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 0x5581da5d32d4d2ba4342c4c430c30bf4c81a2a460e4ea43667bf7d0f1798eec5. 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/631f2d01-3e3e-4d3f-b632-7e21d4af19a5.json and https://artists.proofprofile.net/proofs/artist/631f2d01-3e3e-4d3f-b632-7e21d4af19a5.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 0x0b4386a56acaffe5ffb1097288e69c84185e175d96440bcb0d6baa1530dacd73. 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/TLREW2221423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f12c1d9adca95dc1f493db89257daed6c83bea0517b96c6a8c7f601917bb81. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/TLREW2221425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b84b166773ec1957601abfb2993acc4c41eb8fcd4f07200331dcf9af05b1940. 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/TLREW2221426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb201ab28d3fe65aeb03beec73524118f3342b5b66b8cb04d459f87cd0e061b15. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TLREW2221427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72da76564dba7659fc8d463c367082bbd3aced11e9f10a263b8e5f90eca24ee. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TLREW2221388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8709b58625286baf613a55747a0656cbad68151c8fe4dc3f77b2e0c02410fdf2. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TLREW2221507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fc8ea5c0c958ffca835561b80c267728fe56aa5ba8b37b2fc2df4b23c79228. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TLREW2221509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421756d6c35fd74d60ca38d8e6e9c0dac927efc5bae73309dfce5ed275ae5bf3. 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/TLREW2221511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6119fa917cd5f0083aa2beb95b7cfc16791cdcb08889487325f8fc5911bc842c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TLREW2221512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb909282ea33dca16d64a060a161639ea5881fca0bae48a149624a20b42d68e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TLREW2229440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ca30829a1c9f471a0c902b68d56f946c53d89a8a19c587ecf6ac4ca1f68d91. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TLREW2229441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b48357dc191e41b128a3e2a414020988821e13cb5a8ca661f7cdb8ac9180fa2. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZVEM2391111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81f194830cdb6676bdb470673289fd60ff0119d16872ee3fa1ab69715417c5a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZVEM2391112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0172595ef1b5bbc614b200e0ffb9560785d16c695c090b8a1b271da0ca0e21. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZVEM2391114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd706282d849886b90dddc14edd6cef4bffd0f5fa44c4582380eac38354608d. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZVEM2387514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5679773304deb1e18543afcae5cd38c42cfba32d845f1b2e48aaf34fdbbf40d. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/TLVEM2474320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cdbb3868df7f05135d251254cf34122bd92a813b1f8df30996c8d6b6b27ae7. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/TLVEM2474319.