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 0x3244fb6a53951d6407fe46f699a4245652565c02c513a0c9d545fddf8973ed57. 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/5dbdef74-47ef-4f15-a676-9028c8714ebf.json and https://artists.proofprofile.net/proofs/artist/5dbdef74-47ef-4f15-a676-9028c8714ebf.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 0xa8a2c372b4123c47b4e51149f7d1a3c42d7b0f4cf8b584ddb4cd686f9253d3a1. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/US3DF2402224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f047bbfbbf85920536447dce3f1121d808e8c791a6afc15b408e3c670bf0db. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:53:15Z), 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/USANG2415997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c774c849dfa4af852576cf9dc46a5fc9b3520acf9d2ddbf8de3dc996fc6738. 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/USANG2415998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f57aaa1a9f5702defe4120b25e8e9e45b015df9290568aeae1c6ecfd0fd0d50. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USANG2519795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35213b6bb5969953c9f27d8bc0d5ef1552b530262799f02aa4c36915161f7849. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USANG2519796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e375ee7cdbebb5443819eb38f5e03abc0ac15cbf4de01e22311f8c4e143cfb9. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/USANG2519797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356447a7c6bfc85db9247fba2d37816b6b544330bdd785b7715f43b91402cba5. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/USANG2519798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fed0d87b433f10702f2b67292032cd55ab3faba822fafbf9765028bac74d566. 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/USANG2519799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5661bfbf9142bd2955eef884b3ccb3e61ffe6375386d9c9d5a2f6e500699c85. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USANG2519800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c063544f2c8a9e643358daf316e25e0aecc1c74ac2ed7f0f5ab4cabdfc9ba4. 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/US3DF2271491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b2a72fc836f62785dd12671ccb5129350cf45adaa17d1d71de86502ea95b21. 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/USANG2421598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde937f6dfdb4509965bce5bc336d940919b8ec9da23bca2be4892b7ae48a19a9. 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/US3DF2476653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cf2e3758ac4752103ef01c2396f8afbf13de1824f03c9faf3267fe99d9945e. 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/QZGLS2524686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014ef069259a70a60b9a8ab729df38e93a2464268ba89d6f5a66d4ff70d2e6e9. 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/QZHZ62077800.