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 0x576bc7a293bff6358bb37c81503f02a1be5932020ffcb33a187aad8ab267cb81. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4187c705-3498-41de-8397-82abddc51fcb.json and https://artists.proofprofile.net/proofs/artist/4187c705-3498-41de-8397-82abddc51fcb.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 0x3cb827998db3438924d56305e9294debd026176033dc470e64acc721d92ac25a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTAZ2501227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca55a14ffaaa1fd609ed1b2644d43221584a8502b370eae93bd01875e7ec926d. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZTAZ2501305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf11e832ff57fb0ca979fa91ffa3f9c1281fd786de2cb135e1480f28cf43ac9. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZTAZ2543349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc00c7fc8b822bad0ad8add9f3d555e3eade7a5a8a1f393707273a73a61a462e. 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/QZTAZ2570640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d01a61eaa6729f1557260e00233bd2cc7a39568dc46a461e26e886b033a12c. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZTB22512832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4587f4af8917b2249d14590231338ba9a618d5c170a963b6028e6dc47e508e31. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZTB62565870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80dd81ec74050bdc0546bdefe1cc6e56b921ff34ff1d1c1d5bad3e1097556de5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZZ7T2503445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d14a0c71b77a41053f0874b67c3b9280baf818b3cf797855c94ecc2beea38bc. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ7T2558449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019afa8aa663a1e46358d2becb03069b88565a000bf3b46cb43f672c882e1a7c. 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/QZZ7U2549633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472251456ff901a5c0b461bc974f937a389a909260c4caebb18b4e7a7ad068fc. 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/QT3F72511251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bf3a41d9f36f76802b8a114c932002fa596ddf9a2039b8ebe2dacf3ed22609. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3F72590373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8f6821594cd66702ff32ebb4ffcd14af1e2cd7a002c0c355b1e16bc0469f92. 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/QT3FB2503160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e3a90032a1d58ee845994ecad0aab43179faad5f2ce02d09ef3dcedb5550a5. 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/QT3FE2526518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261da2604a686fd0b4afaaecd9631400af947f889141b959ad7f528bc6e6cf2e. 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/QT3FH2525033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7dae6c4ebda61bff2a6b0c278e4463d84063faf7b2afd865aa5da56b077449. 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/QT6E62517228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575558d19bb46855abe75affdc1e3dfebef52140464d1b031a00aa5586f29caf. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QT6E82591429.