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 0xe8fe77608e13cfca5fda027a711eff04e34b6c7aa9dde4e35d1e73f3d16bb65d. Chain 2 (Bitcoin): anchored in block 953896 (2026-06-16T06:05:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f7a07eb-a53d-49b2-b7ab-e0a2e6fd6dee.json and https://artists.proofprofile.net/proofs/artist/0f7a07eb-a53d-49b2-b7ab-e0a2e6fd6dee.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 0xa4b49f85ed97bec1d695584d5b46837546414094c66d4e3d0f7d69edea35972c. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/CA5KR2433072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d291bab78043bce04d25340e36a34d63ac98402c3d1911a7fd6489a7b838a1. 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/US25X1903716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a38d4c1ef0cfe0152e2684b13eaadeea32cefd9925ff1e7a4d2ebb15337031. 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/QZES81882325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0eaa8fc7d9b9420da035a53106bb5676fc945d22bc9156f9ab066095e648ff. 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/QZ8LD1710251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe97e6d462a03fc1689460e97213f9abb7fb0ae484fe03caf898c5b2e88e0ee. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QMPKX1794895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d95e39138a044d616a8f513515f6fb56d9a36fd7ac3bd4687991f6426d12de. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM4DW1792115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef5f5bda0893dbecb6452af8d92e9409b8147b4c36b7f7e1cd7d355a43864e6. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QZ4JJ1793845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636c368b3a42254e9cfc4750b0bd5fd934cefdded13b5bd2063ffa528f6a2f85. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZ4JJ1778668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc440cbe090fa791f948cb667972d3dea69ac9126a298d978b53525d623ec81. 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/CA5KR1906118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c18c2e9347c7ff9ee677b354e7c7dd7c6ea2e837e84fbc68433d1e3f6ce7272. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CA5KR1906126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9265293adcf6e52c84f16d8e38cfd9f4a064730a297071a7b0864c2060b3a8e3. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/CA5KR1906134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa391697f1501a5908b93ee14ad5a867aca03377e7bed8416adf81af1af368efc. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CA5KR1906117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534855338e5938c69eb8a944d2e923babe29f90650a5ecc39083997d098e01a7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CA5KR1906124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d97ec04f98a1a4d675d7f49458cbe857fcb2cc8e06fcec69c56aab3864f5c52. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR1906121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936540303d1f2458751a1f832085c8f97ec37fe4ec9707941cfaf6cd837e36f7. 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/CA5KR1906127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0438ce59861373182d69233da705595ab9f7c5042ef3ebc79dd568bacaa0ba2. 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/CA5KR1906122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63fbc790a781e83e709026b46c87756ac6cfe30284593ed63c4dfe172684521. 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/CA5KR1906116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf475834a18ce4be6cc99954aeb80d291fa4afd368a146bfcb5b0e14fcef3ac8b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CA5KR1906123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b02b5c4bcc40a96127f002c871b82c0cb850ae478f210b986fd1e9529de4232. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/CA5KR1906131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cce131ab6c7a97341e57676adb7214126c0198ede792032d468e09c91f0a593. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CA5KR1906129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69fb5e864da998d1848038a96f93476ec0985c65feba47200ba316d5f1ddb46. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/US25X2004428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8f7fcef52ed3039c483f09b6fe7c47af4d6019d6218ebc43837e9196ba3383. 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/US25X2004430.