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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 0xc4e2cad200998f86f8706f4cece153dad8b8ec3022f0723d92e6fe08b63139d4. 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/78b0a897-600a-4573-aaab-e548b8966648.json and https://artists.proofprofile.net/proofs/artist/78b0a897-600a-4573-aaab-e548b8966648.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 0x40da07e3fa446443e731b8b4f5745b5471b03468b401d69477f96cc4abd0349f. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/NOAPI1398924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4ec7d62e9e6b94f1787f3f95c2339f4666a2a048f5bd9b98f2dfaeff5976ab. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/NOAPI1398925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ef1d204854bfedf293f9ba8e6faaf6d57b25371d98bc30446453370ddccfa2. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/NOAPI1398934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab598d42dfbe97f9599b1a57b69cd524f7820f93efbe9b432c4a50ca757ba9f. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/NOAPI1398909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245bac265840c90ff9f309d7c939b20ebbf819595543f9bd20516e072356703f. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/NOAPI1398910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0290ddb7b433ed7bc4cd0afc9a0913e610696e186c0236ddecc54de99f47822. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NOAPI1398913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803d1aed2979b246208e7391ec2d6731671b02ff95ceb8088abada0d29e4f5a6. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/NOAPI1398914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e82d4d6a72746ea6bd318bb69b9e14f1f463252abc931faa66a2db45312573. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NOAPI1398915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f4f8d0e8414aced27f5d53c2721b736c9dbdfe2b10e86d16a60e7e209f81e7. 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/NOAPI1398918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce7cd21a9bb567ce4ca50101a8e9f141c365c493ffed2e080aea5bd46366762. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/NOAPI1398920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaff111a0297a4cd28ba814cdf1102e1efb8980f7c447dd8ed8acfa38e17dc17. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NOAPI1692525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb318a453433731f387b61dcb424861937801d7f595b94e7b990ef7508e8d44. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/NOAPI1692527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d49fc866fa2b86e1309fa8a21d3f44272c80b36fad9d7be2e7d02e128f49a2. 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/NOAPI1692528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4456bc1da6bf1132df01874f1648986661c46a36b13fa9c5331ddffb34f95435. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/NOAPI1692535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450972314870398b7b51e0021c2ba6ae21fc3e481a01b31b4e041959dae9f223. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOAPI1692537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cd130b790f3fd86053e7b97ffcb5c7bc3057b9788edafa16b3cfe040651e47. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USUYG1581917.