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 0x442321dcf171e0d491f540379ad93115b9b3e6ac0a67820d7e141d8454d5d75f. 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/08cdf582-8b33-40d9-ab0c-9e6715087db6.json and https://artists.proofprofile.net/proofs/artist/08cdf582-8b33-40d9-ab0c-9e6715087db6.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 0xb65d37c9695b0bc783927f99ba000c094509a4729a1b16b406785356480bce31. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/CACWV2102029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe164634d104bec3696f178394b1d76f7a65084fa1df605a35296dfa90b17d790. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CACWV2105601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ceb3ec0c40339f0505807933c4038022579ad749303c1cb81b108b88e087cea. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/UKR6V2213500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5b59dc21a1030daffe681e8330b772ef2505db3d91292b017de94445108e61. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CACWV2301943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5b59dc21a1030daffe681e8330b772ef2505db3d91292b017de94445108e61. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/CACWV2301943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5b59dc21a1030daffe681e8330b772ef2505db3d91292b017de94445108e61. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CACWV2301943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e0780f4b65902e79db8757d3d307e31749e26992fcaa9202d79c37829b7c8c. 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/CAENV2328890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3733bf2a77d9c91770de372d5ef1791c5dc5c9edac4c4020336da7aaa4c3a66f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/CAENV2327332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e795e4d426875dbd3fb4169d09118ec6df8a730f8822ab2f8f79a9794fad18c. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/AUKDT2300713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8dd4a2629cbb62b552468a0fd08619762b7d0884e4deb92cad6bf17fa27d5c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/AUKDT2300714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72bdee5304a76fa38c72cc2b32527f4eac547bb9ba0be086a84aab8d49f5886. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZWFF2422535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3950d8bac806581915a29ae036736936e1ae6983a4d2db7c268fe55f1fdea59c. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZWFF2422538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09d5ab3c8a028ef6449f6073083fc347a98810a17073e4c3cdf2119c8a49576. 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/QZWFF2422540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e4c0dbf8247cfd71227fdcbcee345b20d3ecdc7f3ac004533a74b64222e970. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZWFF2422541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3603e49f50e6346502cb68d5b963650dba30b0dfdfb773ca8588099806f769. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZWFF2422542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392aab1c53a81c576602c754f9de4b99f187151f34703a3d52919c107f70442d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7S2447283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b56e9423b340d14f12a271b50056d0532cb474af70cb5d1b648523b3b585230. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZZ7S2447285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c2a2ded3acc693b541cd8c7b891e3ad01340e68cdda1cdb042b524ddd5644d. 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/QZZ7S2447286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e59fb96cff063d117666c55ca81d025bf8c3a190cef88b73c78a3dad9e0db7. 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/QZZ7S2447287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca67abfae356944cf9f403dd64bd68ecee6d346753011ea14039b45bc3dc5fa. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ7S2447288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1d15be1e87ee57328153c98824fcd28cce0881bd73bfa707845f62ab501655. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZZ7S2447289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8a754ab5de85052e7b1c5377f1465c713779a5898eef740cc0228e8daa4c2b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZZ7S2447291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f708549aa8c8df24feef18689e139d211a08b854cfbb644bcf6d8790ab4091. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7S2447292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81737ec5714033433f9b244db0e4e143d9a48fa2312d6a34bf08f9bbc6d64dd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CAN112500959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512b19815e983a3a75250d9051a0596ff1ad6bbcc6fd46842022861b1cc4896f. 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/CAN112500961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a3593a4902bf6c0e7c8d202117af998a29478f2d8020cf4c4c69f0887d8a8b. 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/CAN112500954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce601ff4d5e3e039e0cf30ff39b9d19cf92444092b558439e7a8c73470989d0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CAN112500960.