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 0xb670bf5679d360d2f58e56f148342ec9f990e65077e16be71aa71256d7bb272e. 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/ed80f4b6-d6f1-4444-bd53-b0fd3ed2b921.json and https://artists.proofprofile.net/proofs/artist/ed80f4b6-d6f1-4444-bd53-b0fd3ed2b921.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 0xea3a7f6c8e297a4405d61ec9b81757dd10324f8a542031763758a6cffb1163bc. 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/BR8DU1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bce483c6928645944fbd2f6a61393098ea7353624d11ed47123d5037a64c1c. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/BRLQ42100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0637ea0262e9890d589ef68dd556b2bb5fba1c520482000381ff2ab98a067d1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/BR8DU2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74eafa732f5b48e59b83201c1c02c0b8fed7bfe55e6e5cb056ab302695560c98. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T03:00:51Z), 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/BR8DU2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00c3086df38354759e9b46d670cb78fb7165d82e4ba5d513dd55477a5f27545. 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/BR8DU2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd02a06eacd22f47a4a122cf96bab4673379626c5948e4480a6ae8b54186903. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/BR8DU2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74eafa732f5b48e59b83201c1c02c0b8fed7bfe55e6e5cb056ab302695560c98. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/BR8DU2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0637ea0262e9890d589ef68dd556b2bb5fba1c520482000381ff2ab98a067d1. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/BR8DU2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0933b9872d849300de85e0465335f02933cdeaaa9dc7dfe5319448499680a2b8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:37:44Z), 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/BR8DU2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79761fc83e201bd36f433cc8f3e65c3bdfce94419b952c7650660b6da78077f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BX5J02100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b923b6676fa00023bfc41aab8ac329edbf44539efbdce33d50843b95b9ce57. 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/BXY672300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcce6808fbd94a87012b7f1ae98338cc2536e4b8b4939a52574f57e4fae02388. 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/BRSME1300791.