<object>- (optional) Configuration object containing the following field:
searchTransactionHistory:<bool> - if true, a Solana node will search its ledger cache for any signatures not found in the recent status cache
slot:<u64> - The slot the transaction was processed
confirmations:<usize | null> - Number of blocks since signature confirmation, null if rooted, as well as finalized by a supermajority of the cluster
err:<object | null> - Error if transaction failed, null if transaction succeeded.
<null>- Unknown transaction