: any of various cryptocurrencies that are regarded as alternatives to established cryptocurrencies and especially to Bitcoin
Since then, thousands of new altcoins … have been created and added into the crypto ecosystem. "Altcoin" refers to any type of cryptocurrency other than Bitcoin. Meghan DeMatteo
Ethereum's surge has triggered wider interest in the altcoin universe from retail investors with cash to burn …Postmedia Breaking News
… major cryptocurrency projects like Bitcoin and Ethereum, and smaller altcoins …benzinga.com