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 0x3323b26a083d6e0c4c5a36549caa26587408cd38a1041f72f479e61fa5716037. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af14646a-0fc4-4a50-8d67-d4d0c8e8741f.json and https://artists.proofprofile.net/proofs/artist/af14646a-0fc4-4a50-8d67-d4d0c8e8741f.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 0x25b3f8f1399805006285ce31e8a0a6a2c6c429f4974a784b22c871c965edcaa8. 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/USQY51494427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42a1378486af9a8e3d0f866bd365f3b54626d896ceeeb88c938cb0450e29f86. 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/USQY51494428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e184bbe6a17d8ec335e6c3e688c240cdde5f43260935973b37d5a44b1319026. 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/USQY51494435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03627d356578894936a57cec5eee3c920ff7093aec6a68d5dbcb552bb98a3eab. 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/USQY51428712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fea1920e3ad66bde275671d295e5c73524df8ec132e7c8d2b6e9700ae535a8. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:53:21Z), 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/USQY51428713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3f944b85e28a792bc5f32212f377175c8df7af8cf4e76e1a4c0576824da5d8. 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/USQY51428714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ee82d79f5523ccb013402cda8d977168c37bad6258cd1848beba7985fcdacc. 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/USQY51428716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f71f1f9292a19f513b29e9f6c0dc38cacd3246965826da206ea34eaaaf7dba. 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/USQY51414578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb808edc4bce5f23ad089db1fb5f92d3aa76f8a80bac0597f524c9e3a456b08e5. 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/USQY51414581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafc413f1cc8af7880f433b860480d32ff4e665e31f542a63a67a6e9d8bafc17. 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/USQY51415110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a28168b9d5786dc4591751873b8969a4f323c573cae3a2696bd59e5f4c378b. 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/USA2P1298175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bb8066b314a654ce6a6641a755d3e37dd10f6db14af013774c7a6d7bf60b71. 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/USA2P1601698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9552084ff0fb7985625e8d1f6f813d393b5e0549e303fd9d878953fd91176a8. 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/USA2P1601699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6694359e766ec3561eaa943c74babef07c82256e5154f8cddad82b969db4ef. 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/USA2P1601701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3042fc14e36655c9d0e7029af2d27c59a5e37471dafce936b120597ebb3e14. 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/USA2P1601702.