Bitcoin is the first cryptocurrency. It has an open source that no one owns or controls. Its transactions and emissions are regulated by an extensive peer-to-peer network. The cryptocurrency uses a single database distributed on the network, included in a decentralized peer-to-peer network that uses an electronic digital signature and is supported by a proof-of-work protocol to ensure the security and legitimacy of the funds put into circulation.

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Hi everyone, Fran Finney, wife of Hal Finney, here. I’d like to share exciting news with you. Today the 3rd Running Bitcoin Challenge ( @RunningBTC21k ) is starting again.
 
Join us at https://t.co/YcfQGubYrA & let's heal ALS!

#RunningBitcoinChallenge 1/4

Hi everyone, Fran Finney, wife of Hal Finney, here. I'd like to share exciting news with you.