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 0xa502944b0494b38a39f70dcc59ba21fc1315f70e8755ff5101a38dfe0e303db0. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a559d4ec-ef54-442a-8ce2-a342461561e6.json and https://artists.proofprofile.net/proofs/artist/a559d4ec-ef54-442a-8ce2-a342461561e6.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 0x09ae613475a33fe676bad8967dd7cb994cb9f20f71c9931302aa8e244a8ccfb4. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTBF2426028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702f225c4b5cd7de25c1d2bf922a81d87a8b3e41e64012c7bebefd87eabd465a. 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/QZTBF2426030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366d5df9386df356b329ac9958d7a3eabdd84b9ad191c922012601ceef593529. 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/QZTBF2426031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ad0128acc3d421ccb2b250fb7b41b68aeacf41a8467001bf707a780a29a99d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTBF2426032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06927866af59dad1deec196bf6dfac725a73a68621fdfbb938a909411762ed9a. 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/QZTBF2426033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7170ca737bc0a9dd788118249ba8115875c243c5e22bd0795dd399b621cbd626. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTBF2426034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f6d07ee897cd0cdb861444d25464cedb0b50c10620acf47a8e9820a2551f5f. 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/QZTBF2426035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e829379a79c1287422e984fbc2e8d39cbfd8af23d012aa8e040914b021e0a7e. 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/QZTBF2426036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fdfb9ecbb25cdaeaaa742650d1427b8ea0fa52693838f455fd1070b437543a. 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/QZTBF2426037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa844f52b5bcef206f23a4f29bdbeb99956c3c367437081710f75a6677eb24cc5. 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/QZTBF2426038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03ef34421f1d0a3fad500ceb0fdf205968911f73eb1fd9d04c3d2ba90f9ead3. 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/QZTBF2426039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89573245a6959df3d559c9d310d049d697ba94270013181c08d37f343e5ab1f5. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTBF2426040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785da72b5f6ffefdbcd5a4adcd63891da5d84c09262e8bea2c3413e76b0b5c4a. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/QZTBF2426041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d91337780afadde9d303fd551aa6698975b105d6bcd423c83a259c9e0d76ab. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTBF2426042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aabaad1f68316f2e21bf0fc37d43895ab9e66edb788b469e2ee5fde0b1bbf9. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZTBF2426043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b84843307ac295fb4a4b0b1f9e889d3743e4aa127632649878f92b58ab6703. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZTBF2426044.