§ Blockchain

<h2 id="frontrunning">Frontrunning</h2>
<p>The EIP-20 token's <code>approve()</code> function creates the potential for an approved spender to spend more
than the intended amount. A
front running attack can be
used, enabling an approved spender to call <code>transferFrom()</code> both before and after the call to
<code>approve()</code> is processed. More details are available on the
<a href="https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md#approve">EIP</a>, and in
<a href="https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/edit">this document</a>.</p>
<h2 id="standardization">Standardization</h2>
<p>Generally speaking, smart contracts of tokens should follow an accepted and stable standard.</p>
<p>Examples of currently accepted standards include:</p>
<ul>
<li><a href="">EIP20</a></li>
<li><a href="">EIP721</a> (non-fungible token)</li>
<li>More at <a href="https://eips.ethereum.org/erc#final">eips.ethereum.org</a></li>
</ul>

Learn about frontrunning risks in EIP-20 token approvals and the importance of following accepted Ethereum token standards like EIP-20 and EIP-721 for secure smart contracts.

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