Solutions
A turnkey platform and a flexible API — your choice
Chainletter gives you two ways to start stamping tamper-proof digital records. Use the platform with zero coding, or build something entirely new with the API. Either way, you’re up and running in minutes.
The platform
Start stamping records — no coding required
Our turnkey platform is ready to go for higher education and legal markets. Your organization can be stamping blockchain-verified records the same day — with a branded portal, drag-and-drop upload, and instant distribution.
Upload files, stamp them to the blockchain, and distribute to recipients — all from a visual interface
Your organization gets a custom-branded subdomain with your logo, colors, and verification page
No procurement cycle, no IT project. Set up an account and start stamping the same day
Platform markets
Ready-made solutions for two key markets
Purpose-built platforms that solve specific problems — ready to deploy today.
Higher education credentials
Stamp diplomas, transcripts, certificates, and badges that graduates can share instantly with employers, licensing boards, and other universities.
Institutions get:
Branded credential portal
Drag-and-drop file stamping
Recipient email distribution
Public verification page
Works with Canva and LinkedIn
No blockchain expertise needed
Legal document verification
Create verifiable wills, trusts, power of attorney, and contracts with an immutable chain of custody that holds up when it matters most.
Law firms get:
Branded stamping portal
Tamper-proof timestamping
Secure client distribution
Instant verification for any party
Works with any file type
No blockchain expertise needed
How the platform works
From file to verified record in seconds
The API
One endpoint. Build whatever you imagine.
Upload files, stamp them on-chain, verify hashes, stream events, and generate signed links — all through a single REST path with header-based routing. No blockchain libraries. No IPFS nodes. Just HTTP.
Upload & stamp
Upload a file with one POST request and stamp it to the blockchain immediately. Chainletter handles IPFS pinning, CID computation, and on-chain indexing.
List & verify
List groups, list files with bulk status checks, or verify any hash against the blockchain — three workflows through one GET endpoint.
Real-time events
Open an SSE connection and receive events the moment they happen — file uploads, stamp confirmations, failures. Build reactive systems without polling.
Upload files into a group over time, then stamp them all on-chain in a single PATCH request
Generate time-limited upload URLs for end users — no proxy needed, no keys exposed
API key in the path, secret key in the header. That’s the entire auth model
What’s possible
The API is open-ended by design
The platform solves known problems. The API lets you invent new ones. We’re excited to see what organizations build — here’s one example of where it can lead.
DSoul used the Chainletter API to build a decentralized platform where humans and AI agents publish, discover, and execute verified AI skills. Chainletter verifies creator identities on the blockchain and freezes every published skill on IPFS — creating a tamper-proof supply chain from author to consumer. The entire integration was built in days.
Why Chainletter
Blockchain verification without the blockchain complexity
No wallets, no tokens, no blockchain knowledge — just upload, stamp, and distribute
Cryptographic hashes create proof that AI tools cannot forge, replicate, or reverse-engineer
Records are verified against the public blockchain — your trust layer survives no matter what
Compatible with any LMS, document management system, AI agent framework, or custom application
Clean OpenAPI specs make it easy for AI assistants and autonomous agents to integrate directly
Stamp one file or ten thousand — batch operations, auto-expanding groups, and real-time events
Backed by Qubic Labs — Proud recipient of a 2025 development grant from blockchain accelerator Qubic Labs.
Get started
Ready to stamp your first record?
Whether you choose the platform or the API, you’ll be stamping verifiable records in minutes. No blockchain experience required.
