code: public BlockInfo queryBlockByTransactionID(Peer peer, String txID) throws InvalidArgumentException, ProposalException {
          return queryBlockByTransactionID(Collections.singleton(peer), txID);
      }
docs: query a peer in this channel for a Block by a TransactionID contained in the block
  
  <STRONG>This method may not be thread safe if client context is changed!</STRONG>
  
  @param peer the peer to send the request to
  @param txID the transactionID to query on
  @return the {@link BlockInfo} for the Block containing the transaction
  @throws InvalidArgumentException
  @throws ProposalException