As the record of a cryptocurrency’s entire transaction history to date, a blockchain has a finite length — containing a finite number of transactions — that increases over time.
And new cryptocurrency applications take root with impressive frequency — Cryptomaniaks has a great look at the fast-growing world of cryptocurrency sports betting sites as just one example.

Popular cryptocurrencies such as Bitcoin and Ethereum are built on blockchain technology. Blockchains like Bitcoin and Ethereum are constantly growing as new blocks are added to the chain, increasing the security of the ledger dramatically.
— In a 1,500-word memo obtained by The New York Times over the weekend, the company’s top lobbyist, Nick Clegg, sought to rebut Haugen’s allegations ahead of her unveiling in an episode of “60 Minutes” on Sunday night. “Social media has had a big impact on society in recent years, and Facebook is often a place where much of this debate plays out,” he said in the memo, in which he called Haugen’s impending accusations, which included blaming Facebook for January’s insurrection at the Capitol, “misleading.” He wrote that “what evidence there is simply does not support the idea that Facebook, or social media more generally, is the primary cause of polarization.”