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 0x2d5c9b73d57a8eb200ccab7aa47024eee26a994648c864257b02f04233252c1f. 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/677e2b2a-28bb-4ea9-9be4-c149c0e4c141.json and https://artists.proofprofile.net/proofs/artist/677e2b2a-28bb-4ea9-9be4-c149c0e4c141.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 0xc02e161a34d7496f4cb43fc93a79ee5e948819c2a282ab3c31101d18a472c219. 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/QZFZ32086559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3392ae64079b0922e6806cb41c5b268cd99066035e3ff6438a92193d0eebaf. 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/FR9W11831770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643d49b0385ebf371d27a449ecca3c2d8b23cf91c76e6632f62d1996ae74c6ac. 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/QZFZ32087160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8070c62e1db2c9fcd20186195b64bc5feaafb990f6c41d690f08e5213f5aabd3. 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/QZFZ32087162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45dca483ac48b8b59e2543de40082c37d48ec934097479e963f8dd66f501d3b5. 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/QZFZ42059075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ff08aecbbd2fbd1b0f892a5b1e86eb50b106382624404acbfab1a8e5460e1b. 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/QZFZ42060300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5be6c04ede8c67b4bbfc94994eb64b753ba17bae9cba68b01756d00bab08813. 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/QZDA82183376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a0322ca9f1d2404b2b326ca88c167a3f3d789b90444a1d176d61e8f5c94c5f. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/QZDA82183377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3102a47255bbec2d82a44cd9b5a031bb139c9999c3bd31a3edb0ff56ced432. 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/QZTAW2366201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76be262c2ba56c3e6b3f1a4845a0a7e3b4bb59c67a3fb9489a9c6b255514de50. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:57:07Z), 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/QZTAW2366204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed713c07473b4bdb3d823b49816e7c5c1372ca0f4e5a9d53065b57e6ea8f51c6. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTAW2366205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd878e6ef99e5e721c0083b3c4f4da14bc4b758eb75ef6688a67bf58360d68675. 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/QZTAW2366206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba35aa7076efe2715417ac27589a581866f7803223a111d9c4aadc7cc20e8fa8. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZTAW2366207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d581d29ae14388674ac830544d253829ccebdb05ea1d22d27379a9e6fb211d. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZTAW2366208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382e931d7cf8f572fb0899de0ed92980b368d446d538e603bae504847fe2e77c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZTBD2321160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd352426f6619341f5a4b3cf4bd8088deeff730ebdfe2f9c476f0dc93e8b485d6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/FR9W12402558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9749bf88d1210807b8d31589ffbc63303b36029c36a8a18828788855f128c85. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:36:32Z), 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/FR9W12426334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f76636774d493c8ab67877e92282f5155eb9920f7997c9c661e3e5825a93c1e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/FR9W12426335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941fc68263f8df669a2dad87dfc709badd9f7ec2863fabe7a35034e1ed0ecc03. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFH2486609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d843d3e11bac70b108ced2b6293fff7155987962dea3c5c85753516492a7e1d. 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/FR9W12462158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803cc72e999cd6200da8251043d5544e167de54635d0d212a25aa2eedf7f92bd. 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/FR9W12462159.