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 0xc0ae7de02d3b65e2f951a1b9b7a1a8396a5dc9996b4d153afa66c66514c98e68. 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/cddb1de2-65e3-4f22-ae4b-a0910cab79f6.json and https://artists.proofprofile.net/proofs/artist/cddb1de2-65e3-4f22-ae4b-a0910cab79f6.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 0x064b40468b8a61b62cea0504c86a1405b8ff51e2a252cb100ca6cb50cf4978e9. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/TCADL1807775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3742ba9387010c2adf1b0f92ebf475656d7bd6ce258b1690b1afe963f317913f. 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/TCADL1807719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65966fd516766e770f4338b2d61e049e08675a6d2838b88b2b36fde794b3c600. 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/TCADL1807723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d690bda4bb72ebaa19d848efd4f27d0081ee1ae68f32aad8018a9a9dee94e7. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TCADL1807727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00a28a0eb0a68d1337c75e86382343449949e17c729451e14edd140da08d595. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCADL1837925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85b1432d9e3b631c4baa2aee823e57ee255dda632845b2b59a3ab68580df219. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCADL1807731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ea95cf014928b11240572606fadc9a4d9914ad01335f7bfb47f21a5d69467c. 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/TCADM1822830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7fee45bf6891d42e1d4939978a867445aa044df463bce953440e13bd4d0703. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TCADL1807733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783d7d828c9364c60d7eb5ccd5b3ac87ab6b535486357478232b983b2cf8abdf. 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/QM24S2303931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55be6c8cc5c03820d04b82dd43ca0981240aec3355057cdaf82b2a2ab88b2a1e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFYZ2395242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc25293deec1b87ecdefeb553f89037a256765515cb34b81944dc1db5028789. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHNA2076106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6346b1f3497251859ac5169f8c52dcd5bad1dfeb598141ed2fbb55e5d2427f9. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZHNA2076108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf5913b81e298e530391f67baeb5fac6ded9ffc71f9f85d8b41d61a7c3b239c. 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/QM24S2004426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad798c851d423b0fdde51a444df1bd7325a8d19f983ca23706e3fea1e55774dc. 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/QM24S2004427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26cbfa486dbc7db346aa3d5b9055b347fb0ed0ff477885a3384201cb9e967b1. 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/QZDA72080306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7a426d71fd54ff5e0e160e4bdf9740521587f5ec665a64472707c5a499a066. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZFZ52050786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf26c778d7d517980bc76a7b15f927e9b6a79659c2d4a1645ca102157e15990. 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/QM24S2000437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d56c309f796e7204c7a6e1b0192bfb22c894cdb4b73276bb247bb407a8ad743. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZK6N1997899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fd50e8a846e0a31d83cf2c6b08b23eb59f2d27c91ffff83a5766bfdf3a1f21. 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/QZHNA1917922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06175776d1e51f91391ffb161d8a539aa3527cd2c1ea695bc0376ed794087da8. 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/QM24S1923059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a7bf6a02c5fe4c49c1c8f4b28c92f57ba1ddefd53f6f12ce520dd6cc4e94e4. 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/QZES61971880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecef425a856ef96a8c6c18ce3ac9ce0088a2bbcbe0d0fce088edabde3b27638d. 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/QM24S1909877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7f2c79df799db7ea973363aed10d6c0f39f9fd054f7fedb1fc85c3af5b23f0. 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/QM24S1842570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04691dd6f5d154fa8a862b724c738086cbcc8315b1c0139eb2392cda2948c04. 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/QM2PV1834677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ddeeb6823b24151f5e11de339b587c4a38769ba583b4a5241add5878b840a2. 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/QZDA61844575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b059fc84c401ca46b212ab8d1d3719d0a3cf8c68fedd3f5afb6960fb49a1bae. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/TCACY1729850.