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 0x2d0d3c8974acd1db517e73cd44b9ebc07c14c31ef1b734b3eeea7b81fd17fdeb. 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/f4bdc6f1-752f-4e29-bf73-e18fe4963781.json and https://artists.proofprofile.net/proofs/artist/f4bdc6f1-752f-4e29-bf73-e18fe4963781.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 0xee09c67f6b8976697ceef3a5879eeac03cd837e6f7d199f5b31287b06448e2ce. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZTAX2457861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd7ec8461d39b3fbd4f70e4bd550bcd93346b8c100eef9cb492a9140ce7783a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6G2472500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf874fc45b9ecafaa5a748c14d430e96508b28f5880ece1114301e872651a6d64. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZDA82476126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea7645c39d522d407768e364ab9812c15f9f5a97768d5f9180d9bb2ce9ff01b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA62483679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7f659f8bf5400fdefd857d923e09069b04895b2ddb85f223f26f61315ab547. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZFZ62439147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4fb5bc9cd9b93c5e6dc23576d7964443cb0aafc5f527c531e13bdb145dcd29. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFJ2312336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f8d8ae9d082a98218b2c3a76b5d82224d5547edf7bbd38813bd1c80b5d5118. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAGI2287908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b29122182245daa1976f4d36e011ea68403a329c88a8533e3cf302a7d63c9a. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCAGH2205558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029cd3ab4618b78cbb45c666091e48eb8b47a206cd0fc2e9251f057377b039f1. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/TCAGG2247744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a9bac3d51620abc7ef791f73aaa91ffabd29eed53ed0f977b5bb217a8425d2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAGB2240342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d698d00d44945e3180836af995899a18f8ccc6c443a0a0816d878412ddb94c5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2150028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0485749e4c6fb95fc93ffda1fa23b5be18026af5893b83cd3dc47245ad3c87d1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAFQ2186376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e71fe10f39e3dbdbba6cb05727bb00bd2895acf9022a028f51b75f31878cfd8. 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/QZHNA2107026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e4f5d8ea2b4eb858243fb9e222b2785879a2066b3c85190dddabb8275dac2f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAFJ2194618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ddd8121f213e6b5c3770a7426d25d1a9e568cf23f9dac71c6b0046e6c1986a. 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/TCAFD2042834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e75984a4f6d9ca9b5ff8fd93d5e4a14e34ed4b8948021cc5a21f46d4ef4bd08. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAFD2075639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b35ed472ccdb354aa9b74254d66811ada99208e20755bdd550e2a4bbbd738a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMEQ2025937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fac3f8cd4d38292960cdb31149cfcf8250275c18f4af50c8491acf8f735d282. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFZ61919637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3aa17c573d3a139904f07685cfa54bce224d9b77e07e00c6bb92d1fd882064. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZHN51926560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1114a6372c11dac3b1d8f00c92df1385b0bf32bf6773e67c1f74a25b3ed2bd1a. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZDA82186450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a85a0d8c10ad7cf7f50c3dc504516e0f7d33de416a5fcd9bc323088df244fb4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFZ61993778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf8534f0d2ad071c8c23176b72994a4659604980541cd26a3b92b917ac1592d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHNA1981575.