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<p>in 2014 describes the <a href="page.php?w=Bitcoin_protocol">Bitcoin protocol</a> as a weak version of the smart contract concept as originally defined by <a href="page.php?w=Nick_Szabo">Nick Szabo</a>, and proposed a stronger version based on the <a href="page.php?w=Solidity">Solidity</a> language, which is <a href="page.php?w=Turing_complete">Turing complete</a>. Since then, various cryptocurrencies have supported <a href="page.php?w=programming_language">programming language</a>s which allow for more advanced smart contracts between untrusted</p><p>
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