string eth_sendRawTransaction(string _transactionRLP)
Accepts a transaction RLP list of the following items:
u256 nonce;
u256 gasPrice;
u256 gasLimit;
hash32 toAddress (could be empty)
u256 value
bytes data;
byte v (in form 27 + (0|1) and so on)
h256 r
h256 s
and apply on top of the current chain configuration. (add it to a block which is yet not finalized)
returns the hash of the imported transaction if transaction is valid. or 0 if it's not.