Eclair Wallet is now Eclair Mobile

Jan 4, 2019 · 4 min read

TL; DR: Eclair Wallet is now Eclair Mobile, with background routing sync and custom Electrum server support. Reception of funds over Lightning will be enabled in 2019.

Image for post
Image for post

We decided to rename Eclair Wallet to Eclair Mobile because the former name was too generic and regularly caused confusion among our users. Hopefully it will be clearer now:

  • Eclair is a full LN node implementation, it is intended to run on a desktop or server. It is the software that powers the ACINQ node, one of the oldest, most reliable and most connected nodes in the network.
  • Eclair Mobile is a Bitcoin & Lightning mobile wallet for Android.

Here are a few things you should know about Eclair Mobile.

Eclair Mobile is a Lightning node

It runs an actual stripped-down Lightning node on your smartphone, which is derived from and shares ~90% of the code of Eclair. It is not a remote control to some Lightning node or API hosted by us: your funds stay on your device.

Note that Eclair Mobile only opens private/unannounced LN channels, that’s why your node and your channels won’t appear on any explorers.

Eclair Mobile relies on Electrum servers for accessing the Bitcoin blockchain. Until now it connected to a set of predefined servers, but latest version support selecting a custom Electrum server of your choice. This way you can point to your own Electrum server and not trust anyone. Note that when using that feature, Eclair Mobile will always use SSL and expects a valid certificate.

Eclair Mobile is also a regular off-chain Bitcoin wallet

You can perfectly use Eclair Mobile as a simple, segwit-ready Bitcoin Wallet without even using Lightning. Most of the features commonly found in a Bitcoin wallet are supported.

It is particularly easy to select the right fee when sending an on-chain payment: you can choose a precomputed fast/medium/slow fee or set a custom one, and we will soon add replace-by-fee support, to allow you to easily modify the fee of an unconfirmed transaction. This gives you full control, and it will be useful in the future when fees rise again (they will!).

Eclair Mobile computes payment routes on-device

It is well known that LN preserves the trustless and censorship resistant properties of Bitcoin, and even adds significant privacy guarantees on top of it. But most of these are lost if you delegate the route calculation to a third party: it defeats the purpose of onion routing and make your payments trivially censorable.

That’s why we have put a lot of effort into optimizing the way routing table is synced in the LN protocol, to ensure that lighter nodes don’t get left behind as the network grows and bring the full benefit of LN to our users.

With the latest release, Eclair Mobile now has a low footprint background sync mechanism for its routing table. This means that when you start the wallet, it will be immediately ready to use.

And now for the most awaited question…

When will you enable receiving LN payments?

You may know that Eclair Mobile currently only allows sending money over Lightning, not receiving. We made this choice for several reasons:

  • For mobile users, the #1 use case for Lightning is to send payments. Being able to do with Bitcoin what you would do with your credit card is already a great achievement ;
  • It is far safer, because it saves us from monitoring the blockchain, which is difficult to do reliably, especially on mobile devices. In fact, you can turn off your phone for an unlimited period of time, even with funds in open channels and you will be perfectly safe ;
  • Inbound liquidity is necessary to receive funds, it is tricky to explain, and the protocol was missing some crucial parts to make it seamless for inexperienced users. By going too fast too early, we would have spent a considerable amount of time providing support to users who couldn’t receive money right after having opened a channel (while all the money is on their side). Dual funding and liquidity advertisement (discussed during the Lightning Summit last Nov and scheduled for LN 1.1) will finally bring the tools allowing us to address this at scale and in a reasonably user-friendly way.

In short, only allowing sending money was the safest choice, while bringing most of the benefits that LN could offer during its first year on mainnet. We believe that the upcoming evolutions of the protocol will allow us to enable receive-over-LN in Eclair Mobile in 2019.

Finally, developing a mobile Lightning wallet is no easy task, and it is very rewarding to receive feedback from our users from all over the world, in Switzerland, Brazil, Australia, Germany, China… Thank you all and a Happy New Year!

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch
Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore
Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store