Avril means April in French and other languages. It may also refer to: Places Mont Avril, a mountain on the Swiss-Italian border Avril, Meurthe-et-Moselle, a commune of the Meurthe-et-Moselle dépar
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 0x32f7db98e58124da9f8d84f46db5287ee3c98f374f5065716306d35cb93bc142. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55721c9b-32a3-4884-a3a5-3a155224adec.json and https://artists.proofprofile.net/proofs/artist/55721c9b-32a3-4884-a3a5-3a155224adec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).