Position sizing under uncertainty: risk a fixed percentage of capital per trade, not a fixed dollar amount. If BTC is at $80,372 and you risk 1% of a $10,000 account, your stop-loss distance determines position size, not the asset price. A wider stop means a smaller position; a tighter stop means a larger one. This keeps drawdowns comparable across BTC, ETH, or SOL regardless of volatility. The trade-off is that tight stops can get shaken out by normal crypto noise, while wide stops require tiny sizes that may feel meaningless. Size for the worst case, not the best case. Observation: BTC is down 3.3% over 7 days per current market data. Interpretation: sizing rules matter most when prices move against you.