# vBTC and vBTC.b Technical

## vBTC V2 Technical Specification

Revised edition for VerifiedX Core 9.0: the key ceremony and its on-chain binding, Bitcoin attestation, vault accounting, consensus-fixed withdrawals, key maintenance, S3C, transaction types, parameters and network heights, and the protocol's security properties and assumptions. It replaces the edition withdrawn in September 2026.

<DocumentDownload href="/documents/vBTC-V2-Technical-Specification.pdf" cover={v2Cover} title="vBTC V2 Technical Specification" />

## vBTC.b Technical Specification

<DocumentDownload href="/documents/vBTCb-Technical-Specification.pdf" cover={vbtcbCover} title="vBTC.b Technical Specification" />