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 0x88a8a3d72a904b5f3a4f2eef878133511bef1d13edc50a997d85e31880c91566. 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/029a8c99-4b5c-48e9-b045-df0d3ee1f95e.json and https://artists.proofprofile.net/proofs/artist/029a8c99-4b5c-48e9-b045-df0d3ee1f95e.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 0xae4fe87c0c4c9b4048cab39dcadf222af81a623426e100044605545300481fa1. 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/QZK6J2278139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784df722a9a24542febbc791a0430a056a42eca63010fdfe92a8916f82588bba. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYX2374647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a679a33b767feb00744b8d5a9e18733a8ddbf9d302f3d38aa1edab390aba50c. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZFYX2374650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae5a5ef2f338bb4067bcf85cc6794aee25dc978fc9183238bb3b6ddd013e12c. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZFYX2374651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d78fbbd591e7f64fc8155b4e95822189c7adb84056790a01538c4e50d924341. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFYX2374653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8468eb7b1a4fddd8a5479d9b57544558bd5198dfeddd6daf87256a99e1e416d7. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZTAT2329992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb194f42d3937631e1fbe995c1219541b1038279fd59d7c2ff8a180f6b2f74bef. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZFYY2457263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc734c0aa137e63f66942d7023616eb0209037876342abf861b7fb6cc688f36da. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZDA82409450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3aef03cd903a411eaa2eb4d000d670f4c5337ecf2d1f7b0ac51a7a381158ea. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/QZDA52453128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78b8e4441873dec26af525eddc21c9186593eedaa92a0966f7f3b933d46c40d. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZDA82409458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0deeecc8ae343a00fd81a25cd5e80677a027c9d05ecbfcae2705022610490e3. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZES72499324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdad40beef74b6a5fa97944578ebc2544e9a0c09fada18ab733c618daaf42ce4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6N2463692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49756ba5fb85cfa78d7aadb3b15db382069cf7ed16322f59c4a0e62fafbaa7d7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6L2453781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e348d8fd926d17e537e8c4e763c21ac26910b3e404e66401ab9e09e67f3646. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZPLS2469649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b76fc64f37d745febb0bf95ded71c387bbeaed1731b9a0b1c006d1792ec036. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZRP42482355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4b676b9fcd49f42aeabc86669a8cc03d0b5951d854516df5491d3db2b8f227. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTB32474874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9010d0115ae8023955738c10f0a7a51fbeba5f93d2b933d9015f836deacf634b. 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/QZTBC2479295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bd30c11c5a94b82203c7d064427290214da0f2805c9181cf2fadee5b49e13e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFF2495715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456fcc5f9cb2ffb257a592b7a6146d17c62807abdb463c9b4ec170c8117a63e4. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZZ7L2455181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b910d5c3820782d3e3f37988cb9c5e8c1d733168ad91c889e5a2fbae44cd01. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZZ772441878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe234d1964e3fcf4eddaadb749bf1508510045f98e7985b5e6e3929fe2ef35f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZFZ22533206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6421d4226294c3449157a7339b377f7e3dca155740a0e3f716779383507973. 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/QZFZ72580442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5609d8b2f9fdbe62034b54084d6f47c0e9ddde3ad19d608c7650b36cbf33eb12. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES52521232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3899f17b755e348b28b31f9018143d70c4ebde11db5b169f3a436e72c9ee45e9. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZES72565603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef17249d6e024daa10a64b2cdc9017f47c750e50d710cd3b3c37e762177f9a9d. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZK6L2536856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bd30c11c5a94b82203c7d064427290214da0f2805c9181cf2fadee5b49e13e. 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/QZWFF2495715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb275a720727072830e1882c4c28ce0e2ff82e7e2250629ce90fab51c2443d51d. 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/QZNWT2504184.