Can blockchain be used for auditing? It has been argued that with the use of blockchain in auditing, the transaction and the record of the transaction will be the same thing. What does this mean?
the transaction are all available here: 

http://www.blockchain.info

or here: 

http://www.blockexplorer.com

or if you set up a full node on your own machine. 

for a transaction to be valid it needs to appear on that global auditable log