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 0xa092bff6b8a3bcdb0819d9241dbac91a8fa9de0870ba40ae4278b85f8b39c67e. 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/780c6570-a629-4523-ae0d-03ed63dd4060.json and https://artists.proofprofile.net/proofs/artist/780c6570-a629-4523-ae0d-03ed63dd4060.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 0x1a670f9af6f74533ce369350fa53def08ce3834b9da0809503e27b03b443e6ae. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US43C1619745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7916af982fc2755f2385add517400ed157e644c357febff6e2e2cda434d6c4e2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US43C1629176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade95a63ef963ebca7bcd49e9cc5127db2bed69253325c043e101fbfa41a920e. 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/US43C1625340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7424bb5ef983d54c78ae21dfae8c96ef4add2ba75fae0f40ec06b111c68e1843. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/US43C1627141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525c7882aefcaf9ef35ed1ce4d948a1f43c2e8893b2035ee4e4169ab31d9670c. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/US43C1627144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc60262d8d5d95805cc8cc68e3cea2a28eb0670c0610997d8ab8d7e4afe7a2e5. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/US43C1626720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f21211087127254959661b740b58c40f128c5f089258d19fdeb1f25f93d1d44. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US43C1627924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c05570631e6895dfd80a461e44bdc4d62515e4432dcac5a904632b3b210405. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/US43C1628437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb10c39cedcd6439a967d494b22f7bf59fd62e74ef51038500e0889f467e4013. 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/US43C1628748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc641741e0cf9bba232ef34fe4ccc1ed3421c402b0c7e1a8b8c9579058cecf9. 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/US43C1627921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91811e12aed851cc826f95246324593c44dfdbba283f3be4cb1f203c56295b8. 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/US43C1628746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36f92849bf24d6babbe6e86eac1e66a99f0488cde05fcd8487f4a063f3cf67d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US43C1628439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8fc3634fc7803c0edd1a083534bd7eeab4e499159cee25d06be50237833b88. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USA2P2418718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c29b5979adf1674a115afb69325bcdf4a473652d8d44ac560f05da7ecaec4f. 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/USA2P2418719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abd56cb478a3f2d4553faa180355fba66d98227254da4e59d595a1db03fd82e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USA2P2418720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d464e3603ab7bef56f2dcd61f42aad59b4a8493e855d58143b25ad5fc57d2d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USA2P2532949.