Yasan () is a village in Pir Kuh Rural District, Deylaman District, Siahkal County, Gilan Province, Iran. At the 2006 census, its population was 44, in 14 families. Up to 45 people in 20 households in
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 0xc9df675fa2d1f97dbd0efaf21ad5111615bc33ac922cb5f953970faf93c2d908. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3876a387-0f65-44c2-aa14-9425b578998c.json and https://artists.proofprofile.net/proofs/artist/3876a387-0f65-44c2-aa14-9425b578998c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.