Maktub

It is written.
And only for whom it is written.

A sealed letter that delivers itself when you go silent — and opens only for the person you chose.

Maktub delivers an encrypted message to the people you name, if you don't check in within a time you set.

One primitive

Recipients + Payload + Timer = Heartbeat

Name who may read it. Seal what you want delivered. Choose how long your silence may last. If your check-ins ever stop, Maktub does the rest — on its own, and only for them.


How it works

Three steps. Then nothing, until it matters.

  1. I

    Seal it

    Write what you want delivered — a letter, a password, a seed phrase, a set of documents — and choose who receives it. It is encrypted before it ever leaves your hands. Only your recipients hold the key.

  2. II

    Check in

    Set how long your silence is allowed to last. A tap before the timer runs out resets it, every time. As long as you're here, nothing is sent, and nothing happens.

  3. III

    If you go silent, it delivers

    Miss the window, and the protocol delivers — on its own, to the people you named, with no one able to stop it. Not us. Not anyone. It was written.


Stories

Some letters can only be written in advance.

The seed no one could find

Mara's father invested early, quietly, the way he did everything. After the heart attack there was a hardware wallet in the desk drawer and a recovery phrase that lived only in his head.


The family kept the device for three years like a locked house with no key. What he built is still there, and no one will ever walk back into it. He'd meant to write it down. He always meant to.

A seed phrase you can't pass on is a fortune that dies with you.

For my daughter

She set it up the week after her diagnosis, not knowing how much time she had. A letter to her daughter, sealed, set to deliver only if her check-ins ever stopped.


For two years she checked in, and the letter stayed shut — hers, private, unsent. When the silence finally came, the words she'd chosen carefully, while she still could, arrived exactly as she'd left them. Her daughter read them in her mother's voice.

Say it once, carefully, while you can. Let it wait, sealed, until it's needed.

The work that outlived the worker

She'd spent eight months on the investigation when the accident on the coast road took her off it for good. Notes, sources' protected contacts, the half-finished draft — all of it would have gone dark with her.


But she'd named two editors and set a timer, and when she couldn't check in, her work reached the only hands she trusted to finish it. The sources stayed protected. The story still ran.

Your work shouldn't end the day you can't continue it.

Day four, no message

Tomas hiked alone most weekends; it was the only quiet he could find. His sister never worried, because every trip he'd seal his route, his gear, and his emergency contacts to deliver if he ever went quiet too long.


The weekend he slipped on the ridge and lost his phone in the fall, the timer ran down on its own. By the time his silence delivered, the people who could reach him already knew exactly where to start looking.

If you go where help is far away, let your silence speak for you.

The password that locked everyone out

After Dad passed, the photos were all on his laptop — forty years of them, every birthday, the trip to the lake. The accounts, the subscriptions, the scans of the deed: all behind one password he'd never shared.


The family didn't need his money. They needed the picture of him holding the newborn grandson he barely got to meet. A single sealed note would have handed it all over.

Your digital life is a house with one key. Leave a copy for the people you'd want inside.

The thing left unsaid

There was a falling-out years back, the kind that hardens into silence on both sides. He'd written the apology more than once and never sent it — too proud while he was well, too late once he wasn't.


It sat in a drafts folder no one would ever open. If he'd sealed it to deliver in his absence, the last word between them wouldn't have been the argument. It would have been the truth he finally got to say.

Some words are too heavy to send today and too important to lose forever.

Who knows what's waiting

She met people the way most of us do now — a few messages, a first name, a face she'd only seen on a screen. Most evenings it was just dinner and a story to tell later. But you never quite know who's on the other side of a first date.


So before each one she sealed the details — his profile, where they were meeting, when she'd be home — set to reach her sister if she didn't check in by morning. Almost every time it stayed shut, unread. The one evening it might have mattered, someone would have known exactly where to look, and who she was with.

Meeting someone new shouldn't mean no one knows where you are.

The accounts only she could open

She ran three of the firm's biggest clients almost single-handed — the logins, the half-finished proposals, the context that lived nowhere but in her own head. Then a few days of leave quietly became something longer, with no notice and no handover.


But she'd sealed it: the credentials, the project notes, where things stood for each client, set to reach her second-in-command if she ever went quiet too long. The clients never felt the gap. Her work, and her team, carried on without her having to be there to hand it over.

A project shouldn't stall, and clients shouldn't be stranded, because one person can't be reached.

Whose letter is yours to write?

Explore the protocol

Why people reach for it

One primitive. Three reasons.

Safety

For the people who go where help is far away — hikers, field workers, anyone who travels alone. Seal your route, your contacts, what to do if you don't come back on time. Your silence becomes a signal, instead of a guess.

Your work survives you

For journalists, researchers, and anyone building something that shouldn't depend on them being able to finish it. If illness, an accident, or sheer absence ever stops you, the work and the people you trust to carry it are connected — automatically, privately, on your terms.

Digital estate

For the seed phrases, passwords, documents, and letters that would otherwise be lost the moment you are. Decide now what your people inherit, and exactly who can open it. Not a copy in a drawer — a sealed delivery that finds them when it's needed.


Open & verifiable

Built so that not even we can break the promise.

Delivery is inevitable

Maktub runs on immutable smart contracts on Base that cannot be changed, paused, or shut down — not by us, not by anyone. No recall, no edit. Once it's written, it will be carried out.

Only the reader can open it

Everything is end-to-end encrypted before it leaves your device. Only the recipient you named can open it — not us, not the network, not anyone watching.

We never hold your assets

Maktub delivers encrypted information, never custody. To pass on a wallet, you seal its credentials as a message; your recipient claims the wallet themselves. We touch none of it.

Open from end to end

The code is public, under the MIT license. Read it, audit it, run it yourself. Trust here isn't asked for — it's verifiable.

Honest about what's public. Maktub guarantees that your message is delivered and that only your reader can read it. It does not hide that a delivery exists: the protocol lives on a public blockchain, so the fact that a sealed letter is waiting — and who it points to — is recorded on-chain and cannot be hidden. We protect the contents, not the secret of their existence. We'd rather earn your trust with the truth than with a claim we can't keep.

Read the protocol →


Build on Maktub

Maktub is a protocol. Build on it.

One primitive, immutable — no governance, no admin, no pause. Live on Base Sepolia today; mainnet follows, gated on a clean audit.

مكتوب

It is written. And only for whom it is written.

Explore the protocol