04 Jul '15, 7am

Many Bitcoin wallets vulnerable to double-spending of confirmed transactions

Some Miners Generating Invalid Blocks 4 July 2015 This document is being updated as new information arrives. Last update: 2015-07-04 16:00 UTC Summary Your bitcoins are safe if you received them in transactions confirmed before 2015-07-04 15:00 UTC. However, there has been a problem with a planned upgrade. For bitcoins received later than the time above, confirmation scores are significantly less reliable then they usually are for users of certain software: Lightweight (SPV ) wallet users should wait an additional 30 confirmations more than you would normally wait. Bitcoin Core 0.9.4 or earlier users should wait an additional 30 confirmations more than you would normally wait or upgrade to Bitcoin Core 0.10.2 . Web wallet users should wait an additional 30 confirmations more than you would normally wait, unless you know for sure that your wallet is secured by Bitcoin Core ...

Full article: https://bitcoin.org/en/alert/2015-07-04-spv-mining

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