txsMsg method
Implementation
Uint8List txsMsg(int v, BigInt r, BigInt s) {
if (v == 0 || v == 1) {
data.v = v;
} else if (v == 27 || v == 28) {
data.v = v - 27;
} else {
data.v = v;
}
data.r = r;
data.s = s;
return serialize();
}