Some offer programs can also earn a user some bitcoins. They include: TryBTC whose interactive tutorials teach the concepts wallets, addresses, transactions, and the blockchain and give a small amount of bitcoin for charitable causes and share with friends; Bitalo.com which lets users earn $5 of free bitcoins by signing up and get a verified account or by referring new users; and Bitcoinreward which helps users earn bitcoins by completing simple tasks such as watching videos, checking search engine results and small surveys.