Many Bitcoin wallets vulnerable to double-spending of confirmed transactions
This seems to be further confirmation that the ONLY safe way to use bitcoin is to use a full blockchain wallet such as Bitcoin Core. Any software which attempts to 'fake' it by not keeping the full blockchain has issues, exactly like this one being announced today.<p>This is a serious problem for Bitcoin, because right now it takes 2-3 <i>days</i> to download and verify the full block chain, and is fast approaching 10^H^H40 gigabytes in size.<p>There's going to need to be some sort of mitigation for this at some point but I don't see how that's possible.