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 0x514f812075a32e265744427e6bbcddaaf4c69cfbcd28e82bae0c6c288fefd1d2. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e160e7fa-e892-49ca-96ae-ad12de289cd1.json and https://artists.proofprofile.net/proofs/artist/e160e7fa-e892-49ca-96ae-ad12de289cd1.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 0x5a784d1c6d3b09cb11fbb0ab2b6e98d70146af2ce9819ca33137e8716c382326. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/TWAH79400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb449f1a60844ed2fd254194feb77ea90f33e8670ad3bc015c551f5271e2e7f. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TWAH79400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2cb5f5a0b943cd34fb09682000b2f6a04820e472d3a767148a885012b0a806. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TWAH79400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fe747ba5003bc1a22fd6d71bd1a43a64439027e2de395eb0c1a76c13fe8d79. 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/TWAH79400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145c84550f2213fd67e60fcb50f8bb25681a563b3f9b6623d4c3cfdfd648776d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:09:13Z), 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/TWAH79400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69766729ee6f6edb70e9b156ba919b65e0b0cafe1a06c3f061e7719fcf857cae. 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/TWAH79400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68da851c446abd0ae7c3029bd8a8f38b01a98aa2c8493cdb035a7270e856f5f2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TWAH79400110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e640880766bb700128632723c4145797d0bfaf6796f02e7e95abb972c99015. 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/TWAH79400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b753da685a942e995c732993e810c8cb594a7b4062a4ebe2a80c2e6e854cb5. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:12:07Z), 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/TWAH79400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47a400f4a0921f3593f5b1331e3c928c15b580620950c09ee67528bf9e29ba0. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TWAH79500202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd126111547aae844c5fb664c25edbca75442cb60f722a93a09496dc1f75d087. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TWAH79500203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee4bb79cd7e6c131048dec915e3803a523f2049369519013024e2d321338181. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:18:45Z), 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/TWAH79500204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa81653046f5e5b658e73047aa25bbb7b8a7ec0c9cd2ac45150bedadd2b6e8fe. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TWAH79500209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdae68f95e66d041f1e1d69311e7adf62669e7e95a85710b3fba007383496b2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TWAH79500212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b7aead4fed79449046b9a733e37e1eb1312569538ee047ac91acdf17229883. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TWE771888058.