A recent two-block reorganization on the Bitcoin network has highlighted potential vulnerabilities in the long-standing six-confirmation rule. On March 23, Foundry mined six consecutive blocks, while AntPool and ViaBTC briefly extended a competing branch. The network resolved the fork by following the chain with the most hash rate, demonstrating Bitcoin's design in action. The six-confirmation rule, originating from Satoshi Nakamoto's 2008 whitepaper, assumes an attacker controls about 10% of the network's hashpower. However, with Foundry recently holding 32.2% of the global hashrate, the risk of transaction reversal after six confirmations has increased to 18.9%. This concentration of mining power challenges the traditional assumption of transaction finality, prompting exchanges like Coinbase, Kraken, and Gemini to adopt lower confirmation thresholds for BTC deposits. As mining economics tighten and pool concentration remains high, the six-confirmation rule's reliability is under scrutiny. The industry may need to adjust confirmation requirements based on transaction value and network conditions, moving away from the universal application of the six-confirmation standard.