Qrypto

A post-quantum
wallet.

AI is accelerating the discovery of cryptographic weaknesses. Nothing widely deployed is broken today, but the time to prepare may be now.

Checking release status…

Read the history: why the prepared beat the surprised

Editorial still life: a dark folded document closed with two distinct wax seals, one crimson and one bone.

Qrypto comes with quantum-proofing out of the box.

Diagram: a gray Standard key and a green Quantum-encrypted key merge directly into one transaction card labeled TX SIGNED.

Every Qrypto operation is one hash approved twice: once with a regular ECDSA key, once with a post-quantum SPHINCS-C13 key. The smart account executes only after both signatures verify onchain; either failing rejects the operation.

About 307k UserOperation gas in this measured Sepolia run (307,288 used, 399,605 pre-estimated, 300,559 in the outer transaction). Fees vary by network and conditions.

C13 is an experimental SPHINCS-derived construction, not NIST's standardized SLH-DSA, and Qrypto is unaffiliated with the SPHINCS+ team. Inspect the rule yourself: the proof on Sepolia and the Mainnet beta canary.

Two keys, both required, one transaction.

Once setup is complete, Qrypto works like a compact Ethereum wallet. Pick a network, see the balance, connect to a site, and approve from one place.

Install Qrypto and create yours

The configured Qrypto extension on Ethereum, showing the wallet address, balance, connection action, and technical details.

Install the preview.

Download it, load it, and open Qrypto. Everything needed to create and use the wallet is inside the extension.

  1. Download and extract

    Extract the ZIP to a folder you keep: your browser loads Qrypto from it, and INSTALL.md inside covers the details.

  2. Load unpacked

    On your browser's extensions page, enable Developer mode, click Load unpacked, and choose that folder.

  3. Open Qrypto

    Open Qrypto from the toolbar and choose Create wallet. It creates both independent keys and signs inside the extension.

Reading ./release.json…

Browser addresses & the Firefox note

Browser settings pages cannot be opened by a website; copy the address for your browser and paste it into the address bar. This Chromium ZIP is not a Firefox XPI. Firefox self-distribution requires a separately compatible, Mozilla-signed XPI.

  • Chromechrome://extensions
  • Bravebrave://extensions
  • Edgeedge://extensions

Chrome: load an unpacked extension Brave: Chromium extensions Edge: sideload an extension

Release manifest, checksum & updates
Status
checking…

Read from ./release.json. Verify the ZIP yourself: shasum -a 256 qrypto-quantum-wallet.zip must match the checksum above.

From v0.1.2, Qrypto shows a New update banner when a newer publisher-signed ZIP is published, and verifies its signed size and SHA-256 before saving. Extract it over the same folder and click Reload on your extensions page; unpacked extensions never install code silently.

Research preview. Qrypto is unaudited; on Ethereum, start with a small amount you can afford to lose. Keep both recovery files private and separate.