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 0x27e8c01e2b8d7ca1f9caa8037d1654c44ca9dc554c7dce46eec8891680a5d116. 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/b1af2269-63ee-4018-bd01-cf4948a33316.json and https://artists.proofprofile.net/proofs/artist/b1af2269-63ee-4018-bd01-cf4948a33316.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 0x259d8cee0d7b1803ff71d19ae8abd3f8a9232aaf48c79b0f6e13d55c38917b93. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA0H2306454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4afc386479cc94e8910064eb27fce587ce165c2ee6c417c9439f435c7ea9ee. 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/DGA0H2306456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10125617c49983d57b80a45eb4993bf3c6f2e85eeb36f0768dc3522b054a202d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DGA0H2315562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54faa720eb9a8f92a94589f89e3630d07342bc9e2f88112d38d456944a45dbdd. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DGA0H2306455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b631a131bdb47b735510d2268834edffb3ff65efd01889a32f5f5f20d6858ba. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DGA0H2306458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef35a756aa634600c1b52afd2295db435b48ae48a182081469ab043b9df7761. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA0H2306457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5546ff5382a4485ee6598ec019b92b47b78ab4d0d920158a4f5d170c185b2b6. 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/FR59R2393374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd573213e1956fb63ce7472d93c43a0f115b73a66b5b3c6ff4f83e33778d738. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR10S2337152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f3da5bd9a60b0819e6291ce1c3f79e6a4830ad45a8c79d14b28e2f7bb52ec6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR10S2337157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2752729076795f2188e0cb8d5ce1348406c31c81890b21720cb15dc14b300110. 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/FR96X2277047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30dc7772f1cc245cdf1e5e5c2e8f57ce731fa17aacd55121373133a5b2819651. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR96X2277048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a6d6911ca63574eb26991f97a0314abd7855139074a44851311a4efa79ecc4. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FR96X2277050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4f83934cb8b1c862a6b3089b7e6925bf89d0f48a0bc85f51a2e199d3ebb9d5. 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/FR96X2277051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb45f395339afc937d2785c7686d1134aa65b9b7f308335151059097e3c2c21d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FR96X2277054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a709dcc04114f52d83a8c6218b6adb05e99b27770a051459a7934d181caaa28. 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/DGA0M2368841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f1ac37420afa6219a652cce73e9cf3b7ea244751e214f71ab58ce2a7b40b9c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DGA0M2368847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7257104fdda6b4fb38744032cf558db3c5225b6fce147b97df5f3e07f6513d9c. 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/DGA0M2343534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377f7d18b8a1d4ee04eba5aa4c917da160354d5ebe8171f31efd26d7508cd3b5. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DGA082368422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e8ec68fa01ecb7fa224f45d6265c5ac3b4a1c4aba625493f4568c98d05c20e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DGA062372220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159abc425dd4b9188ed67860ada10e3e3f2d49c2f14ab5b72ba1838026f75e95. 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/DGA0M2368838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc4aa51663b96e470b0733bba3c1180d5e40af8d915271190335ab7cfe92122. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DGA0M2368840.