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 0x8d49014cc51bbcef9f736ed4e474c68da06b00a3810c37393fb08a2ae8a7792c. 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/c021fa7e-d9db-4ed9-a4a2-70d4c4f6ed8c.json and https://artists.proofprofile.net/proofs/artist/c021fa7e-d9db-4ed9-a4a2-70d4c4f6ed8c.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 0x64fb0f89558472f8bb572c4e9277adb26eee56fbcd889b6639895588daf6b89c. 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/QZBRF1890498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb875182ddb796a25a36437345b8dd47fdf06897d12d2efa676659d6f554eb8c9. 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/QZDA41815504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb875182ddb796a25a36437345b8dd47fdf06897d12d2efa676659d6f554eb8c9. 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/QZDA41815504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90878b2f45637982d1735a0a04b72a427325f2af605a57b9c566a7de683909a5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA51849044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97894ea8f0e0abcb7b563556eebf859a91290b67f5ce87509d290027f5fc205b. 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/QZFZ42035209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b58f36011b7b9f29981c7e93cc5af8a7169a508ca71ff5ddd39a944ec29611b. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:16:13Z), 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/QM2PV1868216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ee2bd3735b346d2ef937e543a8e67683a963bd07baac1e531c616b783ab297. 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/QZDA71819618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccf07d13fd9a1900114e9582974cfbc709059cdc00d7437180cf77ca7c0a5da. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZES51882315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84355c74a16c8be191427e52c0f4422b76ff458a826189e815df82895e1b255. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:05:07Z), 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/QZARB1852402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4941764bd464c379ceaeef943fb6086b6bc1f2373adb39b110b1ab5cfecb9883. 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/QZNWS2005882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fbed18a33ac22dca9a2ae294f71126203f7148d76cd0e5a2820361fdea2944. 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/QZFYW2145657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd77d43cc0982520692abc3e0aee0b60eb8951d4e208fba327ecf9bc47bce3cc. 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/QZMER2118042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244c0fef7a7abd4f05734f5120a01776de40807e8921a9ec94f07341770dcaa5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:19:26Z), 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/QZNWR2153324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe3a61b5000384f4bdb2f3b8cf7da416c0c7c35bd926304c9492252486b501c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZMEQ2124178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7068be9a02e47019a32c48699ccfb140436870b5ddd70e3563780440438bd6. 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/QZNWR2153333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5262af40319d90b157525d2c9e11c4ce715c320149db7329d399916b1c160ec. 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/QZN882224620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e48e53551d7f4ed6a2fede7f7acf52e13a8d59cd681213765c98e326fd1d902. 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/UKZGC2203049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bb83891ae42d3b4dda9a2bc6c2cede3a567e92a0ebdbe563223d6d0031badd. 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/UKZGC2301095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b3211dda57ae72e46b4c9b6b958e64140e991949676b909bb4eae50fb226d2. 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/UKZGC2301138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964ed5091965180754bfb4c023817057185289c0699a9b5218adb4202c2ec11d. 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/QZWFJ2336444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6e0fa29eb0f08915daaab492fa907222acacfc41c037ffb67e04b0c79c441b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES82410039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b59f16b4f053abda414eacd26aa492f77779c1b9b465dd9f48a8218724c0140. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/UKZGC2408282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cc262a2d964583456fd6fd10a75072fff7573674ac10f53704266e31fa2388. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/UKZGC2408284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1560c8c04bc9a4c9b6e3a1dfd26dc5071e7cdcb4718dc59bef1ee9a4b98eca66. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKZGC2408285.