In this module, we have discussed how transactions work on the bitcoin system. We started with one transaction, progressed to a block of them and then chained the different blocks to get the blockchain–a public ledger of all the transactions that have ever occurred on the bitcoin network.

But, what exactly does the blockchain contain? When a miner validates a transaction, what exactly is he doing? To know more about why the bitcoin protocol is designed the way it is, do check out the next and the final module!