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 0x865d263cdfebfb7c94cf3cfb182a729fdd52f2e5d7576a2f322e059bd0c132dd. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf3ab8a6-7a31-465d-94dd-683d7337f3b3.json and https://artists.proofprofile.net/proofs/artist/cf3ab8a6-7a31-465d-94dd-683d7337f3b3.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 0x4cb0cdb141609755032a9a31ba8c20c0c1d043718364467009c0c0bcc5ed7bff. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZSQG2421102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce2ca21416f56bcfdb080c823f7fe63fde01d87ea6ee34e7b6991c3158712b1. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZSQG2421103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd1ab08a144fbd1d6d674029d8c1acdc23b2e0d936b275c77cab973b1215d7a. 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/QZSQG2421104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa23a3e470c3ae7bd9676c2989b81a284ca78afd9029b2424ed853205917d039. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZSQG2421105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb32af40aa138875092a16da11f56db9f8a9f536806873845ec9cd582b8ff7e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZSQG2421106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12bc2f630c87924af5d0d0b0b93526463f9c1b33f2a46bf457a744803ca0a11. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZSQG2421107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea9df922cbcadc30679b94d414b4b2b8ab068041f1580e7e93e4d2f00ad19b5. 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/QZSQG2421108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301015d90aba85a68019e5d820b2fd9d8b25ffff7e98be3c08ee9735a62dea08. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZSQG2421110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e745151b4541fc5cf423ae06e2c597c20c1892bfac5f7fbcb32e53d08cc79b7. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTBA2394483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7668dbbf9598127df88a9e01ede42e4bd0116a4699a31dc1648e433ba3b6bd63. 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/QZTBA2394487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7048212204397dbfcb3b4f79bde6753afd6998aaa863f5b9b4c8b8070f5a5dd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM6MZ2512829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49225561ef162b3dbdf704a39e2a049b41a1e4da35cb5b9d50cf70e4af6134b7. 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/QM6MZ2512833.