Open source
The Bitcoin engine that holds your keys is public code. Read every line.
Check:the paper trail, Nº 01
A self-custody Bitcoin wallet
Your Bitcoin.
Actually simple.
Hold your own without becoming an expert. The app explains each step as you go, and a lost phone is an inconvenience, not a disaster.
Get early accessNew to Bitcoin? Start with the basics
Open source · Yours, not ours · Bitcoin only
In brief
Nº 2
Truly yours
Your stay on your device. We can’t freeze, seize, or even see your funds.
See the stress test01Features
One app. Everything in its place.
Your balance, plain sends, and a library that explains it all: no jargon, no clutter.
Plate I. Home
BAD WALLET · BITCOIN
Bitcoin balance
0.05000000BTC
Received+0.01000000
Sent−0.00250000
ReceiveSend
Everything you own, at a glance.
Plate II. Send
BAD WALLET · BITCOIN
Send Bitcoin
Tobc1q4x…7k2v
Amount0.00250000 BTC
We double-check the address for you.
Review send
Sending, without the sweat.
Plate III. Library
BAD WALLET · BITCOIN
Library
3 of 32 guides read
What is Bitcoin, actually?Read ✓
Your seed phrase is everything6 min
What are sats?4 min
The library, built right in.
02Method
How it works
- 01
Create your wallet
Generated on your device in seconds. No account, no email, no bank.
- 02
Back it up, the easy way
Twelve words, one guided backup you’ll actually finish. No mysteries, no panic.
- 03
Send and receive Bitcoin
Plain, fast, and entirely under your control.
No account · No email · No bankEverything happens on your phone
03Learn
Understand Bitcoin. Don’t just hold it.
Most wallets hand you the keys and wish you luck. Bad Wallet ships with a full learning center: 32 plain-language guides and a glossary that treats you like a human, not a .
Not your keys, not your coins.
Start hereBasics5 min read
What is Bitcoin, actually?
Strip away the hype and Bitcoin is a simple idea: money the internet can move, that no company or government runs. Here’s the plain-English version.
BeginnerRead Security6 min readYour seed phrase is everything
Twelve or twenty-four little words are the master key to your entire wallet. Lose them, lose your coins. Here’s how to treat them right.
BeginnerRead Going Deeper5 min readPublic keys, private keys, and addresses
Three words that sound interchangeable and aren’t. Get the key pair straight and self-custody finally makes sense under the hood.
IntermediateRead32
Guides at launch · Full glossary · EN & FR
04The map
Why not just use what’s already out there?
Every money app makes the same trade: ease of use against who really holds the keys. Put the field on a map, and one corner stays empty.
- Banks & exchanges. Easy to use, their custody
- Hardware wallets. Your keys, hard work
- Bad Wallet. Easy to use, and your keys
The top-right quadrant was empty. So we moved in.
What you actually get
| Capability | Bad WalletSelf-custody with a teacher built in. | Custodial appsExchanges and finance apps that hold your Bitcoin for you. | Typical self-custody walletsYou hold the keys, if you can handle the learning curve. |
|---|---|---|---|
| You hold your own keys | Yes | No | Yes |
| Built for beginners, in plain English | Yes | Yes | No |
| Buy Bitcoin straight to your wallet | Yes | No | Partial |
| Hot + cold wallets in one place | Yes | No | Partial |
| AI guide + learning center built in | Yes | No | No |
| No account, no KYC to get started | Yes | No | Yes |
| The score | 6/6 | 1/6 | 3/6 |
You shouldn’t have to choose between owning your Bitcoin and understanding it. Bad Wallet is the one that refuses to make you.
Bad for banks
Banks ask for permission slips. Bitcoin asks for nothing.
No account to freeze. No branch to call. No one standing between you and your money. That’s what makes it bad for banks, and good for you.
05Proof
Don’t take our word for it.
Four claims, four public documents. Bring your own magnifying glass, or use ours.
Your keys, your coins
by design. We never hold your Bitcoin, so we can’t freeze it, lose it, or hand it over.
Check:the paper trail, Nº 02
Nothing to breach
Our servers never see your keys or your coins. Break in and there’s nothing to steal.
On our servers:0 keys · 0 coins
No account, no KYC
No name, no email, no ID. We can’t leak what we never collect.
We ask for:nothing
The paper trailPull any of these yourself
- Nº 01github.com/Sour-Labs/btc-wallet-kmp The Bitcoin engine, public on GitHub. Every line that touches your keys.
- Nº 02badwallet.app/security The security model in plain English. Six questions, nothing hand-waved.
- Nº 03bad-wallet-security-protocol.md The protocol document itself. Plain text, no design, no spin.
- Nº 04badwallet.app/features.json Every claim the app makes, machine-readable. Feed it to your own AI and ask.
06What’s inside
The classifieds.
Everything we sell, give away, refuse to carry, or lost on purpose. In print, where it's binding.
For sale
Software. Not you. No trackers, no data brokers, no surveillance business model. We sell a wallet; that's the whole company.
Free
The Bitcoin engine. , every line public. Read it, fork it, keep it. No purchase necessary.
Lost
One bank. Last seen standing between you and your money. If found: don't return.
Wanted
Nobody. No account, no ID, no , no permission slips. Open the app, get a wallet.
Not accepted
Altcoins. Bitcoin only. House rule, no exceptions, don't write in.
Services
Jargon translated. , , : rendered into plain English, free with every wallet.
Property notice
Your keys, your coins. Held by you, on your device, from day one. is not transferable.
Your ad here?
No. Never.
Rates: free forever · Deadline: none · Complaints: to your bank
07Security
Your worst day, already rehearsed.
- Test 01
Your phone is stolen
Your twelve words restore the wallet on a new phone, with recovery that walks you through it.
Coins: safe - Test 02
Our servers are hacked
The loot is a . It can watch a balance, never spend one. There is nothing worth stealing.
Coins: safe - Test 03
Sour Labs disappears
Your keys never lived with us. A standard opens your wallet in any standard Bitcoin wallet.
Coins: yours - Test 04
You’re brand new at this
Start with a little until it feels like home. The app teaches before it lets you leap.
Eased in
The stress test: four disasters, printed with their endings
Read the full security modelEarly access
Ready to hold your own Bitcoin?
Early accessNº 000021
Your ticket out of the banking line.
No spam. One email with your download link when it’s your turn.
Bitcoin only · Self-custody · Android & iOS
Clip daily · One per reader · Redeemable forever