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 0x5b38729998ca49064a33fb7e667b234d2a8866eab4f6eeda3097893c036983de. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c6c88424-7c23-497d-beab-d5a3400088c9.json and https://artists.proofprofile.net/proofs/artist/c6c88424-7c23-497d-beab-d5a3400088c9.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 0x36ecc0ebc9a09e074d1b6fcb0807f27a6aad5e567eb537b4aff852f33cc50ada. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZES62278839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383c9965c2dc18c0d6f18319c25ef779593d31ee865d9bfd6d424fe2c2a5d1f8. 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/QZES62278840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3540d094bdeeaae9dfbdcf207828f0962eca7a3754e4c69b61b8a9cd966d2500. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZES62278841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ccd47b4e35bd0e4511024680061b78cea85d4442ef3fc7b4acb3c1d78d87cd. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES62278842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a8272dd558424b17f09c0cafcbcaed50ba3eea6f1b64d7f6b1fe759702c7ab. 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/QZES62278843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c72a10676f17ec21311c0f6d6ad46acaf87e80cf70882a0bf4a1773ec08dad. 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/QZES62278844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c05b561ed6a9db3deeaf39b03084dd07d607803ba3fba6b618d5e358f9c7997. 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/QZES62278845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022f9bfd9f1bb82ae52cc6a873f842b9514d778556edd62bc5d40d6bea6fd7d2. 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/QZES62278846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e4e726b62a68f9a82e5497cc344385e1f774dcf338a6fe0eaf671ab4e036f6. 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/QZES62278831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d68cab404cda84d822304914492bc4c65b5ddfb65f4f7979396de8e68e0dc13. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZES62278832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e1cc69857cea8e1172e8a3f5a20e798cb9f5816b9bf3ccdd31639a7d6ffd82. 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/QZES62278833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8be54b1360e14b2a8300c7cd143eb0d39fc6c96f2b96f4fca4f8d453cdaa207. 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/QZES62278834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7db0550982bea5d058c66dc6767cc5ba80f12f62e065b3993b50d3a0cbd934. 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/QZES62278835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b92ef376c4763f739b27ac3ebc068d2785736f1c1d74d1cf91e3c525556a076. 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/QZES62278836.