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Solidity Attacks

Access private data on the Ethereum blockchain

In this tutorial I will explain how to access private data on the Ethereum blockchain. All data on the blockchain…

Solidity Attacks

Reentrancy attack in a Solidity smart contract

A reentrancy attack in a Solidity smart contract is a common exploit. These attacks can completely drain your smart contract…

Solidity Samples

Covered call smart contract in Solidity

Below is a Solidity covered call smart contract. The seller deposits tokens into the contract and earns a fee selling…

Solidity Samples

Create a multi sig (signature) wallet in Solidity

Create a multi sig (signature) wallet in Solidity. Most cryptocurrency wallets need one signature (private key) to sign and process…

Solidity Samples

Delegate call to upgrade a solidity smart contract

Use a delegate call to upgrade a Solidity smart contract. A delegate call function runs code of the call in…

Solidity Attacks

Arithmetic Overflow and underflow

Envision an older car’s odometer (non digital) that only supports 999,999. Once it crosses 999,999 it will revert back to…

Mining & Nodes

Ethereum GETH Node Configuration in Docker

To get started using Ethereum GETH download and Install GETH from Docker or the GETH home page. On their website…

Resources

Ethereum Gas Resources

Use the link below to determine the current gas prices on the Ethereum network. One can use Etherscan too as…

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