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 0x594d8b2efb671b15a23bf5485f9809f3df2ae955ad0ae48ade4639df661bf5f9. 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/c5163ebe-9c2f-4b9c-8a37-5851d47e5f18.json and https://artists.proofprofile.net/proofs/artist/c5163ebe-9c2f-4b9c-8a37-5851d47e5f18.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 0x1d2d93f770952ceb093f383e6936ab77f8ca366e2f24b5e61f34ac72b51dbcfc. 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/NL5MF2102827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b767c38963036db3950f38c20cba6356908d33c078b45622b0891d296086c54. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHL2368742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc459d789ad22309aec779d65fe9843d4e04a44b11413e7e7e59c05f190303f69. 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/TCAGR2277183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe252d15dd2257af5c163bee3c5b2ca6e0613c7702c23029a87e232804a183d83. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAGP2273589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673913b0ba7fd8177e51715948a898ad8916242669d7d389264d33f00be6f9a9. 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/QZTAT2187571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0eec9034f6580696e4a96bbedca8fb4ccc312669132426d8ed290ab1e4fdd55. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:03:22Z), 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/NL5MF2100260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e93385bcec82d7cc9151489264d2174df08e8e7087be329e6701d192d2a385. 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/TCAFS2171345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1752cff6a43c7ca13f962d5e5a4095fffb004fbf152b3fe5d4a9ce14de4bf549. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFN2131609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b2d586917a4fc499ecd6e607d0f4d69e5ce291f8fc478b3dba0ae08e20b8c8. 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/TCAFM2134093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4802cefe4b6b154dfebe25a9199375d2ed4e2146b317468e82b3bff0298fbea4. 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/TCAFI2188480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73eb958688a25c424bb7aead84f59a3d91396c14b4b8efda319fd34f9b537b0. 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/QZK6G2215199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a973ae7adc0aa0ac2fc707210767c924c45a27a61597ea63a76730d4a10c62. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZK6G2215201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf945d833e1b28b45e0081c4ecb2aff6d26a9a6f5917734d1bf31bc77f6aaddb9. 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/TCAGG2217618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c588968294b8358a23af93c06dd58c2bebf8356f4e2f795415ff5e3b07a471. 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/TCAFZ2275447.