📅 Original date posted:2015-08-18
📝 Original message:Bitcoin XT contains an unmentioned addition which periodically downloads
lists of Tor IP addresses for blacklisting, this has considerable privacy
implications for hapless users which are being prompted to use the
software. The feature is not clearly described, is enabled by default,
and has a switch name which intentionally downplays what it is doing
(disableipprio). Furthermore these claimed anti-DoS measures are
trivially bypassed and so offer absolutely no protection whatsoever.
Connections are made over clearnet even when using a proxy or
onlynet=tor, which leaks connections on the P2P network with the real
location of the node. Knowledge of this traffic along with uptime metrics
from bitnodes.io can allow observers to easily correlate the location and
identity of persons running Bitcoin nodes. Denial of service can also be
used to crash and force a restart of an interesting node, which will
cause them to make a new request to the blacklist endpoint via the
clearnet on relaunch at the same time their P2P connections are made
through a proxy. Requests to the blacklisting URL also use a custom
Bitcoin XT user agent which makes users distinct from other internet
traffic if you have access to the endpoints logs.
https://github.com/bitcoinxt/bitcoinxt/commit/73c9efe74c5cc8faea9c2b2c785a2f5b68aa4c23
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F L [ARCHIVE] /
npub1ag…k2vrn
2023-06-07 15:48:19
in reply to nevent1q…q9d9
Author Public Key
npub1agfpqx20p62n3la5wxkmagpngh7arzn8x84995ugwg42d598dg5s3k2vrnPublished at
2023-06-07 15:48:19Event JSON
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"created_at": 1686152899,
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"content": "📅 Original date posted:2015-08-18\n📝 Original message:Bitcoin XT contains an unmentioned addition which periodically downloads\nlists of Tor IP addresses for blacklisting, this has considerable privacy\nimplications for hapless users which are being prompted to use the\nsoftware. The feature is not clearly described, is enabled by default,\nand has a switch name which intentionally downplays what it is doing\n(disableipprio). Furthermore these claimed anti-DoS measures are\ntrivially bypassed and so offer absolutely no protection whatsoever.\n\nConnections are made over clearnet even when using a proxy or\nonlynet=tor, which leaks connections on the P2P network with the real\nlocation of the node. Knowledge of this traffic along with uptime metrics\nfrom bitnodes.io can allow observers to easily correlate the location and\nidentity of persons running Bitcoin nodes. Denial of service can also be\nused to crash and force a restart of an interesting node, which will\ncause them to make a new request to the blacklist endpoint via the\nclearnet on relaunch at the same time their P2P connections are made\nthrough a proxy. Requests to the blacklisting URL also use a custom\nBitcoin XT user agent which makes users distinct from other internet\ntraffic if you have access to the endpoints logs.\n\n\nhttps://github.com/bitcoinxt/bitcoinxt/commit/73c9efe74c5cc8faea9c2b2c785a2f5b68aa4c23\n\n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20150819/93ca00ed/attachment-0001.html\u003e",
"sig": "3836164e14bcafdf2452272aaef6c6d5c81581bad24486bf3772ebe920c264e6349daae20e2220f3596266e6aba882131ca59d2750a936fe0edd6a66f990b380"
}