Top Definition
And alternative cryptocurrency to bitcoin. Bitcoin being the first cryptocurrency, any variation thereon is an Altcoin (or alt-coin)
"Litecoin is my favourite altcoin because it makes ASIC mining more difficulty"

"Namecoin is sort of an altcoin, but also a domain name system"
by Vinceypoos December 03, 2013

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.