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 0xcd5610458edda429a094f19d0a8594acbc02db25cf743e97b9d5bebbe34fc603. 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/34ac4221-e9d8-4b09-8ee9-448901979973.json and https://artists.proofprofile.net/proofs/artist/34ac4221-e9d8-4b09-8ee9-448901979973.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 0xcb7c1fcac11ae8c1155c429ecb53d6db30c39dbd39b480bed564b3685f20968c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU1568304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87540feee4b15463e9f77e001718dfc20a5d5b2e9201937ca4fa67bddfd54795. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ESA011806763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06317ccf103819d63e446895088cd1bd724a4bedde35cb2cf65bb05a2d46d804. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES20S1700077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb05f76ccafc39583a5f86bed8a3fafa16b46994ff5ecd753af0f1afcfef27c8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFK2198549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13979a9d000dd0750b74288254d17c3a0b930fc16800cd1535db6ad1752bd777. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES16E2300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13979a9d000dd0750b74288254d17c3a0b930fc16800cd1535db6ad1752bd777. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES16E2300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e81847b8c57c3859685bc279b3838201daa14e5e4309f88fe78f228d4a438a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR5R00911229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8484b341706c2ea6c90b2fb6fbbebe26a185a65c94d7853c5c1d936c0c9a954. 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/FRPGB2219090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892245e32b6e7dd1d5597c289ddfa51bd2591fe3934d46e389253cb6154e5d55. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FRPGB2219130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08114c2636c421e0a98a9dad0b066a41fabad6e6e15e904eeff5e5232519f4e. 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/FRPGB2219220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfed4b91830690b1123042bd5e5953133e20aca91f04841cb8c61bec63756df. 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/FXQ802300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e31198bc95d8c0f65d397b9252699e70d9b8fe555ab805625d3c612a4829cf5. 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/FR5R02213417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e81847b8c57c3859685bc279b3838201daa14e5e4309f88fe78f228d4a438a. 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/FR5R00911229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c181fa8971380f70e983d9a61e38d243f4bb6fb890ca108d5a361a893d975d. 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/FR5R00912329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc46ab065a7bd2e0fe0681acb9662390a130c970759decead5064e2324fc9746. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/BRDEP1500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9d277d21555ac0b6b38c3fe3608d7c7bea24468c6c57a9483228b7b53b4cf0. 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/ES20S1700078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1581da48a330a03f8ceef4b3a7c2fe97787fcac22b22eda66bb6f1edd140f221. 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/QMFME2434851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5e5386b0602ea833ed433f456b91c6d8f09cdbb66ac538b550d33903b17a2a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ESA092315066.