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 0x01bab06f9ad6d4d800def19468a8d16456e762014c32a3e8194ae107c7969801. 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/d49562eb-4036-4daa-85f6-5a3c69fcc7a6.json and https://artists.proofprofile.net/proofs/artist/d49562eb-4036-4daa-85f6-5a3c69fcc7a6.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 0xfc205ae769fc05bd2f45046389d793bb0441cf2ebda45054ba878ceec2e1fd04. 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/QZDA82560697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1c7a539ceeaeaef0f4c8ee636bc8de1d839a5c336eb7438009ca5f91f059f6. 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/QZDA82560696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0460cb506eb4fb9d840b6a23a0a40d41e51342af6984c39726c3068ee199e55c. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZDA82560711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5440da5978d34624ccb88af6bc1602c3cc997127df46d27a7fdab23998d1f752. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZDA82579334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd772265bf21da4d93deba0adba820faa4db4f48f7e70c575c777dbca5f88f7. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES52541660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6903115fa15472936e49a4fba5a7a2d9c93b7c0fc151969d997a124e762ebf. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZES52582831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c23a47622e7872c520e72560d5a518a9594dabf0612e70d31590d072edb8023. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZES62566214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987801ed17f6016aa5d172655a56384f9ad0c95b2ca8a309abb95b0a30360378. 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/QZHN62542199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd64b5587e0b39049596449655002c3991286dbd9ab52968618401b1b6d72cd5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZHN92547598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83aa75cb15020fe7f00f68c296d306e2b19171a8c8893aa9dd23aea1b9c6ce67. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTAT2589883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3dcf9bb67c6dc003ce41e50b21103ba7a26ad378ec0bc0c2604868fa2f7ff84. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB72575454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f351caefb9e7df999a73716d36796ba58a6d2c41997f6a65757e0c80fb0885d. 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/QZWFR2520684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86685437e77cba3be8f3ff1a70ac58a665a91a8d736762574b47dafcb7ed7fd9. 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/QT3F92577118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5395d2ff4408fe6c84884f81ce5de27b9197ef82337c3a013f9b7bcc6a2eb568. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3F92561929.