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 0x6fcc46622d12a85d272aa3bb93237576a62697bb2f0c5e240531ff05e94e0def. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca941b1b-6ff9-43a7-b3ad-a9dea9ee8c67.json and https://artists.proofprofile.net/proofs/artist/ca941b1b-6ff9-43a7-b3ad-a9dea9ee8c67.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 0x24b225b0bb4c833ecdd9aa2f60a11268360b124ef3abfc069d3521e77fc244e7. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FRX282236817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2389835774955be787ecd8c510dd10d521ac79d94835daf6aabe2ac11e445327. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR59R2385834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358dd96da9dc3da2b31311a8c8270895326bb80d2c81ca5a8926dea640b6ec4a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR59R2385835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd321f76f72714d5e6e0a2a9f5181c2190c995fa74fc175c805ae89eaec65a9. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/FRX452214562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2acf343f76d1d90bed51e5f0dd9c8583d458ed1999098d9cbd8c2cbdabb2a18a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR59R2385836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542811add1d8757fbdc0f6de91353cf74de44cd61a917d30a19a42d103666555. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FR59R2385837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2ee9b50ee389e606519d482fca442e0e160e9b3bc26d532b9a9342c67a3683. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FR59R2385838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6991018b3d229f5ddf73078ad7d1b47436384db39fd6663493867fd05d1087a4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR59R2385839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e6964ce4f37ba5a1a2eb79cbe7e76309ba8b7d2d7531bbd54e6de9b75ef595. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FR59R2385840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc43f3ecba75780a834cc8443937ed783c185a79bf37e86fa80622d0e985045. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKG732410247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad83c4e0041723c772b8e908c00fc58b2d85b6216aebc29d52d56b9a5da4f4e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FR59R2243733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2385e5e0a2646bc8089d719c2d590842a7a617a6c846f22d9bd3b7634f5a0e86. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRX452119641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b82f5c76bb47953dfbf7290c7a1bb7eb85cea667848e131d093efe175ec401d. 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/DGA072100403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ca9cf61b977873bc196b9a598fe76b34ce93f20684abda43614ad2eab33d7f. 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/FR10S2184029.