Prefix for Monero subaddresses.
Monero subaddresses typically start with the byte sequence 83, 117, 98, 65, 100, 100, 114, 0.
83, 117, 98, 65, 100, 100, 114, 0
static const subaddrPrefix = [83, 117, 98, 65, 100, 100, 114, 0];