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 0x4f68b7520b4867663e71a6a189be4b67c23080414fd11d342d16445605de03b3. 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/7f46e864-6082-476d-8ea0-7e9ce5049195.json and https://artists.proofprofile.net/proofs/artist/7f46e864-6082-476d-8ea0-7e9ce5049195.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 0xbb4df2610f4469daafb3d8078563c813eb9ecb2359d427a6d2b5fceab53c9160. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:29:49Z), 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/QZNWW2360562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78351079f8d01c80c4b86910d99baeea116ed01626246ef68881710426dc3913. 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/QZNWW2360564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a581fd24417be11103ec472e93682ae6065af8e4413964b8d0c81e447654171. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:11:45Z), 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/QZNWV2369084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09bb86b0f506c86eca5a63d4814e898b75397a1c713a97db6ccea05b49ab486. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNWV2369089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d349cc1477aa5717371a2394cfb569dcf96d531b8919fd8b81c1aa8cc4a3ac. 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/QZFZ62472885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c6cd856edb6f822a15532a7b7090d4fcbe734cbfbcf2e26bacbf3c1c6b11cf. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZFZ62472887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6888b79c02c2164b53d8d3002e153d855f3ecdbc50d2be241126efe4bd650d. 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/QZFZ62472888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcbbcca3af3fc7b9e4f66d8de9b19a61ab07fdde66dc7dbd0f044d87d09ce6d. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:51:12Z), 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/QZHN62482958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ca0f8890a5fc7eaed9665525d5192c30dda2efd16fd89304cfb9457b1cf0ea. 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/QZHN72463503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb55b9cfc045aebbf17abf706dc539f444bfd6d16a93c14f5a406799a9d7b9f. 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/QZTAZ2438361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4392cc73b7510dbcb85ed991cb52c52bdd26bf5fed94f672f43b6bd4fbe91c1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:50:01Z), 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/QZTAZ2438365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8cfed19b714f06e77b294052d118b0a432257eed08474bacd309786478a736. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZWFV2465042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53dc81532b85578c756ea0f0bda345e1bbf4aa6ccb03e8bbbb7c2cf029195cab. 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/QZWFV2465045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa435cbbf45ea39be22e1e8d6b4fb0d1b224a26863a7bce7dada6d722b0c1e9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFYZ2575060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d30cc6edafb4ed047b06794037aa47c2098665a97a1c490a4b0426ec66f22f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFYZ2575059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc5788fad2c1c3541106a58888bc4858bb1685824e12a11379a2187596dec85. 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/QZFYZ2575062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde00f3aeea50cf9fe6884131d0217853cb6df4d7c8f8550d0546139304c061d5. 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/QZFYZ2575061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1a38ce178c393bcb9170d2446388cdc58521234dc8ffecb87594a85ae4ff10. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:02:00Z), 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/QZFYZ2575053.