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 0xa7fb61650d7910f0e8c7aff4f091bcf1bde744b40430d7be180c570ff44f9c31. 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/b32034b5-5940-4689-82ec-22e3aceb1c92.json and https://artists.proofprofile.net/proofs/artist/b32034b5-5940-4689-82ec-22e3aceb1c92.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 0x2ee4e2f130741afc1b50205f4f376a98ae106cd7308a6960fbaaf002b3a33147. 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/QMPKX1500755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1644089926f0889a63b38e7077bb18a857093135cd30ae52a356fab16c81bb. 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/ZAQR41702829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c06bcacc656851a5b660aa3009f1da25262f78d87fdc051dbad1dd0e1c14e6. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/ZAQR41702833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac6684a3b6275db5d2e0b9a86ae977f29a113d215e6398f0707c1f737d41ccd. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ZAQR41702835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4665c9b2095d2fc71918254f6efd33632b4749d148656c51bf07567c5b5b0d18. 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/ZAQR41702841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e11b9dce810f438f04f302132c49bc5054ce9df08b582aa1a3a20338e2a106. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZDA71857484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636019d0f4a6f0bc96238539e424a59965f1d1f74db6960b722815df1d4b608c. 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/ZAQR42004318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b2606995a8f2fe5ba9bfe329617d18d3e90172a3695bf5c6d492bbb78a4749. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ZAQR42004319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b784ffda8f9bac707d6ed19125b32f13713a5ad51d54b6aece3c44e0233615. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ZAQR42004320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2906c81dbd5da3ca08f385332883e2168ae9a8c8549fd7780ffbe7ba78b6b2e. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/ZAQR42004322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35eb8d4dea2ee0b873ec0ddeb23692ec0aa6681659af7ed8b65d349a5d3535e9. 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/ZAQR42004323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8384ddb6a15a61034a3274259f5ad2eab9a0deb2f2fd3b412416e1082255c253. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ZAQR42004328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff7d5301a35bfcac65c23e69b96896d0ff65f0736924beb5f30668909fdfae0. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/ZAQR42204743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f53b9b5b8029a51995d61668862bf51b3748fc0fc53577590b4003f61b18148. 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/ZAQR42204744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9ab59049f97b2e30168d38a724e28fda49edf533905175693a73475c9fb2c5. 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/ZAQR42204745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d3d60d1a68362ee4cc72b4c72558c62e730cbf3bfd883739dd4e0c357b6933. 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/ZAQR42300597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d3d60d1a68362ee4cc72b4c72558c62e730cbf3bfd883739dd4e0c357b6933. 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/ZAQR42300597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088e50589d1931d72b70170bdd4f12ad0d033843d4b6aad49e83669656549ea7. 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/ZAQR42401002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2fc0a5e3963c639b4fa4c28234eae476818096b12185e8c12e514be3521ffd. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ZAQR41803328.