Submit transaction via stream

Description

As described in #35 the Stream could be analyzed prior to sending the transaction. Invalid Streams should be rejected.

The first byte appears to (not verified through specific reference) always be a major type 4 followed by the number of elements N.

An array (4 = 0b100) of length 3 = 0b0011 we be represented as 0b100_0011 resp. 0x83

Peek at the first byte and verify that it is a valid Type 4.

int type0 = 0x83 >> 4; // strip last four bits
bool valid = type0 == 4; // verify it is an array (4)

The second byte apears to always be a map major tyoe 5 of the same length as bytes[0].

An map (5 = 0b1001) of length 3 = 0b0011 we be represented as 0b1001_0011 resp. 0xA3

int type1 = 0xA3 >> 4;
int len0 = 0x83 & 0xf0;
int len1 = 0xA3 & 0xf0;
bool valid = (type1 == 5) && (len0 == len1);