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 0xf360c307a6907d1aae6c160b03f40bfb25aa81e2c138cafec7b60afb22ebb786. 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/c374a78c-7d6f-4cfa-8558-8c77d542d72b.json and https://artists.proofprofile.net/proofs/artist/c374a78c-7d6f-4cfa-8558-8c77d542d72b.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 0x2a27c96dfb50aa0c1fac34253baca1f23c5574087ab0f01552b35d9fe24b1f86. 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/QZK6L2037555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526034ad500791b4afb6fb5f07436dd92e1daf4c024874799203a50b03d91f4f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6L2037557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81771602467556e6343a9a8c264073e5231224a14af0019aa074f7511673366c. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZMEP2035033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c945aa743ceafa8a6efb02aa3b4759e2ee26dcfdc7da0abbd47e3244b86299a. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/QZMEP2036132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e3ad702543d88010ee11f1e187911ed577ce85e036b736b1d4a34bcf039c76. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZMEP2036133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f4f077afb44b2099b157722a6a19218e1bd3eb15137827f6510a2672caaf99. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZMEP2036134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bce7cc667bd0744e424875f7a3e6060f18afe33c6ed3cd4fd9bd9e9b629910. 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/QZMEP2036135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918f2ede38072fa3c3791c20d2700f604de3bd419618968c11aab082c59baef1. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZFYZ2198737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf779d6fe3b627d5ec0e62e5fd93bc3c741d25748dfa4531e88aa9bad2eb8d425. 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/QZFYZ2198741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc083b7afcf807ec9cc61062534995a9abfefb03c7e3153298321eb21554a422. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6H2169190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f816b4ea93eb74567e231a7442bc13a99fd35b84dc166b15bf8d0c57535601. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAU2103395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3884488277824598f34616a40c0b79d0cba169b2f4d50baeff7b03f37debdbae. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ42235036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c6053b0bead90496ad4277ca8bbffef2e74fb569c58bb5e5dd1a3f06938e6f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZFZ72292004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14285b15a6b2232f5f6c80955fa61ac9558c21d00109712f553f13ec7f21b3f. 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/QZES72231477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9840bde6234e6e83cc0f7e8d836bc3f2184aa3fb7656283f30de5443dcf385. 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/QZNWV2313311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d37547e5c2260413a1947f845aed11724e61fc7eb542cdf9ee368d87331a3a. 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/QZTB42365355.