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 0xbeead03e1cf7239f460aee76d91f85220aff928767c0eaf072ee8172f5f1e8da. 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/10a05251-15ea-49fa-be76-d2935289a190.json and https://artists.proofprofile.net/proofs/artist/10a05251-15ea-49fa-be76-d2935289a190.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 0x09618a12d28647e709fddc141764bf8eef9ab4cd710241c10539bf92e7b240ab. 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/QZNWW2232983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa41b48e9f5dc68f3bd607ee378b454a2a8476cd8e53aa0d35b49070effa6adb. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZRP52259644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac83ebe7112f2ed763b7b976c46731b662aa2131eb7bb92da46e35e3917b587. 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/QZTB52276881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd15c88c9fbf0311ddfafc567c6dc86376a33ba4fd2c1a0950422e01e4b2c05. 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/QZTB92213547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992f9ec7f1f4247862e9e2bf246e159c60064515add63cf96055fed4fee1d8e7. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZFYZ2394857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa740e3a7ebe04a396ef050aea28fcf73f62833d0ab7a7f5ce663783b4b401736. 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/QZDA72390375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f2ffc0695b521cea3e1ad27031b91261f3b80f225029b7b50bf1b5fe1a800e. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZHN42330870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65a537c2bca9895db7c0578114baab2fe806285ed91e21395e87dd4c3b07479. 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/QZHNB2317834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5663edec4b6eb46a3eacef0182fc849539db06b80f5c4f0fad403fccad1a2bbb. 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/QZK6K2313768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d3b82eb05a6d97526fad43d644054579ca8eb11e0a652553953cb6353411c2. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWY2336365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9018c3693e718c16e3a8a743309f9197af97d4f117fb58b8cb86fcea91d3cbce. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTB72344485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2b6563140c24703ba573bceee68dd6024a35cfad24571df9b4c24128da7179. 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/QZES92455358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5104da2c497d89859cec26fcc3a6ab67ca61c55837b464a54a7b177c0d5a977d. 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/QZK6F2434216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc740833f41749a6dac2787c3161ce32aae07d86b48d6cbbbc157387f0a5b770e. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/CAQOI2416359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb581f300ba60c787899c163f904f68192cd2f835f68b566c5a40bbbdc350d5c. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZHNB2557924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc989fc24b3dc910819294303835a89860319ee07c750077bd1e91c0582d379f. 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/QZTAZ2547836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50332be40a7d38c777f670e10350b6fca063febe6f7a93e0b38b77a369176b12. 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/QZZ772588209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c905b4b56e32628a92ae325822a19a5aa5f99726d20c15d64ba251c8227254. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEAR42440837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee55474bcf486bcfb08df0ed7ed01b533e69e39d0a404aefb26ba465cf17125d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEAR42455420.