A blockchain is public ledger of transactions that is distributed among all participants in a market or system. Each transaction that happens within a market or system must be verified by a strong majority of participants. It's very difficult to falsify transactions in a blockchain because each transaction generates a strong cryptographic signature.
We all have our areas of interest -- make that obsession -- and when something related to them crops up online, we can be instantly transformed into monster click machines. The problem here: Many of those clicks can either lead to your victimization or becoming an unwitting co-conspirator in cybercrime.