Threat modelling & cryptographic design
What you protect, from whom, and where the keys live — before the first commit.
Satoshi Ltd. · Software studio · Hong Kong · Since 2020
Software that
answers to you.
A small studio that designs, builds and ships software that runs on hardware you control — no account with us, no telemetry, no server of ours in the middle.
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01 / The drift
Somewhere along the way, software stopped being yours.
Files moved to someone else's computer. Every app started asking for an account, a subscription and a little of your data. That was a design decision — and design decisions can be undone.
02 / The unit
Indivisible. Permissionless.
A satoshi can't be split, and it doesn't ask anyone's permission to exist. That is how we want software to feel: privacy, autonomy and sovereignty over your own data, built in rather than promised.
03 / Practice
A small team. A handful of engagements a year.
Discovery · 1 weekDelivery · 6–12 weeksRetainer · ongoing
Self-hosted AI agents
Agents that run on your own infrastructure, with the model provider and the keys you choose.
Local-first product engineering
Storage, sync and offline-first apps for mobile and desktop.
Security and code review
A second pair of eyes on the parts that matter most.
04 / Rules
Six rules we don't break.
No account
Our software works without an account with us.
No telemetry
Our software ships no analytics, crash-reporting or tracking SDKs.
No middleman
No Satoshi server sits between you and your data.
Exportable
Your data lives in files you hold, ready to back up or take elsewhere.
Readable source
Our code is public, so anyone can read and review it.
Your keys
Passphrases, device keys and provider keys stay with you.
05 / Aim
Make private the default, not the premium.
Privacy shouldn't feel like a sacrifice. We want software you control to be the obvious choice: calmer, faster and better made than what it replaces.
“What we don't know can't be subpoenaed, leaked, or sold.” Satoshi Ltd. · Principles
We use what we build
alpi-agent.com arca.satoshi-ltd.com money.satoshi-ltd.com splitpass.satoshi-ltd.com
06 / Engage
Have a brief? Let's scope it.
Free 30-minute intro. NDAs on request. Signal @satoshiltd if you'd rather not use email.