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 0xf334929d54490b027e69fa4233f113ae6b6cad932d2259c79b3a3f6d238500ab. 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/ec44831b-2541-4670-80ad-27517cf39289.json and https://artists.proofprofile.net/proofs/artist/ec44831b-2541-4670-80ad-27517cf39289.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 0x45f45aae602be3e43b13b5c423ce485c608f00e002eaab828800a4b31533cdd0. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZFZ21977527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88963b3d3fffbc1f4f015154628aefa18282b9fd4f13b11993f42b4eb6131081. 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/QZFYX2180080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf002c370b13497a79154e3e49e6aa9724fb5dabfb5fe9f5fa38f216111e0b017. 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/QZDA62291792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7222d3c268645f8bfe3da20fe48ee40681ef83de2a6d4076ce28b4aa646bcabf. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZK6F2208930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba03aed8db06d12657dad2733cc88fae2f1d3d01602a4cd528f5e1626b703c9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWW2315057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a2e49c3a8f8c7ef365dcfe502ec0aa94122746c5e7f45f1ce4ae4e287ca070. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZTB22336060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7417949c5be8a32610a68a2bb85ae5e7cfd9aba75ffc1a29eb66f9fdc684fb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6P2495958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ad50ae85e4e73728527d4cb2584c0beea026410847a77818f42703c0d3ab2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBF2461351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b1f9309cf9229bbe8e2aaabff3929013351365bbac9442309abd9eb56c5121. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFU2449650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2633a599bceda543d92b62fda280582e22b099577e051360a83ba1011a88c8f4. 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/QZZ7K2400715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318d976e76f715831445075e19a56dedbaf3cf77bebdb9f8fe8d3c8f7a979ba6. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZZ7U2491929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11fd7407d7f12064f6059c38e46a3c004e9401c4d299b9c2b92952267faec71. 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/QZFYX2550507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5e3336c3353802d759ca9a3086344b415859db046de65b487dc5589050b710. 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/QZHN62554794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8421d080d411f7f500126850e442326ead722e37a12ff3b04f15656e9c1653c4. 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/QZK6Q2556492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ddc2afe27e2caf7ef1a0b3b2f3f9a40395653fe8e687cda6dfa85b70af5338. 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/QZNWQ2558095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eaed30346875836ee131c48a7841e9684800c86b01b17923db81e16a4327d07. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNWT2597930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3167b498ad65735a0ef0035b197b1739242c373e3ef16f7083663a5409c464f0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFE2542355.