Since the recent evil nodes attack and the consequent release of Monero 0.17, we started seeing some users getting corrupted wallet files. On very strange, unusual conditions (since Monerujo is such a perfectly coded piece of software) it may happen that you encounter a message such as this when you try to open one of your wallets:
Connection to node failed! — check username/password

It has nothing to do with the connection, nor with your username or password. We have a hunch it’s related to some nodes providing contradictory information, which when incorporated to the wallet files on your phone…

From time to time, we have the annoying pleasure of upgrading to a new phone. A clean slate of tidy home screen with a minimal arrangement of icons waiting for our virtual boxes with all the junk we carry from the last phone. But even if we migrate everything as it is, with the help of an assitant even, there’s one very special thing we have to take care of moving on our own: your Monerujo monero wallets.

Here’s a detailed article about Monerujo’s security scheme with encryption and CrAzYpasses you don’t need to read for this procedure, but would…

First and foremost, I’m not going to tell you which wallet to choose. Of course you can choose whatever wallet you want, they’re your hard earned moneroj after all, be your own bank, etc. But if you are kinda lost with the decision let’s take a look at the types of wallets out there, how they work, and more important: what does that choice mean to you from a security and privacy standpoint.

First, we need some very basic understanding of how Monero works

  • Monero has a distributed book or ledger where all the transactions are recorded. …

The latest version of Monerujo (v1.10.x) introduces a long awaited reworked nodes management screen, and rethinks how decentralized nodes could be married with an elegant enough UX. First, let’s have a quick look at what nodes are.

What are nodes?

The Monero network is a web of computers connected to each other. It looks something like this:

Each dot is a computer running Monero node software

Each of these computers is a node. They communicate with each other so everybody keeps a decentralized copy of the ledger, and maintain consensus about who has how much. To be a proper, working node, it needs:

  1. To be running the Monero node program (to know…

There are several different scenarios that might bring you to having to move your current wallet (or wallets) from one Monerujo app to another. Whether you lost your phone, or it got stolen, or you drop it on a boating accident, or you simply bought a newer, shinier one, we’ll take a look at how you can restore your existing wallet according to different scenarios, from the worst to the best:

If you don’t have anything

Well… you’re screwed. You should have written down your mnemonic seed and stored it in a safe and private place. As Andreas Antonopoulos famously said: “Your keys, your bitcoin…

Since version 1.7.3 Monerujo supports OpenAlias. I’ll do a brief explanation of what it does and why it’s both awesome and needed, how it works on the Monerujo wallet, and how you can get your own, if you can (I’ll explain).

What is it?

OpenAlias is a nice standard that lets you setup an alias for your cryptocurrency address. The ability to use alias is huge for ease of use (and let’s hope also adoption) of technologies. When you type google.com on your browser, you’re not really going to google.com just like that (even though it appears so). …

For the rejoice of Monero users everywhere, since version 1.6.1 Monerujo features integration with the Ledger Nano S. This guide should help you set it up and use it. This enables you to tie together the convenience of Monerujo with the security of a hardware wallet, for a best-of-both-worlds super duper private crypto combo.

Setting up your wallet for the first time

Ok basics first: you’ll need an android phone with Monerujo installed, a Ledger Nano S with the Monero app installed, and an OTG cable to connect both.

You may need to enable OTG on your phone (I needed in mine) for it to work. Go to…

In case you didn’t know, since version 1.5.9 Monerujo supports two of the latest Monero features: accounts and subaddresses. This opens a lot of possible ways to organize and optimize your Monero usage, but as with life itself, too many choices can overwhelm you. Fear not, I’ll go into each of them and explain what they are and how they work.

Accounts

Until now, you only had one public address per wallet, and funds received on it showed up on the wallet’s only balance after syncing with the blockchain.

That means that you had to create as many wallets as different…

Mandatory disclaimer: I’m a member of the Monerujo team, albeit the less code-savvy one, but it puts me in an interesting position, if I can understand this, so do almost anyone. This article is intended to explain why CrAzYpass is implemented and the logic behind what it does, and even work a bit as a FAQ. For a proper explanation of how it actually works, please read the whitepaper.

Context

Monerujo is the first mobile wallet for Monero. It allows you to receive, store and send Monero from your android phone. Therefore it needs to check that is you (and not…

Andrés

Co-Founder at Sloop + Monerujo team member

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