Top deposit reward

One active deposit can hold the crown, and the crown earns a tithe (a small slice taken from every acquisition fee before the equal split) that builds into a visible, growing reward pot. When the crowned deposit leaves the pool or is overtaken, the pot earned during its tenure pays out to its depositor. The crown is a challenge against the current holder, not a continuously ranked leaderboard ¹:

• An empty crown is taken automatically by the next deposit, or claimed by any active position.
• To take an occupied crown, a challenger must beat the current backing by a set margin (so it doesn't flip on a tiny overtake). The old holder's pot pays out to them.
• Shrinking your own backing gives up the crown: you can't grab it with a large deposit, then quietly drop down to hold it on the cheap.
• With no crown, the tithe just folds back into the equal split, so nothing is lost.

The reward is exclusive to one current holder. The contract does not scan for or automatically backfill the absolute largest deposit, so a vacant crown can be claimed by any active position and a slightly larger position may still fall short of the takeover threshold.