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How to Use Tor with Eclair

Installing Tor on your node

Linux:

sudo apt install tor

Mac OS X:

brew install tor

Windows:

Download the "Expert Bundle" from Tor's website and extract it to C:\tor.

Configuring Tor

Linux and Max OS X:

Eclair requires safe cookie authentication as well as SOCKS5 and control connections to be enabled.

Edit Tor configuration file /etc/tor/torrc (Linux) or /usr/local/etc/tor/torrc (Mac OS X).

SOCKSPort 9050
ControlPort 9051
CookieAuthentication 1
ExitPolicy reject *:* # don't change this unless you really know what you are doing

Make sure eclair is allowed to read Tor's cookie file (typically /var/run/tor/control.authcookie).

Windows:

On Windows it is easier to use the password authentication mechanism.

First pick a password and hash it with this command:

$ cd c:\tor\Tor
$ tor --hash-password this-is-an-example-password-change-it
16:94A50709CAA98333602756426F43E6AC6760B9ADEF217F58219E639E5A

Create a Tor configuration file (C:\tor\Conf\torrc), edit it and replace the value for HashedControlPassword with the result of the command above.

SOCKSPort 9050
ControlPort 9051
HashedControlPassword 16:--REPLACE--THIS--WITH--THE--HASH--OF--YOUR--PASSWORD--
ExitPolicy reject *:* # don't change this unless you really know what you are doing

Start Tor

Linux:

sudo systemctl start tor

Mac OS X:

brew services start tor

Windows:

Open a CMD with administrator access

cd c:\tor\Tor
tor --service install -options -f c:\tor\Conf\torrc

Configure Tor hidden service

To create a Tor hidden service endpoint simply set the eclair.tor.enabled parameter in eclair.conf to true.

eclair.tor.enabled = true

Eclair will automatically set up a hidden service endpoint and add its onion address to the server.public-ips list. You can see what onion address is assigned using eclair-cli:

eclair-cli getinfo

Eclair saves the Tor endpoint's private key in ~/.qtum-eclair/tor_pk, so that it can recreate the endpoint address after restart. If you remove the private key eclair will regenerate the endpoint address.

There are two possible values for protocol-version:

eclair.tor.protocol-version = "v3"
value description
v2 set up a Tor hidden service version 2 end point
v3 set up a Tor hidden service version 3 end point (default)

Tor protocol v3 (supported by Tor version 0.3.3.6 and higher) is backwards compatible and supports both v2 and v3 addresses.

For increased privacy do not advertise your IP address in the server.public-ips list, and set your binding IP to localhost:

eclair.server.binding-ip = "127.0.0.1"

Configure SOCKS5 proxy

By default all incoming connections will be established via Tor network, but all outgoing will be created via the clearnet. To route them through Tor you can use Tor's SOCKS5 proxy. Add this line in your eclair.conf:

eclair.socks5.enabled = true

You can use SOCKS5 proxy only for specific types of addresses. Use eclair.socks5.use-for-ipv4, eclair.socks5.use-for-ipv6 or eclair.socks5.use-for-tor for fine tuning.

To create a new Tor circuit for every connection, use randomize-credentials parameter:

eclair.socks5.randomize-credentials = true

⚠️ Tor hidden service and SOCKS5 are independent options. You can use just one of them, but if you want to get the most privacy features from using Tor use both.

Note, that bitcoind should be configured to use Tor as well (https://en.bitcoin.it/wiki/Setting_up_a_Tor_hidden_service).