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 0x5a4eb8e0ff69939ea9cd05e6fea514cd0e96e7119327e9b09e75da29dc424828. 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/0a091a2d-ac41-4d5f-8f65-f966e5f23a03.json and https://artists.proofprofile.net/proofs/artist/0a091a2d-ac41-4d5f-8f65-f966e5f23a03.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 0xab31c1758f1d2210c757461565ddf3578394cc98fdfcd5631c36dc58285afa42. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEW271313111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d927156f0f297b57e60736feec1720307ba96a1c6794f01e73ef74ff6939061. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/DEW271327125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab31c1758f1d2210c757461565ddf3578394cc98fdfcd5631c36dc58285afa42. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/DEW271313111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1384672ba9d8c8bfef4738a439635c451b30b182622b0ec2ed2f5a78850e32. 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/DEW271327133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27daebe80af4c1056085744ae9fa78fdfbcb98c41fa7c0547099748c361f4825. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DEW271313115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fd40a6d9e3c96e59fe7a9e13650c96ac40f1ca377cc48c487f9eff4ac58c96. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEW271333340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978f3521c32b457925f1b4986de12109fd6e87e8a0738f025fda6620ec7246e7. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEW272104090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fd40a6d9e3c96e59fe7a9e13650c96ac40f1ca377cc48c487f9eff4ac58c96. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/DEW271333340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffc8db6f318700b112ea2168d7e82611b26a1c71036ecc0f8c9e92afba58bd5. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DEW272104068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3239dd5882d5917713fc2a265a5142d5996805ac46d1bce210e29811dd38ebdc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEW271227139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978f3521c32b457925f1b4986de12109fd6e87e8a0738f025fda6620ec7246e7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEW272104090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320de8b1a20317a5100d5b26bae09d398c0098e7e63fd3eb4072d6f519c8cd8d. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/DEW272202177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521f7f9d67011850b1178ed2fbdca4dd22da4f7c96133ec905f205878eeef6f4. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/DEW272202178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7311f604aae666433e89b7fa5d534e0c6d801c3763b48f3018180a4a1593851. 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/DEW272400276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79a25de8834bd01e06deea4fe8db7abe4a0ffbcd9f1f2d6948b169497fee394. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEW272400275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb906cb1625381a61b3a714a41a39301ef1b87f3db70091d1aeed9d7da4a8f428. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEW272400285.