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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 0x55a178e350e1b3fb613e6b8393df02ccfd7d041d4e980b5550d17d7652d82270. 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/e9b850e0-8a58-4f75-ad17-49c0c8221488.json and https://artists.proofprofile.net/proofs/artist/e9b850e0-8a58-4f75-ad17-49c0c8221488.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 0x47efe35ed9f6198a3d5f6bec7df0065a89da2c56e8265d6d458229259efdbd7a. 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/QZES92370679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0c3de50b19ccd168f47d6d2b40205a980f897b79c8126bcd0ca09a385ad8ec. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES92370681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135fa47c3b4b204da3a81a7fc4c2872e477b28333ad5a68baa58a8c2d018df35. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZES92370683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387e019b716e38565d753d8c068af39e57fe59ea18989bb1a88b7b02ea8a7e17. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES92370685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52d59a6093328e39dde7ad5568f1ec830bea471efd34f8681647de2c82498ea. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZES92370686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04b38d6cc2ec21b99b1212c68bc5b7505b45079d74539977fed3c9c780a5c1a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZES92370687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2799adafd04e99b8143d4b01c954e661f80a28f1904e43d59ed3330c11fa2b. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZES92370688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100fdf9be368b93e4369fa3787969400fed675005fb7e9f9d01cb51145887bd5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZES92370691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53be9ef7e477c16c9fecc069624cc280910ab055daaa2231038067c0d216ae95. 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/QZPLR2330831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736633889b13c8478c2c66a5b7cb23415c770290f2f415370ec90a8e82666b22. 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/QZTB62311925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25ff0b4bbc9a5df988b5bde55ef0d9379b38accf662c56aa2862325d0d2273f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZRP42489430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191aafe376cfd1fd70870c7f87380b953002cc3f1f4b74cea68989ca9e9f4e96. Chain 2 (Bitcoin): anchored in block 957596 (2026-07-11T18:43:56Z), 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/QZRP42489431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5c1cc992f11066bbab3168651bd5169a5fe49a46e48fdc113cab927b08bd4f. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZRP42489434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6879129d0900a2a1af15ad098bc478dc6d1f6934c056254a96c43d325d1f4314. 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/QZRP42489437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc695b1c02423f76cd6b0c6271681195169fbab436ed23dd28ebd01b92dc8ce62. 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/QZRP42489439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c3f421f21637cc389fe66e63426ac0a7929dc3861e46f8cbcf36675bd35606. 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/QZRP42489440.