http://www.coindesk.com/new-forms-spam-bloat-bitcoins-block-chain/More recently, bitcoin’s public ledger, the block chain, has been recognised for its potential to serve as a low-cost means of recording cryptocurrency transactions and also other types of digital information.
Some, though, fear that unscrupulous actors will leverage this feature to turn the block chain into a cheap place to publish new types of spam, and that it could become ‘bloated’ as a result – in effect, overloaded with data that has nothing to do with its primary purpose.
