 JSON object, and 2 for JSON object with fee and prevout
3. blockhash    (string, optional) The block in which to look for the transaction

Result (if verbosity is not set or set to 0):
"str"    (string) The serialized transaction as a hex-encoded string for 'txid'

Result (if verbosity is set to 1):
{                                    (json object)
  "in_active_chain" : true|false,    (boolean, optional) Whether specified block is in the active chain or not (only present with explicit "blockhash" argument