Prove a document hasn’t been touched since it was signed.
Mitra takes its name from the ancient Iranian god of the covenant — the word itself means “contract.” It seals every contract and invoice a client closes into a witnessed, Bitcoin-anchored ledger, so the proof that a document is original doesn’t depend on trusting any one company’s word — including ours.
Registered businesses
4
Days closed and sealed
5
Documents sealed
36
Bitcoin anchors confirmed
2
■ The live ledger
This is not a mockup — it’s the actual explorer, reading the actual chain, updating as new days are sealed and new Bitcoin anchors confirm.
Want to check a document yourself? Drag it onto the verification page — nothing to install, nothing sent anywhere but your own browser doing the check.
■ How it actually works
A document is fingerprinted, not stored
When a client’s system closes a document — a signed contract, an issued invoice — it hashes the file (SHA-256) and throws the fingerprint into that day’s batch. The document itself never leaves the client’s own server; Mitra never sees the content, only its fingerprint.
A day becomes one number
At the end of the day, every fingerprint from that day is combined into a single Merkle root — one number that changes completely if a single byte of a single document changes. That root, plus the previous day’s root, plus a public Bitcoin block hash from that moment, are combined into the day’s seal and written to a private chain.
The chain is witnessed, not just self-signed
Client staff can be enrolled as witnesses. Their browser generates a signing key that never leaves the device — the private half is marked non-extractable in WebCrypto, so not even ra.studio can export it. A witness sees only the date, the day’s seal, and how many documents it covers — never the documents — and signs it as real.
The chain is anchored to Bitcoin
Every few blocks, the current state of the whole chain is stamped into the Bitcoin blockchain via OpenTimestamps. Because a Bitcoin block hash covers everything before it, one confirmed anchor fixes the entire history up to that point — nobody, including ra.studio, can quietly rewrite a sealed day afterward without the rewrite being detectable.
Anyone can verify, with nothing to install
Drag the original document onto the verification page. It’s hashed in the browser, checked against the sealed root for that day, and the page shows a plain yes/no — unaltered since it was sealed, or not — with the company’s name on the result.
■ What Mitra does not claim
- —It proves a document is unaltered — not that it is true, fair, or legally binding.
- —It is not (yet) fully decentralized: some signing keys still live on ra.studio’s own server, stated here rather than hidden. Full independence lands as each client takes its own keys.
- —It is not a public general-purpose blockchain, and doesn’t try to be one — see the FAQ below.
■ Frequently asked
What does Mitra actually prove?
That a specific document existed in that exact form on the date it was sealed, and hasn’t been changed since. It does not prove the document is true, correct, or legally binding — only that it hasn’t been silently edited after the fact.
Is Mitra a public blockchain?
No. It’s a single-writer permissioned ledger — ra.studio’s infrastructure decides what gets written each day — with third-party witnessing and a daily anchor into Bitcoin, the public chain, for tamper-evidence. That combination gives most of what people mean by “blockchain proof” without running a public network no one asked for.
Who holds the keys?
Today, some signing keys still live on ra.studio’s own server — that’s stated plainly, not hidden. Full independence arrives once each client holds its own keys; that migration is in progress, one client at a time.
What happens if ra.studio disappears?
Every sealed day is already anchored into the Bitcoin blockchain, which does not depend on ra.studio staying online. The historical proof survives; only the ability to seal *new* days would stop, until operation moved to new infrastructure.
Which companies use Mitra today?
Lion Global Sulphur, Tepe Watersports, Noventura Living, and Bodrum Life Yacht are registered on the network as of September 2026, with 36 documents sealed across 5 closed days.