gettxoutproof

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).

Argument #1-txids

Type: json array, Required

Description: The txids to filter

     [
       "txid",    (string) A transaction hash
       ...
     ]

Argument #2-blockhash

Type: string, Optional

Description: If specified, looks for txid in the block with this hash

Result

Type: string (hex)

Description: A string that is a serialized, hex-encoded data for the proof.