Sorry for the noob question, I don't understand what is a "block explorer"? Why is it needed? Does FCN support it?
From
https://en.bitcoin.it/wiki/Blocks :
Data is permanently recorded in the Bitcoin network through files called blocks. A block is a record of some or all of the most recent Bitcoin transactions that have not yet been recorded in any prior blocks. They could be thought of like the individual pages of a city recorder's recordbook (where changes to title to real estate are recorded) or a stock transaction ledger. In all but a few exceptional cases, new blocks are added to the end of the record (known in Bitcoin as the block chain), and once written, are never changed or removed. Each block memorializes what took place immediately before it was created.
As far as I know, all cryptocoins, like Fantomcoin, Bitcoin, etc., all use their own form of a blockchain to record transactions and other data. You can see the link above for more details. Although it's specific to Bitcoin, the same principles apply.
Edit: For example, if you go to
www.blockchain.info (has a blockchain explorer for Bitcoin), you can search by lots of criteria, including your BTC address, transaction hash, etc. Simply put, a blockchain explorer helps you to find and see data in the blockchain.