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 0x72efa2b9c4c75991723b12d061199863ea4f010dfe2cb168c098fd92365e9e97. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d34e4dbc-c97d-4c20-af06-57400e8900ab.json and https://artists.proofprofile.net/proofs/artist/d34e4dbc-c97d-4c20-af06-57400e8900ab.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 0x49d5bb72ddfb56b6cc3abfc9bfb30c597b361904f46e8e253dc5d720b0e2fc20. 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/QZFZ62187557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0704b62e0f187fab2dbc2b16f7335bdb6077d724906590b98f19c9879a1931a1. 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/NZPB12403582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5ec1bd99a607aa63f42f46c517332016faca836c5d33e7ad84223e590c992d. 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/QZNWX2065069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d91e1d2a5e11e923922557db37364dd5211324a78cced5e6888a9c6907b9a9e. 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/QZDA52227334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c4d42d4a3f72cc7ebd448812b99bd7ba95a8c9e7cf85792f64300d86c356cb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6N2169410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015b47896454a3f6edb6ae8fc57482f473630be4314e5b06805ed3c7cd589852. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6N2169411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09608fee5507c348b223c40aee7443bc59dcbf6987669874ed193d54b4e000b7. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZK6N2169412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2307e40033d07acbe1b2fafdd6a8faaf84526cdc62bf5f582ccdc23c094597. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6N2169414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ebee7ae6d7072beae0ecbc1560052cc0dd1a9aae464d6ed6c1244498e45f99. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHNC2174946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f9aa022da33c7482c377ed12ce7b11bcd90d970945145d0902ebd87a772687. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZHNC2174948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cfc6baef0f749e01e034522e9cbbcb03f7ab5f7884f9e241842a785c9887a3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN62236899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a505e85711a97a12152c7a6182a28e14c398b809a3a5d8b1dee510f5bb06473. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAU2191167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c1929a7601d5bd1be5fb49cf6ce5075fd0887d5920dc4bb20cb8b25f40728a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZK6P2086127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4dd97f1493fa6620065c5ca86d8f7de8248361910ffa52233b3f98a71bb223. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/QZNWY2148783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a5a0c347ded1e1468730dd091d0b6f7f56e9f0b8d9c84e208b1271ead8c013. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ62224621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33e2441f54d8cd6ff6829037ea3beb1336c90d1da8c6e85ed18f0e2549ef95a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWV2087397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a82d15b7913f8986607388b9475f74d9d8f778bc37dc0c185d0b283d814ec2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZPLR2142970.