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Universe Wallet

A wallet you can read before you sign it

Universe Wallet is a self-custody browser extension for Bitcoin, Dogecoin, Zcash, and Fractal Bitcoin. It keeps coins that carry digital artifacts out of ordinary payments, and it puts a plain-language account of what you are about to authorize in front of every signature.

Start hereWhich version you are runningSafety

Read this before you trust anything else on this site

The build published on the Chrome Web Store is 1.0.13, from 15 April 2025. This documentation is written against the 1.7.5.8 source tree, which has not been submitted or published. If you installed from the store, you are running the older build, and screens described here may not exist in it.

In 1.7.5.8 as committed, 0 of 42 protocols authorize any operation. Nothing on this site should be read as a promise that a protocol action will work in your build. The screen in your own wallet is the answer.

The full version and release position

Lifecycle
Experimental
Documented version
1.7.5.8
Published version
1.0.13
Chains
Bitcoin, Dogecoin, Zcash, Fractal
Custody
Yours alone

What this documentation is for

Section titled “What this documentation is for”

You are holding your own keys. That means no company can move your money, and equally that no company can give it back. Every page here is written so that believing it cannot cost you anything: where a capability could not be verified in the wallet’s source, this site says it is not available rather than describing how it might work.

  • Install and set up

    Which browsers work, where the real extension lives, and how to create or import a wallet without losing it a week later.

  • What a signature authorizes

    The single most valuable page here. Four kinds of approval, and the exact boundary of each one.

  • Protected outputs

    Why some of your balance will not spend, and why that is the feature rather than the fault.

  • Review before you sign

    How to read the approval screen top to bottom, and which line to check when you are in a hurry.

  • Backup and recovery

    Which loss your recovery phrase covers, which it does not, and the one situation with no way back.

  • If something is wrong

    What to do first when you think your phrase was seen, a signature went wrong, or coins moved without you.

Where things live

Section titled “Where things live”

  • Supported features

    What is present, what is behind a release gate, and what does not exist at all.

  • Protocol registry

    All 42 protocols, their chains, their intended operations, and their authorization state.

  • Known limitations

    Every limit we can state plainly, including the ones that are inconvenient to admit.

  • Provider API

    For application developers integrating a connect and sign flow with the extension.

  • Troubleshooting

    The failures people actually hit, and what each one means about your funds.

  • Support and security reporting

    Where to ask, where to report a vulnerability, and what nobody will ever ask you for.

Section titled “Related”