Bitcoin Core Developers Find Privacy Bug That Can Leak User IP Addresses
Bitcoin Core builders have disclosed a privateness bug that may expose the very element it was designed to cover, a consumer’s IP handle. A repair will arrive in model 31.1.
The flaw sits in non-public broadcast, an optionally available characteristic added in model 31.0 this April. Developers revealed the warning on June 6.
How the Privacy Bug Backfires
Private broadcast sends transactions via Tor, an anonymity community well-known for accessing the darkish net, so recipients by no means be taught the place they originated.
However, the official advisory admits this promise can break.
The hassle begins when the software program makes an attempt an encrypted connection to a different laptop on the community. If that try fails, it quietly retries over a traditional connection and skips Tor solely. The recipient then sees the sender’s actual IP handle, and with it their approximate location.
Worse, attackers don’t want luck. A hostile node can intentionally reject the encrypted handshake and pressure the revealing retry.
The threat is important as a result of Bitcoin’s ledger is public. Linking a transaction to an IP handle can tie funds to an actual particular person.
Who is Affected and What to Do
The bug solely touches individuals who run model 31.0 and switched the characteristic on. Everyday pockets transactions stay unaffected. Developers credit score researcher Eugene Siegel with the invention.
Meanwhile, markets barely flinched. Bitcoin (BTC) trades near $63,700, little modified over the previous day. Developers now face the quieter job of repairing belief in Bitcoin privacy efforts.
Until model 31.1 ships, affected customers ought to disable the characteristic or route all their visitors via Tor. The episode follows a current transaction relay dispute and revives questions on who maintains Bitcoin Core.
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