E2, e2, E02, E.II, e or E-2 may refer to: Science and technology E2 reaction, a type of elimination reaction Honda E2, one of the predecessors of Honda's ASIMO robot E2, a communications channel d
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 0x5d0801692a5b3fc1b18b3403d284ace3d5fb09c1da5e24aa72e69e2beb4b7b6f. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0101c8a-3644-473d-806e-902bdcd0a9c9.json and https://artists.proofprofile.net/proofs/artist/c0101c8a-3644-473d-806e-902bdcd0a9c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).