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 0x89bded10321c5eca014ab7fe47ac28e54894dfbb200fd9161f8c34613ec3a774. 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/7502f4a6-33d0-40ff-b793-fb528bec9543.json and https://artists.proofprofile.net/proofs/artist/7502f4a6-33d0-40ff-b793-fb528bec9543.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 0x9f59b76f2ebfa9a91fbcfc1b8f7d85da3bdb3849815b0234ae6f44e7b85f2170. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAES2063800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeba83f79412c54cec960e087e64a0b886abac999d5bf6bbf9fc922f0e18e1ca. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:23:35Z), 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/TCAFA2023328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f5deca40d454760a561951e197125ee40be674b2bb42f0f25a677b46098188. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NL4NL2155606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd591e6e6a95c08b14d6b0c4e9507f3ae372e25c5a99e72403506e105137a11. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FRUM72201743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc78f1bba5448ce2fa48520ca661c9e04cd46a644168c98ffc44eb09cd364409. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRUM72202806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd2847a7ce6fbce82ea5659e0289ade0c918b3313bf3806aef98654e36d2d9b. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/NL1AP2099308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9884a08da428d929bff56ea16319b75e9314197f625012a091ce49425e93af1d. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/FRUM72300462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af030462860e593cc665d6a06a61c34c4df7f26245ca72a3a01e3456e08e9f1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:06:55Z), 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/FRUM72300460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd008980831a17e7bbd5f4d83c20f3fd4811c8a726331517122952eb93ca56c. 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/FRUM72301459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c36844bed02049ae4cceba2b38af9c21b25d0d6491d3a337ad65734963f4d5. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/FRUM72302223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82db3a03458022b1a475c7a52f42d609d8454eba95c887ca8ae908d9f797a258. 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/FRUM72302320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c36844bed02049ae4cceba2b38af9c21b25d0d6491d3a337ad65734963f4d5. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FRUM72302223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a142c675e0ef8f0e1482a2893ebd5549e9c284caaa34c83722fd587bd325893. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/FRUM72302324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dd47e70004f9ad452eb927967f89c16f31f4a67a040bebfae1b349106e00e6. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/FRZ042400401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d30ebe5227d5bcdc7479938ad8829f47e22e4c51e403a26d16ad5f810f9503. 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/PLUM72200606.