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 0xd514639a6b1557a5b8a7995f888d2a90ac80596145e36854980213c3848892bc. 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/dfe501cf-1ac8-47f3-ae80-ab6c10dbaa1d.json and https://artists.proofprofile.net/proofs/artist/dfe501cf-1ac8-47f3-ae80-ab6c10dbaa1d.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 0xab654de3ccd76ed58105d91fed53c1f3711216c548905078e9b0fbb53e1d4e16. 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/QZTPX2482094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46a9e7c59fa9037f1aba7d914c3967d3f6e68268cd65711bb6648e49db563ae. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZ5AB2152446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c0d46597972a2577e89ab7244ae7a2fe13c726453a15d05cfdb7b607a0889e. 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/ES71G1721434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41885c9935628a52a508cee0c2e3833f350778240cc78a34e951e716e2425822. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHZ32284282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9861b33a7ea1fb43a3e40747183f065ec1ac0c95e97af3ce38b657768691ef. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USDY42323757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167d0595d7ff8343cb738f459a207ca39c9bf5273c1e6a8cc4b8400f8202e5f1. 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/QZ5AB2051705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a16fe473362ae789f6571b0a0a1015392c2de26df8241211360f4b8da7521c. 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/TCADR1859478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a6da47d8d7735816ac7e7968ffd5df2805cdb9f00f527d7ceb8958dc334b1f. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZGLM1963083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a42bea10fbb0dcb0a5b775c0efb7f5643085d5ce7d06ad1d2b76b1e1bb1acc. 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/TCADK1722421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc179b9e8e1331b2e82fe27b48a0e59ff32e8a8cd683c3da890635f63a967c5ed. 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/TCAEN1935124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f59615c011f03866cbccfd557606657c5a6bed2f3ad0eeeb4f90aafd43ed4b. 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/TCAEN1935187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1dd9f2408e332e186719097ca736fc24b3c594742a4990f63f144f807f515c5. 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/TCAEN1935222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4f1d296c0fe8df06c7b90bf88a081046338d57fab037517f491157f7393636. 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/TCAEN1935236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1686118d419d91dc5a10c6e00a06bab46799b5ee4b0c05cadef07ec7db3981f. 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/TCAEN1935271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c634d822e745237a4acc6ec9a96582f2fb39968f70e3314e321714e1c65d403. 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/TCAEN1935279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a6da47d8d7735816ac7e7968ffd5df2805cdb9f00f527d7ceb8958dc334b1f. 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/QZGLM1963083.