RSA and ECDSA — the algorithms behind DocuSign, Adobe Sign, and every signed PDF — will be broken by quantum computers. The certificate authorities that issued the signing certificates will shut down. Your clients' merger agreements, trust documents, and IP assignments will become unverifiable. H33 fixes this with one integration. Your attorneys change nothing.
Six capabilities that protect every document your firm touches — from signing through decades of storage, amendments, renewals, and litigation.
RSA signatures break when quantum arrives. Certificate authorities shut down. OCSP servers go offline. Your signature exists but the proof decays.
SLH-DSA hash-based signatures that survive quantum. RFC 3161 timestamps from H33's own Timestamp Authority with a 50-year operational commitment. Certificate chain and revocation status embedded at signing time — self-contained, no server needed for verification.
Attorneys won't adopt new tools. Any change to how they save, sign, or manage documents will be rejected.
iManage and NetDocuments plugins intercept the save event automatically. The attorney saves exactly as before. The PQ signature, timestamp, and certificate chain are stored as metadata. No new software to learn. No new buttons to click. Nothing changes.
Contracts get amended. Section 7.3 changes. The closing date moves. The non-compete gets extended. Each amendment needs its own signature, its own timestamp, its own proof.
Change one clause — H33 signs just the amendment, links it cryptographically to the original. Full version chain with redline diffs between any two versions. Every change is PQ-signed and timestamped independently.
Contracts renew annually. Leases extend. Employment agreements update. Someone has to remember to re-sign with current algorithms.
Set a schedule — annually, quarterly, on-expiry. H33 auto-signs with the strongest current PQ algorithms. Notification emails go out before each signing. No attorney action needed.
Amendments require approval from multiple partners. Who approved what, when, and in what order matters legally.
Configurable threshold authorization — e.g., 2-of-3 partners must approve before an amendment takes effect. Every approval is individually PQ-signed with a timestamp. The approval chain is tamper-proof.
Opposing counsel challenges: “How do you know this wasn't altered?” Discovery requests demand the complete chain of custody for every document version.
Hash-chained version history where every amendment, every approval, every signature event is cryptographically linked. Independent verification with open-source software. No reliance on H33 being available — the proof is self-contained.
Three steps. Your entire document library goes from vulnerable to quantum-safe.
Plug H33 into your DMS — iManage, NetDocuments, SharePoint. One IT configuration. Takes 30 minutes.
Bulk re-sign existing contracts overnight. 50,000 documents in hours. Original signatures preserved. PQ signatures added alongside.
Every new document automatically signed with PQ. Auto-renewal on schedule. Clause amendments tracked. Your firm is quantum-safe.
Every capability runs on the same cryptographic stack. No bolt-on components.
| Capability | H33 Component | Standard |
|---|---|---|
| Document signatures | SLH-DSA (SPHINCS+) | FIPS 205 · Hash-based |
| Timestamps | RFC 3161 TSA | 50-year operational commitment |
| Certificate embedding | Self-contained proof bundle | No OCSP dependency |
| Clause-level signing | Merkle-linked amendment chain | SHA3-256 hash chain |
| Multi-party approval | Threshold PQ signatures | Configurable k-of-n |
| Automatic renewal | Scheduled re-signing daemon | Algorithm-agile upgrades |
| DMS integration | iManage / NetDocuments plugins | Save-event intercept |
| Verification | Open-source verifier | No vendor lock-in |
Every practice area that produces documents with multi-decade legal significance.
Four tiers covering everything from bulk migration to dedicated infrastructure.
1 unit per document. $0.05/unit without a plan. $0.001/unit on Enterprise+. A firm with 50,000 contracts migrates for as little as $50. See all plans →
Protect them with signatures that last. Every contract, every amendment, every renewal — quantum-safe from the moment it's signed through decades of legal relevance.