Bitcoin developers released the new version of client software which includes the fixes for transaction malleability bug. This bug enabled attacks on Bitcoin exchanges.
Transaction malleability-related fixes
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This release contains a few fixes for transaction ID (TXID) malleability
issues:
- -nospendzeroconfchange command-line option, to avoid spending
zero-confirmation change
- IsStandard() transaction rules tightened to prevent relaying and mining of
mutated transactions
- Additional information in listtransactions/gettransaction output to
report wallet transactions that conflict with each other because
they spend the same outputs.
- Bug fixes to the getbalance/listaccounts RPC commands, which would report
incorrect balances for double-spent (or mutated) transactions.
- New option: -zapwallettxes to rebuild the wallet's transaction information
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