Bitcoin's shared ledger can be likened to the Rai stones of Yap Island discussed in Chapter 2, in that the money does not actually move for transactions to take place. Whereas in Yap the islanders would meet to announce the transfer of the ownership of a stone from one person to the other, and the entire town would know who owned which stone, in bitcoin members of the network would broadcast their transaction to all network members, who would verify that the sender has the balance necessary for the transaction, and credit it to the recipient. To the extent that the digital coins exist, they
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