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 0xf3715e753b51e82658bf4d4e1c972e64a11d00225cca5472c444ac3a795250ae. 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/cd5ab0ee-66f6-4eae-84f8-21fca7db51ac.json and https://artists.proofprofile.net/proofs/artist/cd5ab0ee-66f6-4eae-84f8-21fca7db51ac.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 0x2f2d1026c5ca4c07dfb1b07320ae474704e6fed961dd254906b9fbb97b7a713c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAIY2421660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f45d0bb58c792d662150047e5d8816a7d3d314381276878b890e6aebbc0473. 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/TCAIY2421662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462ca7bb0eb925317d778b4c1b1abeb596b1e7151e7bee267c5361e64de97dd9. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAIY2421663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7f6c01522a3f3ba2b95c9be95f4f5aea423a8be4a23aac3e7d4c50b5d386e8. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAIY2421665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279e5c0bdf6ecee6f48c9ad65b1423824dd968bc31322869443b31a99ed0b548. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAIY2421669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277f716b5fc8ed090f75a1043ab09e52205dcb0d0c3c1c0a4beca683564f5f55. 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/TCAIY2421672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb490ee760a311de5f80ca1f06053e53e306bfa820a54243b8482e423051dc308. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/TCAIY2421673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8279767486a02dced3416c40856b4ec1c209f23656778690bc38925705cf62fb. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAIY2421675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb616422748e2343dc310aa2ff244f72790a891022f21dc81271b68ada5577e2. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/TCAIY2421681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab9806006e4d1b2b50ca495153b1cf951e52c867f000b8ffb408934a06661fd. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCAIZ2421682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505469bb0c7f10ab7ae1a46ef42223525c89adf1ab250bbfaf6364f8c99c4c70. 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/TCAIY2421683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0e8ed031bd3896e21273a23c7cf20cf16b91c5ba8b5112fad83cee05653398. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCAIY2421684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2346759c385f49ca834537619eb6bc0551fe33f2b834b6aaca9238c3ffa1a67. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAIY2421687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fa8d0ea447073f5945a6ac89c4462fc6e940ad636b5b85c8d712dafb7d6cab. 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/TCAIY2421688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ecae9265809713197ad43c08500e836ded06b6a08060fa7911b2d93fcd0d10. 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/TCAIY2421692.