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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55743830fc8a0c210d7768c260e569b6276fd391a195b8061bbc58e1cff7547c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4efe2a8f-ade4-422b-804c-6fb61ff287b0.json and https://artists.proofprofile.net/proofs/artist/4efe2a8f-ade4-422b-804c-6fb61ff287b0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c87fb827c7adc8f69cdaad2c221b2689024d3ea4f3ba40fa8759153a55482c5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZRP52599376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7043b507382f8fff5a45fc634b354e9754852b047b304851712a1fb00d8276cb. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZRP52599377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d7061eaa7dba6fd9f02c45a03b2e6af86caa11bfd2f1279606d650eb29e83b. 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/QZRP52599378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f889d950ec5bb8a2a01a221b691d774c08afe22f40c9e877fb065c6273d166. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZRP52599379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c632f10cd72b68d1653c0b4401bf98daa4e6bd439f6b229af4227c5776ac896. 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/QZRP52599380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6a7299a9e68fa9bdc31196f837ba1dcb200d991f865be8770367e3625e1727. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:47:13Z), 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/QZZ7K2483463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a61294fe6fbcc736e979fd0167f870339bc5d60ffe07f1e48f9a42e42c64e1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZWFH2361461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca6a7e9a665acf7d6e50b4bf4fc5ad9073987369508ccdb7ef528501b582078. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZMEM2427364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1433be373eed20a87a47efdd37e8017c3c54fca790e4c6844576eedf30c3e142. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZHNC2421361.