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 0x2178e4af3730df1915ad36c01ef726ffec782ee7a000cb8ab12344858bc36375. 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/3a432074-2b47-4397-a011-ef7de9f5b089.json and https://artists.proofprofile.net/proofs/artist/3a432074-2b47-4397-a011-ef7de9f5b089.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 0x6c6fe89462b07fa158cffd610ac647ff727eeea7453e433399a1d42144bb5bba. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZES62174950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3541675720e3cfa0a2506bdd00a8b2e9ebcc5e56461b8d75d6266b13861543f7. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZK6N2128397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ff498788311c059ae6800b4f6d5b979734c5411f92e0ec8cb6fc915c2439a3. 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/QZFYX2217272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e3e040fe0b25299bc09c5c899e75ac558b6fccba153ccfd7eb967399ecfd4e. 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/QZHN72293129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a00cd89b831b30bc93bdf93f6bac3707e914383e209405fc9759ac61968eaf7. 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/QZK6H2238859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0869676da86163c2ca6354c4683605f0c9763e7b06469050e654e5c529dadca. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNWT2205860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4763272f36aa4f4a14f2f4ce2c31e8c0deb5fc1508487948bafedc3c9d82d8e6. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZNWS2260859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e49e601125ca45d6ca0ed0eead4f89545fe0f69f5c89f00a2382a564c47b24. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZTAU2344901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367f79715c56c2a32b93a3d17ad32ccc04f95d5cfa6cc9e9c908d0fae384db1e. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZTBC2387729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92d4701a4bfb9b6429d380f107a5839636f70a732e7e1c0b1872a29b624eb09. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHN72446469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec54c914478665af6203aeef5e963d1b1be7cbad8860388112a9c28325df4ef. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTB52478272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe237ba9bc12726c1e326a881b2cceb5a2ccfb0e0952198f289e087b98b1502c3. 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/QZTB72409353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2816f89d61f3c269ccd4221e0fca1e0f46f04c00c2325ad19ec2a515ae164a58. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZFYX2536754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18e49d4bffdf7ba38cad481fdc4366e114e0aecebe02add5ed0e3bbd0532646. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZES52527040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738c0457576e94f1d5134426182295e1f555825a048d3bb0dd1da5b25a9678ef. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZTBA2516847.