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 0x0a2aff0f60eb40cdc5ea2d9a94c6ba1d768c4de573bac234753d0bcde7646230. 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/42e0382b-a1bb-4f8e-ba1a-dcd6802cfae5.json and https://artists.proofprofile.net/proofs/artist/42e0382b-a1bb-4f8e-ba1a-dcd6802cfae5.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 0x80041ed3537c7eca0c5b2bcc4cc70507f690cb59b4ede5f61fab0d26884c5b8e. 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/GXBNP2479164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbeff0ad979f2643ec32b82e11f7016fea258ce970f89eb21e0d27172edd4b19. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QM3DF2408515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac3b674a7162b551c368a876aef8dac466edc23be732e8dbcc00a5439d221b6. 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/GBLV62420523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c8fe379a38f81c5772c03211910b389ce8db21adffbdea4c7850f90be05633. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/CA5KR2513115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bd5b9e43a0d3a80507db9556e13209b75e70d6efcbab99f6ec7a7e7b290d81. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/US3DF2531901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde65f9edd9ead2eb2e7950100a647e2eb0990503399f832f24f9472d625b79f. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/RUA1D2580223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a46cb4e216273241a675f79328386ac35a69a75c09ad3e6459b0fe155dd2043. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/RUA1D2580224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba01206b927fe805cf95e06aec0f9918472ceadaf43664f2ee925509be2e961. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/RUA1D2584249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b0e6cf5fefc6c891d02a46f50e521f33274caf5e2f9e92a46e8c41db05a0ca. 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/US3DF2568768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2901dd672ea5eb7ad7cc19ab7efc6beda765149c8a4e142eaabdb1cb98305451. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US3DF2568769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d55414bc9fa9acdb37cf9189ca1b2766b17281b2cdef59dd4f0b6b9dc5a92c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US3DF2580385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36aeb78973eb32818b311779e2009d10bf23759701ee6c86b2d9f33cf6b2f121. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/US3DF2580383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e5eb3f368d1e289a1012c33f25ac0774c115fddf18c726141d6afefc767b4d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CA5KR2541142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81f4cf9e73ff6b2c5a4fcc506b1f82c32dea7fe70fd9cfbb5090449fc2dfb5a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USANG2516944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2b68bce04a7e3b8d556d424d7f54db94ead4adc28a6c140a4bcbd7b176af12. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT5M32531827.