The cards I have can store any low 2^x (64 wasn't a random choice). If the number of sats was written in binary... And if it only needs one ...1. 1,2,4,8,16,32, etc... It seems to use ~246 bytes. If you need two binary 1's, such as 3, 5, 6, 9 uses just under 400 bytes. If it needs 3 binar...