carvalho is a silly man 1 bitcoin = 1 bitcoin 1 satoshi = 1 satoshi the 21 million btc (2.1 quadrillion sats) size is precisely based on the fact that is the nearest power of 10 you can fit into 64 bits and if you are going to divide the satoshis up (already in protocol to 1000 in lightning) you can devide them again by 21 quadrillion marvin is a silly man, did i mention that?