LEDGER
Compliance Without Storage
Proves every decision without storing a single log.
Every inference request generates a cryptographic receipt — linked to the previous receipt via hash-chain, signed with ML-DSA post-quantum signatures. Full audit trail. Zero petabytes of log storage. The blockchain principle applied to AI compliance — without the blockchain.
Logging Everything Is Unsustainable.
Proving Everything Is Not.
⌠Traditional Audit Logging
Every request → Full log stored → Petabytes → $$$
- Full prompt + response stored per request
- At OpenAI scale: petabytes per month
- Storage costs: $500M+/yr
- Searchability degrades with volume
- PII exposure risk in stored logs
✅ LEDGER Hash-Chain
Every request → 64-byte receipt → Hash-chain → $0.05
- Only the cryptographic proof is stored
- 64 bytes per request (vs. ~10KB traditional)
- Storage: 99.99% reduction
- Tamper-evident: any modification breaks the chain
- Zero PII in audit trail (hashes only)
Hash-Chain Receipts — The Blockchain Without the Blockchain
Hash
Each request (prompt + response + metadata) is hashed into a 64-byte BLAKE3 digest. The full data is NOT stored.
Chain
Each receipt includes the hash of the previous receipt — creating an unbreakable chain. Any tampering invalidates all subsequent receipts.
Sign
ML-DSA (FIPS 204) post-quantum digital signatures make each receipt legally admissible and quantum-computer-resistant.
Export
Receipts exportable per customer, session, or time range. Auditors verify the chain independently — no trust in DESTILL.ai required.
Every Other Product Writes to LEDGER.
🇪🇺 EU AI Act Art. 53
General-purpose AI providers must document and monitor their systems. LEDGER provides the documentation layer — cryptographic proof of every decision, every request, every response.
🔒 Post-Quantum Security
ML-DSA (FIPS 204) signatures ensure receipts remain valid even after quantum computers break RSA/ECDSA. Your 2026 audit trail survives 2036 quantum attacks.
âš–ï¸ Legal Admissibility
Hash-chain receipts meet the evidentiary standards for digital audit trails in EU jurisdictions. Cryptographic non-repudiation provides stronger proof than server logs.
ðŸ—ï¸ Foundation Layer
LEDGER is the foundation that all 7 other NI Stack products write to. AEGIS logs threat detections. STENO logs compression ratios. SIREN logs quality scores. One unified audit chain.
Petabytes of Logs — Replaced by Kilobytes of Proof.
| Cost Category | Traditional Logging | LEDGER Hash-Chain | Impact |
|---|---|---|---|
| Storage per 1B requests | ~10 PB ($500M+/yr) | ~64 GB ($12/yr) | 99.99% reduction |
| Audit preparation time | Weeks (search petabytes) | Seconds (verify chain) | 1000× faster |
| PII exposure risk | Full prompts stored | Hashes only (zero PII) | Risk eliminated |
| Quantum vulnerability | RSA/ECDSA (breakable) | ML-DSA FIPS 204 | Future-proof |
| At 1M req/month | $8,500/mo (storage + ops) | $85/mo | $8,415/mo saved |
Prove Everything. Store Nothing. Comply Instantly.
LEDGER runs as the foundation layer of api.destill.ai/v1. Every request gets a receipt.