Smart Contract CTF game

The CTF questions about smart contracts

Solutions

VXCTF 2018

• SanityCoin
• MultipleCoin
• NoMoneyNoCoin
• RPSCoin
• DeflationCoin (Not solved)

ethernaut.zeppelin.solutions

• CoinFlip
• Fallback
• Telephone
• Force
• King
• Elevator

Codefest'18

• Spiritual Box

Solutions By Class

Overflow/Underflow

• MultipleCoin

Forcing Ether into Contract

• NoMoneyNoCoin
• Force
• Spiritual Box

Fake Random

• CoinFlip
• RPSCoin

Unclassified (yet)

• SanityCoin
• DeflationCoin (Not solved)
• Fallback
• Telephone
• King
• Elevator

Useful Resource

• A survey of attacks on Ethereum smart contracts
• Ethereum Smart Contract Best Practices
• Onward with Ethereum Smart Contract Security
• (Not So) Smart Contracts
• How to Secure Your Smart Contracts: 6 Solidity Vulnerabilities and how to avoid them (Part 1)
• How to Secure Your Smart Contracts: 6 Solidity Vulnerabilities and how to avoid them (Part 2)
• Two Ways of Forcing Ether into a Contract
• Predicting Random Numbers in Ethereum Smart Contracts Slide
• Solidity Cheat Sheet

Practices

• Zeppelin Contest
• Hack This Contract