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 0xfc54e0f1a3ecace8b0f2f58646aa25f164f120fc1e5a7feca3f4225e7fc78b66. 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/aa340f24-f6ae-4e59-932c-c9bf19634858.json and https://artists.proofprofile.net/proofs/artist/aa340f24-f6ae-4e59-932c-c9bf19634858.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 0xf1a4e8ee95e32adafd8fc17be0597d68893dd9ce2eac96114cb7f70b15cb1f16. 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/QZDA61866914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71adf33426ab6f3e57ea80b5b95475cbf5a4e230c79254d38899fdeffb5b8e04. 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/QZDA61866917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e46ad3eb63559188128d2648527e3454cbb7a9355df4973cb9e16abd807621. 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/QZDA61935602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434a0448c5a0514f784c77bbea2f6a549d8448ec71530fa595eafa92c7f180aa. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZDA61935603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1dac07458c2a8ce5b6280fef484eb6f8253aaecfeb9776e60279d64784cd178. 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/QZES82041201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fbdf6a47a51b991c07b84b473292c8ef88f29501823c61afa1a607a5208067. 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/QZNWZ2085233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9badac121d08f49ac47e6dc7408a57642bb86a3ea1f5f41dd73d794bfc36953f. 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/QZFZ32380172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8cce90507433f48acc7c305e13b72b4ba3e58bd2f1fce3550fbea6df551871. 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/QZFZ32380173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d94b19e0f0347c57422bb673b9295f9d98695cc1541c60f75b6fb1a30936b6d. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/QZFZ32380174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcda01198b46800fce2d05ec39e922dfeea69a2dc8ef8e30c7f5bfc511d99b6e. 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/QZFZ32380176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4120cfeb57f3a5ec6cf6be10de5baa5040f702a7fb558e1ce4fd4020b83276. 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/QZFZ32380177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6fe67715a93a24de5bbc80fc4f66466dc1eb8c2a2f32577912beb26b68d0b0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2360545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdddcf9c0499e8bbf9e6059bf521fdf2fdc99820bea27ec11a6f6c36db806b8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US2642454905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdddcf9c0499e8bbf9e6059bf521fdf2fdc99820bea27ec11a6f6c36db806b8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US2642454905.