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@ ⚡️2FakTor⚡️
2025-01-21 17:02:21
The past 26 August, Tor [introduced officially](https://blog.torproject.org/introducing-proof-of-work-defense-for-onion-services/) a proof-of-work (PoW) defense for onion services designed to prioritize verified network traffic as a deterrent against denial of service (DoS) attacks.
~ > This feature at the moment, is [deactivate by default](https://gitlab.torproject.org/tpo/core/tor/-/blob/main/doc/man/tor.1.txt#L3117), so you need to follow these steps to activate this on a MiniBolt node:
* Make sure you have the latest version of Tor installed, at the time of writing this post, which is v0.4.8.6. Check your current version by typing
```
tor --version
```
**Example** of expected output:
```
Tor version 0.4.8.6.
This build of Tor is covered by the GNU General Public License (https://www.gnu.org/licenses/gpl-3.0.en.html)
Tor is running on Linux with Libevent 2.1.12-stable, OpenSSL 3.0.9, Zlib 1.2.13, Liblzma 5.4.1, Libzstd N/A and Glibc 2.36 as libc.
Tor compiled with GCC version 12.2.0
```
~ > If you have v0.4.8.X, you are **OK**, if not, type `sudo apt update && sudo apt upgrade` and confirm to update.
* Basic PoW support can be checked by running this command:
```
tor --list-modules
```
Expected output:
```
relay: yes
dirauth: yes
dircache: yes
pow: **yes**
```
~ > If you have `pow: yes`, you are **OK**
* Now go to the torrc file of your MiniBolt and add the parameter to enable PoW for each hidden service added
```
sudo nano /etc/tor/torrc
```
Example:
```
# Hidden Service BTC RPC Explorer
HiddenServiceDir /var/lib/tor/hidden_service_btcrpcexplorer/
HiddenServiceVersion 3
HiddenServicePoWDefensesEnabled 1
HiddenServicePort 80 127.0.0.1:3002
```
~ > Bitcoin Core and LND use the Tor control port to automatically create the hidden service, requiring no action from the user. We have submitted a feature request in the official GitHub repositories to explore the need for the integration of Tor's PoW defense into the automatic creation process of the hidden service. You can follow them at the following links:
* Bitcoin Core: https://github.com/lightningnetwork/lnd/issues/8002
* LND: https://github.com/bitcoin/bitcoin/issues/28499
---
More info:
* https://blog.torproject.org/introducing-proof-of-work-defense-for-onion-services/
* https://gitlab.torproject.org/tpo/onion-services/onion-support/-/wikis/Documentation/PoW-FAQ
---
Enjoy it MiniBolter! 💙