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 0x31d59cb464dac647423af11647d120f186f1f2965eadb5f9362c597f50d2beea. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56dbd033-9844-4305-87b9-503a84aa0171.json and https://artists.proofprofile.net/proofs/artist/56dbd033-9844-4305-87b9-503a84aa0171.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 0xd1d8675dbefea21791144419b8e72c2a4627277300e792158a394dceb7e23511. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZ2E82111258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839f2da7cea24134a46e585d3559beb2a20da5c86604134f4dab0d09f51ea841. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZ2E82111259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc034a6818bae159a554394d390ce38e1ad0a2b176e288f60c6bffad10414f20e. 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/QZ2E82111261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732943f18eeec5eaf8f6341f195737c669198bb36b326ac60be00731dc13985d. 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/QZ2E82111263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec10fbfc7e42ba112df9f7b0aa5119e66f082e1664cb3e58d48a0808cbffdcd1. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZ2E82111266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe236bfcd5f9295292d1e90b8b10cc2f7f783ffd4b75f2bd31ec38228e9d0dd44. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZ2E82111267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f34c4082e37dfbc4872b2bd6ab90e4312235ec32312f01a727255768986d06. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZ2E82011576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525e0c1db58cc470b40ea69f8d9e2b485588c7da9894699f7272efbc69060884. 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/QZ2E82011577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577dadc9f5bad22989a34ecb22b92f2663116516173830aaa4d8e3c1d7be2625. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZ2E82011578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4df8d5276ce2d92560b80cdd5f49a07fe61214dd37cc36d4cd1448329eda2e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZ2E82011579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9390a4add15464de21c4da835be8a6ec9863a554a8e552bda16e2314a516c0. 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/QZ2E82011580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4895fe985412269d213a800af1e2014d180b1821e2534b62a3705b8778ff0b1. 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/QZ2E82011583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04e859f471f9acb87b84341060150c88e00072d182e87d7bfd8b0799c759139. 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/QZ2E82011586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba6ccd36b0a19a8f9a6cecd4ae3b40324319c1a3dc3fb62c30491d121597ee4. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZ2E82011587.