba194f53ded47bf6921d4744776fa1c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES64E2202939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a748c37d16bdcd1952f1c2cb8fc283bd4c178c7bfdd2599decbc9c6fed34306. 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/ES64E2203898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b21a32be3433d82c94b77628c3e1fa630875d7ed9b936469643521086e17f45. 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/ES64E2204423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bff0291d1954a0cb7a33fdbac64f7373afefcef0b1f8a9fe3cc1b500d215086. 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/ES64E2205485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f3fcd7b6f18336855270df0efeb28acee1ffe1d45cce52a08608fdb61382ef. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES64E2300202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f6543193db98f9b15f28fb76d9f43de95d0d6761a357ceb006cdd1c5621a04. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ES64E2303063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876ee7c302a9456dc4b40f76e422e67118f20c1b25463ea81fbae391f4f132b9. 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/ES64E2303917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c23a766194fca18815302c1a0a464d3dfa412a95eddff6caa4b6fd4e023671. 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/QMDA72347859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fa4db6a04dba666e4bd64c6618fb56d741a1bfff0162438807829feee1d28d. 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/QM6MZ2405253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3425eeda15434090cbb4d676e163b375de9f8a0b22ccf628649d52fd028379. 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/QM6MZ2405255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e37ff3786cbd6c45ac8ce9b15851e8cde5d5ce3ca4caff5aaf89bbae78b323. 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/QM6MZ2405257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a465e3141fc037735e4b68e09ecbf66a61933e179ea7e682aec8f139952f70e. 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/QM6MZ2405264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c8e34b657b7710203424535be3b010d74a82a43453a053fd29bcb575dd58a2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM6N22440669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793670eb68a12a13d42c93b4806c50823c3c72c5ec728687e12e4731b437486f. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QMBZ92565655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96c1cf738c7fc737c73e0907812c655d591ed6a49919cb43b8d5aba51f480aa. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QMDA62568283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb13b85eac4d43714206898b193255ddfe4cde845c6bedb8ea4a11a6f3d02358. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:27:04Z), 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/QMFMF2574994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d69b85c2ed1ca9be6fad83a81cfac51198f607181d54da2c3a44a83984636ad. 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/GX8KD2225270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aaa60ce9ed2330fdf63c40a49fc788a645b3ef9432f5bb0a90e7ba6cc88420a. 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/QZDA62230465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bff358fa699e0e8357b3ce2174c0fc01b7bebaa7046bb75368a20e461daad7e. 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/ES75E2203978.