Photos: Inside one of the world’s largest bitcoin mines
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This document is being updated as new information arrives. All times are UTC. Users of the affected wallets listed below are still advised to wait additional confirmations or to switch to a safer wallet. Your bitcoins are safe if you received them in transactions confirmed before 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:.
If you pool mine, please switch to a pool that properly validates blocks. The Wiki Mining Pool Comparison page currently contains a list of known or suspected good and bad pools. The problem is miners creating invalid blocks. Some miners are currently generating invalid blocks. Almost all software besides Bitcoin Core 0.
Bitcoin 2015 mining several months, an increasing amount of mining hash rate has been signaling its intent to begin enforcing Bitcoin 2015 mining strict DER signatures. As part of the BIP66 rules, once of the last 1, blocks were version 3 v3 blocks, all upgraded miners would reject version 2 v2 blocks.
Unfortunately, it turned out that roughly half the network hash rate was bitcoin 2015 mining without fully validating blocks called SPV miningand built new blocks on top of that invalid block. The recommended fix, which was attempted, was to get all miners off of SPV mining and back to full validation at least temporarily. If this happens, Bitcoin. Please see the list of invalid block hashes on the Bitcoin Wiki. Summary Your bitcoins are safe if you received them in transactions confirmed before 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 bitcoin 2015 mining an additional 30 confirmations more than you would normally wait.
Electrum users, please see this note. 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 0. Miners If you pool mine, please switch to a pool that properly validates blocks.
If you solo mine, please switch to Bitcoin Core 0. Upgrade is recommended to return to full node security. Lightweight SPV wallets are not safe for less than 30 confirmations until all the major pools switch to full validation. Web bitcoin 2015 mining are very diverse in bitcoin 2015 mining infrastructure they run and how they handle double spends, so unless you know for sure that they use Bitcoin Core 0.
So far, the following forks of two or more blocks have occurred: Updates 6 July A new fork occurred starting 5 July at See the recently-added list of forks. Reports that the situation has passed are not correct. Please bitcoin 2015 mining to wait 30 more confirmations than you usually would wait before accepting a transaction.
Invalid Blocks Please see the list of invalid block hashes on the Bitcoin Wiki.
