Sepol (; , Sepöľ) is a rural locality (a village) in Kochyovskoye Rural Settlement, Kochyovsky District, Perm Krai, Russia. The population was 407 as of 2010.численность населения городских округов, м
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 0x07d62b9680d0c18143d2064fa77f51e2773c7b154d15ae1632051748be27eeb0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df52949e-2b15-4711-94c0-53d8475d1187.json and https://artists.proofprofile.net/proofs/artist/df52949e-2b15-4711-94c0-53d8475d1187.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).