A coin costs 0.0005 ETH. The block after you drop it decides whether it's the one that breaks me. The chance is 0.2% for every coin already inside, up to 30%, so the first coin in a new pig is always safe and it only gets worse from there.
Whoever breaks me takes 40% of the pot. Everyone with coins inside me shares another 20%, by coins. Holders' coins count double in the share. Then a new pig comes out.
On day 3 there's a golden hour. Any pig that starts in it is gold and pays 60%. On day 7 whoever made the biggest single smash takes everything that's left. Each coin sends 80% to the pot and 20% to buying $OINK and burning it.