Benoît Poher (; born 27 June 1979) is a French singer, songwriter and lyricist. He is the lead singer of French rock band Kyo and was the lead singer in the supergroup Empyr. Early life Poher was bor
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 0x42ec87c6d025a1ed780aa6e53c56df7fddf5c900317decfda0547492b2e57524. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dd522da-f38c-48aa-9d3f-440475a3ad19.json and https://artists.proofprofile.net/proofs/artist/0dd522da-f38c-48aa-9d3f-440475a3ad19.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.