Re-entrancy attacks in Ethereum smart contrats

A re-entrancy attack is a type of vulnerability that can occur in smart contracts that allow an attacker to repeatedly call an external contract in a way that consumes all available gas. This can lead to a denial of service (DoS) attack or allow the attacker to exploit the contract for their own benefit.

Here is an example of a simple contract written in Solidity that is vulnerable to a re-entrancy attack:

pragma solidity ^0.6.0;

contract ReentrancyAttack {
    // The …

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