Bitcoin holders are facing a potential security risk as a planned fork tied to the controversial BIP-110 proposal could lead to a replay attack, allowing malicious actors to steal real Bitcoin. The fork, which may occur in the next few days, creates duplicate balances on two chains, tempting holders to sell the new coins for what appears to be free money. However, this seemingly lucrative deal could result in a replay attack, where a transaction signed to send the forked coins can also be broadcast on the main chain, effectively stealing the seller's Bitcoin. The issue stems from the lack of built-in replay protection until early September, and the initial acceptance of identical transactions by both chains. Bitcoin developer Kevin Loaec warns that large holders could be targeted first, and doing nothing will be a safer option. The replay attack is made possible by the BIP-110 proposal, which aims to keep non-payment data out of Bitcoin transactions for a year. This proposal requires miners to agree and mark the blocks they produce, but the actual restrictions on transaction data do not take effect until September. In the meantime, holders must deliberately create coins that exist on only one branch before spending safely. The fork's potential impact on Bitcoin's security and the actions of its holders raise important questions about the future of the cryptocurrency and the need for robust security measures.
