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 0x73b9dcb32d517cc8a9471b2aa143e6bed5694e6382c37e2c751b454cf39cc4f4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca68b935-1ff3-4801-865b-87e4300ca7dc.json and https://artists.proofprofile.net/proofs/artist/ca68b935-1ff3-4801-865b-87e4300ca7dc.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 0x222b6e3d5394578b02afea698f216cfa85a7ba1098b0d236a2f91b5769e0eb61. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZS632226647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb697701b2f63c8939be137e7d66ec1ef7bee46ccddc7a748b8353c917453810. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NL1ZN2402803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdaf565c64f4d712264c4c64c987bfc0286109532223c542ea69a33b813697d. 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/USLQ22100984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66128d02f0bc78056dceae3b44535bc57aba785662920c4a3a200fb5c2163042. 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/PLI366635630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33bcde90ae595c1016b3c3dfdde63a6356f55ff4c2ff91fa8f8a61cfc6dc17f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/PLI361534150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3537e16afc6c67f615a20ed1e09b56c923b0608e099475f9f81cb37b92a4b9c7. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/PLI369910470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f2c7de46d8e1a064c251ddcf5ef6a4404848d880f6f99b222f3188b4e13b97. 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/PLI366902190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd654b46594c40c2499e4e4b6c4af48805eaf38425edbf68da103ec1907ee92. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PLI366922720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222b6e3d5394578b02afea698f216cfa85a7ba1098b0d236a2f91b5769e0eb61. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZS632226647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6160a20dd7f13b20b3c56ead0243c0008c2b944ea43c9006ec4fe407ae6e5ac6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/PLX632000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb2708cc7c4256672ff6ceeed6cd5b529e6a70718c79326ea3bc8ad5a49a90b. 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/PLX631900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0c4ece8e5c6519c5ac997243d9c988d23e2cb8dabcb6fd9984900b8b307029. 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/PLB382400575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa640d781a5bf76397603d2e5bf4ae47c3caa654aab455eb47243a9736119c5b0. 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/PLB382400307.