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 0xc5b104b37c6c534128f277930c9a9e92ec790a75710c7db4a5556692cb7c534b. 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/7e4d4ce5-7e05-4e2c-9615-4a51be0598b8.json and https://artists.proofprofile.net/proofs/artist/7e4d4ce5-7e05-4e2c-9615-4a51be0598b8.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 0x5820fc35b5c2694c55c0b5440115a006c98d57165b1f83950ab572a824620527. 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/US4R30602336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f90672a466117467403ddd4ad935c8fe75e57490ad56edfce21f716abd874e. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/US4R30602346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca7f8cc9a9e530d2e548d0c7c6088649b447ed9c1591085355fa37fe6d1ed7d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US4R30602408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36438504659241560febabeacf1fec20c47c9444bc29465cf2ad0c137df9d877. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/US4R30602409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba88b8fd7c3e9d4601ed6835ab4ce3f67d50783cac3fcbb11686ada789e335b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US4R30602412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7882e4d131d4a2aa3f180db1037a830654e2e35f3651cfd9ebdf9da5a19e83. 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/US4R30602413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc645796660690b9987534f6f086b89d9f20202c8b1090431711bc9f947b29d7. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/US4R30602414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ae948b7bc18ecdd35b90adc38e5254d3d9869f7d769616961afa82e85850da. 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/US4R30602353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575178d9cbcc78a5ed3ea43975551c763b918e86c2726abee843d859c20a40b9. 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/US4R30602355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84ac767d0509058af33926871fea1796896f6af0fb237a0ce0dfe3415524b3e. 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/US4R30602356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1d284c4249d7f2b23a5c4e79ad758c40e9edad6285fa2aadd6cbdf162a94dc. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/US4R30602357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520aa27c4a30e69aa2196b30d2010e4d68362ded8693e02cdd4abca614cf2aff. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/US4R30602282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6023e7066d88d07eaa8d2b99f47f2be188c7020b74a5bf5156edfddf5054294. 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/US4R30602283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ebaac13c279c8bc545885121c0b0a781a054ec6ca33ef6135387b541a876ff. 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/US4R30602284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9806089784313c5bd471b843eabb34be62a6dee4062a236e79214add680b51. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/US4R30602285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24fb7fe3c2929f074d081b7319accfef5d5df9bcde1b04ca56e47c5a982ac94. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/US4R30602286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b8eef774aac11459767c448f598ade4bc84b62f181ca9b181c2c184a732e00. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/US4R30602287.