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A migration flaw affecting older wallet setups can wipe local wallet files under specific conditions, prompting developers to pull recent releases.Bitcoin Core developers warned users on Monday of a wallet migration bug in versions 30.
0 and 30.1 that can delete files and result in fund loss.Lacie Zhang, market analyst at Bitget Wallet, told Cointelegraph that the bug is triggered when the software attempts to migrate an unnamed legacy “wallet.dat” file stored in a custom wallet directory, often defined using “-walletdir” setting, while pruning is enabled. In these cases, the migration can appear to complete successfully, but the cleanup logic mistakenly deletes the entire wallet directory, and if a user does not have an external backup, “loss of access to funds is effectively guaranteed because all local wallet files are removed.” Shawn Odonaghue, community lead at layer-3 blockchain Orbs, told Cointelegraph that the bug primarily impacts “very old wallet setups,” and that users with adisclosedThe project told users not to use the wallet‑migration tools until a fixed release, Bitcoin Core 30.2, is available, stressing that existing users who are not attempting migrations can continue running their nodes as normal. Zhang added that technically proficient users can assess their exposure by checking whether they are running Bitcoin Core v30.0 or v30.1, determining whether their wallet is a legacy wallet, inspecting “debug.log” to see whether pruning is enabled and whether any migration attempts have already occurred, and by reviewing the directory layout to confirm whether “-walletdir” points to a custom or mounted location. “Risk is highest if all these conditions are present and a migration has either been attempted or is pending,” she said. “If no migration has occurred yet, users should immediately back up the entire data directory to external media and avoid restarting or upgrading until moving to version 30.2 or later.”Coin Dance, Bitcoin Core currently accounts for about 78% of reachable Bitcoin nodes, while other implementations such as Bitcoin Knots make up almost 22%.“The bigger takeaway is concentration risk,” Odonaghue said. “Bitcoin Core has a massive share of the ecosystem, there aren’t many truly mainstream alternatives… when one implementation becomes the default, any bug or design decision has outsized impact.” Zhang added that while the bug was not “consensus-critical,” its impact shows how wallet-layer issues can still scale into ecosystem-wide problems when a single implementation dominates usage.
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