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 0x88f5b81782f5f0b51a37c18cdb7d56c2180e8c0260ff69a4c905b4e9dab2c270. 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/1d7fdc0c-7b71-4db3-931d-7b58e24d5275.json and https://artists.proofprofile.net/proofs/artist/1d7fdc0c-7b71-4db3-931d-7b58e24d5275.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 0x35ccbdb12964b2f8b9e8a5416355bb7dd3cc5f5eaf6b670b77584664e99639bf. 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/AEA0D2257911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7e944193ec38e3f9039556385571d7b9056e99e8632b1b8fee726a5fb69667. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/SMRUS0072651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b84cc3493111bc3fee3b461a85e413c123a6413feecd1e36a8fcd21f44e3e8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SMRUS0071010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656d6d5fd205345c600c2ebe5701e7abdcae19fe6415af98ea893ee03e78a893. 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/SMRUS0070533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314d68c41d61bb633f58ca9b6efb3b9de36241e48cc63f4cb9690e3d1c7f92c5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SMRUS0069865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ae1f4511704d8f605b30976aae2a8b20c462f5bafa90f8d75acc3aef76cd86. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SMRUS0068851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca39e588bbe7b8a0c7d3b09855ca465e4b6858c687fc4dbcd1f7eb0239be1e7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SMRUS0068628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2719c5d9f1ac8ee499b1300dae25d3de55dd7d9e4af207859ed3579c0cb0ce. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/RUA1H2161110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e52201d1df818b85eb312187bcb5d0493105a90bb8a8edb0883a4f37899d933. 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/AEA0D2020458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0613e882dbb11ed5914aa1bc702125546cfb4dc6bada8bdbcf6ac6868609621. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AEA0Q2093809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec8aff9b2e601d3616ef826fd3c985b99e4b7cfc1b24a349ab9c8ee3110a818. 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/AEA0Q2036229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab45cc72c77353d7cd24569b1fc1d47202430a97ad6192fd1eb9f2dcbbbde1c. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/AEA0Q2026421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f29c193544c0db7c9f905e8262e432ca08cd707a0bd103b9fa30a4d5a6d133a. 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/RUA1H2078669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea8cddf9c05e10eb93aeb45b93a82ce5d04ef996ce751464bdfd881dde6efe8. 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/RUA1H1925382.