code: public BlockInfo queryBlockByTransactionID(Collection<Peer> peers, String txID) throws InvalidArgumentException, ProposalException {
          return queryBlockByTransactionID(peers, txID, client.getUserContext());
      }
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 peers the peers to try 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