// SendRawTransaction implements eth_sendRawTransaction. Creates new message call transaction or a contract creation for previously-signed transactions.
// SendTransaction implements eth_sendTransaction. Creates new message call transaction or a contract creation if the data field contains code.
// Note: Use eth_getTransactionReceipt to get the contract address, after the transaction was mined, when you created a contract
// Parameters:
// Object - The transaction object
// from: DATA, 20 Bytes - The address the transaction is send from
// to: DATA, 20 Bytes - (optional when creating new contract) The address the transaction is directed to
// gas: QUANTITY - (optional, default 90000) Integer of the gas provided for the transaction execution. It will return unused gas
// gasPrice: QUANTITY - (optional, default To-Be-Determined) Integer of the gasPrice used for each paid gas
// value: QUANTITY - (optional) Integer of the value sent with this transaction
// data: DATA - The compiled code of a contract OR the hash of the invoked method signature and encoded parameters. For details see Ethereum Contract ABI
// nonce: QUANTITY - (optional) Integer of a nonce. This allows to overwrite your own pending transactions that use the same nonce
// Returns:
// DATA, 32 Bytes - The transaction hash, or the zero hash if the transaction is not yet available