US lawmakers are considering a proposal to limit de minimis tax exemptions exclusively to stablecoins, potentially subjecting Bitcoin transactions to capital gains tax. The proposed legislation, introduced by Wyoming Senator Cynthia Lummis, would cap tax-free cryptocurrency sales at $5,000 annually, explicitly excluding Bitcoin from these exemptions. This move could significantly impact Bitcoin's viability as a daily transactional currency. Critics, including the Bitcoin Policy Institute, have expressed concerns, labeling the exclusion of Bitcoin as a 'severe mistake.' The proposal's timing is particularly notable as it coincides with ongoing discussions about the approval of a Bitcoin ETF, raising questions about its potential implications on the cryptocurrency market.