Evidence Engine
Signs every decision, batches them into a Merkle root, anchors it on Hedera, and lets anyone verify a record offline.
What it does
The Evidence Engine signs every decision with Ed25519, batches signed decisions into a Merkle tree, and anchors the root on Hedera Consensus Service. Because the record is kept byte-for-byte as signed, anyone can verify a single decision offline — signature, Merkle inclusion proof and anchored root — with the platform completely offline.
Inside Evidence Engine
The core functions this engine provides across the Trust Fabric.
Evidence Engine composes with the Trust Fabric
Every engine is independently useful and interoperates through one API-first Trust Fabric — so identity, evidence, policy, risk and certification stay consistent across your AI estate.
Related engines
Audit Engine
Turns the signed evidence into a reconstructable, regulator-ready record — with inclusion proofs against an anchored root.
- Immutable audit / regulator log
- Merkle inclusion proofs
- Reason-code decision trail
- Downloadable, offline-verifiable
Supervisory Access
A scoped, revocable seat for a regulator or supervisor — with a hash-chained log of everything they read.
- Grant-based, time-bounded access
- Scoped to decisions, controls or proofs
- Hash-chained access log
- Readable by the supervised organisation
Trust Engine
Computes a signed, HCS-28 trust score per agent from its verified identity and governance track record.
- HCS-28 Trust Index
- Weighted adapters + coverage
- Drift monitoring
- Signed, publishable records
See Evidence Engine in action
Book a demo and see how the platform establishes trust across your AI systems.