qUSB is the first full self-custody cold wallet for your $SOL that you can make from any USB stick, and it's quantum-proof
No chip, no vendor. It signs with hashes instead of curves, and an open-source Solana program checks every signature on-chain
$qUSB fees pay the dev to build it
qusb.app
$qUSB
CA: 9NDY4jY5gqcNfDrZsKujtnuvH12pPG5FUGS5QmwZpump
@solana @toly @solana_devs
quick note for anyone here for the pump:
I don't launch often, only when I've got something worth building, last time was $SAM, ot hit almost $4M at its peak, and I worked on it nonstop for 3–4 months with no supply, just the creator fees
I'm saying this for those of you who care about the token more than the tech, that's fine, because there's no tech without the token
the token makes the fees, and the fees pay for me to build, simple as that
$qUSB 9NDY4jY5gqcNfDrZsKujtnuvH12pPG5FUGS5QmwZpump
I built a cold wallet you can make out of any USB stick. It's called qUSB, and it's quantum-proof
qusb.app
$qUSB
here's the problem in plain words
every Solana wallet today is protected by the same kind of math: elliptic curves, that includes Phantom, Backpack, your Ledger, all of them, y our public address is out in the open, and right now nobody can work backwards from it to your private key, normal computers would need longer than the universe has existed
big enough quantum computer changes that
there's a known algorithm, Shor's, that does exactly this: public key in, private key out, obody can tell you the date that machine shows up, ut when it does, every wallet built on curves is open, and moving your coins after the fact won't help if someone gets there first
so I built a wallet that doesn't use curves at all
qUSB signs with hashes instead, using Winternitz one-time signatures over SHA-256, hash-based signatures are the boring, well-understood kind of post-quantum crypto
quantum computer has no shortcut against them, with no curve, there's nothing for Shor to break
how it works:
1. take any USB stick from your drawer. No special hardware, no chip, no company
2. flash it with qUSB. It holds an encrypted keystore and the wallet program
3. run qusb init. You get 24 words and set a passphrase, and your keys are encrypted on the stick
4. qusb receive gives you a vault address. Send SOL to it from any wallet or exchange
5. to spend, you sign offline with the stick, then broadcast from any online computer, signed message is locked to one recipient and one amount, so the online machine can't redirect your funds
the vaults live on Solana, small open-source program called qvault checks the hash-based signature on-chain before any SOL moves, there's no admin key and no backdoor over your funds
lose the stick? everything comes back from your 24 words, someone steals the stick? without your passphrase they get encrypted noise
What it doesn't do (I'd rather you hear it from me):
- It's v1 and not audited yet
- each vault key signs exactly once, wallet handles this and moves your change to the next vault
- Fees and SPL tokens still use a normal Solana key, as every wallet today, keep only fee money there
- If the computer you sign on has malware, it can see your keys while you sign, use a machine you trust
the full threat model is in the repo
why a token?
I want qUSB to be the first serious open-source software with no financial dependency on anyone, no VC, no sales team, no paid marketing
$qUSB is how it gets funded: the creator fees pay me and it
that's it, he token gives no claim on anything, and the code stays open source whatever happens
If you've used SAM, you know I ship open source. This is the next one
code: github.com/prfagit/qusb
qvault program: CnfS7soDNtZaJgshcU38tvDuK2zZZwFPAedRUdRm
read the code, plug it in
CA: 9NDY4jY5gqcNfDrZsKujtnuvH12pPG5FUGS5QmwZpump
I need to tell you what actually happened with hoodscout.
I built a tool that watched every token launch on robinhood chain and read the wallets behind it, live. bundles, funding clusters, fake crowds.
day one it caught a token seeding 199 holders from one wallet in one transaction. six times in an hour. the tool worked.
here's the part I didn't say.
the token the tool ran on was bundled too. by me. on purpose.
the cluster sat on every bubble map from minute one. red circles, connected wallets, the exact pattern the tool was built to expose. top 10 held 26 percent.
206 people bought it.
not one person mentioned the map.
I sold a microscope to a crowd and pointed it at the crime. nobody looked through it.
the bundle was closed after, for nothing. no profit. that was never the point. the point was the question.
does anyone actually check?
no. nobody checks. narrative beats diligence every single time. attention is the only diligence left.
I ran seven launches to learn this. real tools, real products, real rooms. the best product died in 18 hours, same as the worst one. the chart never once cared what was real.
so I stopped fighting the finding. now I build on it.
in the old paris theaters there was a profession. organized applause. people paid to clap, planted through the crowd. the crowd always joined, and the show became a hit, and nobody in the seats ever knew the first pair of hands was hired.
they were called the claque.
the theaters are gone. the profession never left.









