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 0x2629508f41222dc67eb50f8d0d07487ead43b684e98b1601e63a1fbd36d40ba5. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d80d8af-1684-476c-8472-da6f6f7e2216.json and https://artists.proofprofile.net/proofs/artist/7d80d8af-1684-476c-8472-da6f6f7e2216.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 0xe6092f6010633d16ff85c4201522d9881aac218595267adf9d069fce13019203. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAJQ2599262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60387a221791048ef26138498f8b8ef36677959f2d7be685c73f1adb1f20cf3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAJS2596764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa67f603d65888c49b50b71fbcecc76b740dfcfa1c265a709fc5b5751247a9a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TCAJR2596801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0610b7fb75085f61a7c55e51338a1c50c3db109b9dd3b352090465b3c291bd. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/TCAJS2596826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58291ac446f4a5b9e6134838c427ffc98b678f978002ba523d9c72c45081693. 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/TCAJS2596805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8a21654ee1fc539bdb11eb7e45677b92f55715eb157e72f4a8671cf6f8b948. 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/TCAJS2597107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebb7560e16423ea654dcb7ca3626a971fad646a3e364adefbd0cdeedb4a7320. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAJR2596974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d884665a1fece9a99848ff1cfd0c1b7406c4edcf6d933195748566a1dbd183f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAJR2597078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b7cf00ad6f70ce731a4e0cf2c234b16ee0dd3535c9b25f0b891b4e8cbce0bc. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TCAJU2581493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be9ac5df473eae69becdbe21ea51ff9b18c4566e94df012c58a816d2a2ae7cd. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/TCAJS2581308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ce1ba54a7f45a72216c806798da29051c92e1352e99af91844b4bc09ed40c6. 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/TCAJS2581542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3301aa6771bf7244a577ff6b037880475bddf47b9d5a16f8962ccd3c9261a72d. 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/TCAJS2581525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30264754fca6c92575ed172f4810f0ab5d6e3af02c0c543ea7474e1b90e33a78. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAJS2581293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cce740125aa3a5774209b15e4004776283a67f07912daecdc6db4dc1d508bdc. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJT2581275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1622c38c2dac79cc4d18042d91501a0f37d862bd81bc501f4fb44112e715a9d6. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/TCAJS2581587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa661706b70b2dc2299fd49b57f2863b8699e363d63c4376bea950ac5e3479fb3. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QT65Z2521074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcb446d408f9af5bc2d012a23c3c591305dbb59abafc52f143d217c08e3db8f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT65Z2521101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbe05ed7c9f076813e2265045adb272b5d7cc89ff18815e87f8dac82f23c9a9. 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/QT65Z2598364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67da7c07d4259021619ff18705442df6bab339801e222162577a8ecef2ae5c2d. 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/QT65Z2598376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0fcd5cc25e9d45c1246194b435e2f6d2001fd7d571733d05ad11b78ed95ca7. 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/QT65Z2598352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dc39072b991180671bb5c909d22516b907e3b3820dda792129c17005c04382. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QT65Z2598365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3966f1317c6e3f478b2c0f62735048f3297ce3f021c1af5ce9c4d7b8b5f8fd4c. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QT65Z2598322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3379533d8a85e896aa8850b294a0b84ce4c17d638af12ac891c3caece94c86d3. 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/QT6632500753.