tx-tor-broadcaster

CLI utility that broadcasts BTC, ETH, SOL, ZEC & XMR transactions through TOR using public block explorers.

Provides a great degree of anonymity for your transactions.

Ensures no traffic is passed outside TOR, including DNS requests. Uses one small dependency which provides list of popular user agents. See fingerprinting section for additional information.

Check out all web3 utility libraries:

Usage

npm install -g tx-tor-broadcaster

The command line interface is simple: call txtor <NET> <TX> command through terminal.

You must have Tor or Tor Browser up & running.

You can specify a few options via env variables, if needed:

  • TOR_HOST=192.168.2.5 txtor zec <tx>; default is 127.0.0.1
  • TOR_SOCKS_PORT=9051 txtor bch <tx>; default is 9050 (9150 should be used for Tor Browser)
  • TOR_RETRY_LIMIT=2 txtor sol <tx>; default is 10

txtor
# Usage: txtor <NET> <TX>
# NET: btc, eth, sol, zec, xmr, bch

txtor btc 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
txtor eth 0xf86c0a8502540be400825208944bbeeb066ed09b7aed07bf39eee0460dfa261520880de0b6b3a7640000801ca0f3ae52c1ef3300f44df0bcfd1341c232ed6134672b16e35699ae3f5fe2493379a023d23d2955a239dd6f61c4e8b2678d174356ff424eac53da53e17706c43ef871
txtor sol 4vC38p4bz7XyiXrk6HtaooUqwxTWKocf45cstASGtmrD398biNJnmTcUCVEojE7wVQvgdYbjHJqRFZPpzfCQpmUN

Node.js API:

import { Broadcaster } from 'tx-tor-broadcaster';
const br = new Broadcaster(net, tx); // , opts = { socksHost, socksPort, retryLimit }
console.log(`${bold}TOR exit IP:${reset}`, await br.getIP());
const res = await br.broadcast();
if (res) console.log(`${green}${bold}Published${reset} (${res.host}): ${res.txId}`);

Fingerprinting

Fingerprinting is an algorithm that allows to uniquely identify user within the global dataset. For example, if you are using obscure old browser for everything, it’s easy to identify you within millions of users.

The app uses popular user agents (package) to populate User-Agent header. If more than 120 days have passed since the dependency was last updated, the package will stop working.

This mitigates only one variable. There are many others:

  • Headers
    • Accept: e.g. text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    • Accept-Encoding: compression support gzip, deflate, br
    • Accept-Language: OS language
  • TLS/SSL settings; indicating supported…
    • TLS protocols e.g. 1.3, 1.2
    • HTTP versions e.g. HTTP2, HTTP3
    • cipher suites e.g. TLS_AES_256_GCM_SHA384 or TLS_CHACHA20_POLY1305_SHA256
    • named groups e.g. x25519, secp256r1, x448, secp521r1, secp384r1
  • Network/TCP settings, possibly MTU/Nagle algorithm status

It has been decided the best way to go is not copying full browser behavior, but instead, just setting the User-Agent header; to ensure Cloudflare is bypassed properly.

Since there are tens of variables that can affect fingerprint calculation, it’s non-trivial to set all of them properly. Not only that, we’ll need to update the params with every browser update. And we’ll still probably miss some minor detail.

  • Let’s say there are 1000 people who send TX through Tor using popular browser User Agent
  • Out of them, only 100 will set additional headers like Accept-Language. Many of them will send different information in headers; some will support Enconding, some will not
  • So, the more we mimic a particular browser, the more we increase our fingerprinting vector

To view the data you’re leaving, check out httpbin, httpbin ssl, browserleaks and valdikss.

License

MIT License (c) 2022 Paul Miller (https://paulmillr.com)

GitHub

View Github