One call a day, on the coin shown above. Buy commits $500 of the $10,000 starting balance; Sell closes whatever position is open; Hold does neither — a real choice, not a way to skip the day. The call locks in at today’s price and settles at 00:00 UTC against wherever the price actually went.

The streak counts days played, not days won. Buy, Sell or Hold all keep it moving, whether the call turns out right or not — a wrong call just doesn’t move the portfolio. Only a day with no action at all breaks the streak. P&L, on the other hand, only cares whether you were right.