Legal document verification
Legal records that hold up when it matters most
Stamp wills, trusts, contracts, and power of attorney documents to the blockchain. Create an immutable audit trail that proves authenticity, prevents disputes, and gives your clients peace of mind.
The problem
Legal documents are vulnerable at every stage
Critical legal records — wills, trusts, contracts — are stored as ordinary digital files with no built-in protection against tampering, loss, or dispute.
A PDF will or contract can be modified without leaving a trace — AI tools make convincing forgeries trivial to produce
There is no reliable way to prove when a document was created, whether it has been modified, or that the version in hand is the original
When authenticity is questioned during probate, litigation, or enforcement, proving a document is genuine can take months and thousands in legal fees
Why blockchain
An immutable chain of custody for every document
Stamping legal records on the blockchain creates a permanent, verifiable proof of authenticity that no one can alter — not even Chainletter.
Mathematically sealed
Each document is cryptographically hashed and stamped on the blockchain. Any modification — even a single character — produces a completely different hash, instantly exposing tampering.
Permanent proof of when
The blockchain records the exact moment a document was stamped, creating an irrefutable timestamp. Prove when a will was executed, when a contract was signed, or when terms were agreed.
Instant authentication
Anyone with the document can verify its authenticity in seconds — opposing counsel, a court, a beneficiary, or a notary. No phone calls, no waiting, no ambiguity.
What you can stamp
Every document your firm produces
Chainletter works with any digital file. If your firm creates it, you can stamp it.
Stamp the executed version to prove it hasn’t been altered — eliminating the most common challenge in probate disputes
Revocable and irrevocable trust documents with a verifiable record of the original terms and any amendments
Healthcare proxies, financial POAs, and durable powers with blockchain proof of execution date and content
Business contracts, NDAs, settlement agreements, and partnership documents with an immutable audit trail
Real estate deeds, vehicle titles, and property transfer documents with permanent proof of authenticity
Preserve the integrity of exhibits, affidavits, depositions, and any document submitted in legal proceedings
Use cases
Where blockchain stamping changes the outcome
Real scenarios where tamper-proof records prevent disputes, reduce costs, and protect your clients.
Prevent will contests before they start
A stamped will has a blockchain-verified timestamp and content hash. When a beneficiary challenges authenticity in probate, the verifiable record settles the question in seconds — not months of litigation.
Lock contract terms at execution
Stamp the signed version of any contract, NDA, or agreement. If a party later claims the terms were different, the blockchain hash proves exactly what was agreed and when — irrefutably.
Build an auditable document trail
Regulated industries need proof that documents existed in a specific form at a specific time. Blockchain stamping creates an automatic, immutable audit trail that satisfies compliance requirements without manual processes.
Preserve evidence integrity
Stamp exhibits, affidavits, and depositions at the time they’re created. If opposing counsel questions authenticity, the blockchain record provides definitive, independently verifiable proof.
Two ways to get started
Platform or API — up and running in minutes
Whether your firm wants a turnkey stamping portal or full integration into your document management system, Chainletter meets you where you are.
Stamping platform
A fully hosted, private-label portal where your team uploads documents and stamps them to the blockchain. No coding required. Set up in minutes, stamp documents in seconds.
Includes:
Custom-branded portal at your subdomain
Drag-and-drop file upload
Automatic blockchain stamping and timestamping
Secure distribution to clients and counterparties
Public verification page
Works with any file type (PDF, DOCX, images)
Stamping API
Integrate blockchain stamping directly into your document management system, case management software, or any application your firm already uses.
Includes:
File upload and management API
Blockchain stamping via webhook
Real-time SSE event streaming
Full OpenAPI / Swagger documentation
Batch stamping for large document sets
Implement in hours with a few lines of code
How it works
From document to verifiable record in seconds
Whether you use the platform or the API, the process is the same.
Why Chainletter
A new standard of trust for legal records
No blockchain expertise required. No crypto wallets. No disruption to your existing workflows.
Your firm’s branded stamping portal is live the same day — no IT project, no procurement cycle
No wallets, no tokens, no blockchain knowledge — just upload, stamp, and distribute to clients
Compatible with any document management system, case management platform, or file storage solution
Cryptographic hashes create proof that AI tools cannot forge, replicate, or reverse-engineer
Records are verified against the public blockchain — your documents remain verifiable even if Chainletter ceased to exist
Offer clients a level of document security that differentiates your firm and builds long-term trust
Backed by Qubic Labs — Proud recipient of a 2025 development grant from blockchain accelerator Qubic Labs.
Get started
Start securing your firm’s legal records today
Your firm can be stamping verifiable legal documents in minutes. No blockchain experience required.
