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 0x3f17d982e2463308f7b51ad8a58edb9deb1f431fa9d49c1593e2e69c67122d9f. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a09d363-b158-41a9-8e4b-f61ae89157c3.json and https://artists.proofprofile.net/proofs/artist/5a09d363-b158-41a9-8e4b-f61ae89157c3.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 0xde68b9914e44bbf0809b9b87154df0e7b6c647408b09e317aa2e1ead839c40e9. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QMWCL1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2e8aef247051d5c0b18a1288c5f5d8328e099cc95eb1d47418055050d631c5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMWCL1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f3234916c603a4da6015db9e03ff646ebbc0f84bcb405c28a8b19635b0a306. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMWCL1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed3c009bfe1c59235ce5d4abb258b915007bff4b02c15a0bdf904ef1830f4bb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QMWCL1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96c24c98011711a7a36bf4fa649ff2d9fe52daa8390d229dff026f0b7669bfe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMWCL1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7e3ce7d2797688fb45fad10a68a0905bc4e18d4c38e30746e7a4015d23fe2d. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QMWCL1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9aed127004a9e4472917b0fceb92a0ab9bc1abab66c4d762d8c096860eaf7b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMWCL1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa721b88d903e483e1fd96ae3d70a5df88aff326a05fdb160d32ecbde2b33c118. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMWCL1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd554a66f8d3192e0355389fffa380fe12311a7ee8b88812a6ecc5715bb4a1451. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QMWCL1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe464283cdd155c62e83dd96de2c51984c4213c6a040e02d4f3b1bdcf493a3dca. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMWCL1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4779733f7722b5c8eba589b992256487e038c8d04419123a7ab49c6aa0c5bc9e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMWCL1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8108c3353eb7ca33cc9503bf99f5c1ef11679b2ba10abc7db85f96f5cd92297b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QMWCL1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91cea25ad7198edcd9595916a08ff0139f086f0e411456092a786157125ca10. 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/QMWCL2300003.