Formal Methods Meet Audit
AssureTwin is built on mathematically rigorous foundations — the same techniques used to verify aircraft software and microprocessor designs.
DataSynth Engine
DataSynth is a Rust-native synthetic data engine purpose-built for audit simulations. It generates complete financial datasets with the same statistical properties as real enterprise systems — journal entries, trial balances, master data, controls — all without touching real client data.
FSM Verification
Every audit procedure is modeled as a finite state machine. The engine tracks every transition, validates preconditions, and ensures no illegal state is ever reached. This provides a mathematical guarantee that audit procedures follow the defined methodology.
enabled_actions(state) Returns all valid transitions from the current stateapply_action(state, action) Applies a transition and returns the new stateverify_trace(trace) Validates an entire execution trace against the FSMLTL Verification
Linear Temporal Logic (LTL) lets us express audit requirements as mathematical formulas that must hold across all possible execution paths. If a property fails, you know exactly which trace violated which requirement.
G(planning_complete -> F substantive_testing) Planning must always eventually lead to substantive testing.
G(material_misstatement -> F(escalation U partner_review)) Every material misstatement must be escalated until partner review.
!substantive_testing U risk_assessment Substantive testing cannot begin until risk assessment is complete.
Methodology Blueprints
Each blueprint encodes a complete audit methodology — procedures, dependencies, judgment levels, ISA references, and decision gates — all defined in YAML and executed by the FSM engine.
KPMG, PwC, Deloitte, and EY are trademarks of their respective owners. AssureTwin has no affiliation with these firms. Our methodology blueprints are based on ISA (International Standards on Auditing) requirements with additional modelling derived from publicly available information. They represent educational simulations of audit approaches, not proprietary Big 4 audit methodologies. For actual firm-specific audit procedures, consult the respective firms directly.