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Returns a hex-encoded proof that "txid" was included in a block.


NOTE: By default this function only works sometimes. This is when there is an unspent output in the utxo for this transaction. To make it always work, you need to maintain a transaction index, using the -txindex command line option or specify the block in which the transaction is included manually (by blockhash).


  1. "txids" (string) A json array of txids to filter
      "txid"     (string) A transaction hash
  2. "blockhash" (string, optional) If specified, looks for txid in the block with this hash


"data" (string) A string that is a serialized, hex-encoded data for the proof.