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Contract Cops
  • Mastering Ethereum Book
    • What is ethereum?
    • Tokens
    • Oracles
    • Decenralized Applications(DApps)
    • The Ethereum virtual machine
    • Ethereum basics
    • Ethereum clients
    • Cryptography
    • Wallets
    • Transactions
    • Chapter 7 - Smart Contracts & Solidity
    • Side Notes
      • Tokens
      • Smart Contracts and Solidity
  • Cryptography
    • Ethereum Cryptography - Cheatsheet
    • Assymetric vs symmetric cryptography
    • ECDSA vs RSA
    • Elliptic curves and ECDSA
    • Sha-256 Example
    • Sha-256
    • What are the different steps in SHA-256?
  • Ethereum Blocks
    • Block Headers
  • Learning Solidity
    • Storage vs memory
    • Upgradeable contracts
      • Proxy pattern in smart contracts
  • PoS
    • Proof of stake
  • PoW
    • PoW
  • Tokens
    • ERC-1155
    • ERC20
  • Cryptonomics
    • Automated market makers
    • Collateral Tokens
    • Collateralized Stablecoin
    • Fiat currency
    • Liquidity pool
    • Open Position: Meaning and Risk in Trading
    • Slippage
    • Spot price
  • Common Attack Vectors
    • Checking access control
    • Access control issues on critical functions
    • Account Existence Check for low level calls
    • Account Existence Check
    • Common attacks with contract/EOA addresses
    • Arithmetic under/overflow
    • Assert Attack
    • Assert require revert
    • Assert Violation
    • Bad Interface DOS
    • Bad pragma and compiler
    • Block Timestamp Manipulation
    • Bypassing contract check
    • Code With No Effects
    • Code size check vulnerability
    • Constructors with Care
    • Default Visibilities
    • Delegatecall
    • Delegatecall
    • Denial of Service (DoS)
    • DoS with block gas limit
    • Entropy Illusion
    • External contract referencing
    • Flash Loan Attack
    • Floating Point and Precision
    • Function selector abuse
    • Function selector abuse
    • Smart contract gas griefing
    • Hash collision parameters
    • Hash Collisions With Multiple Variable Length Arguments
    • Imprecise arithmetic
    • Improper Array Deletion
    • Incorrect array deletion
    • Incorrect interface
    • Insufficient Gas Griefing
    • Loop through long arrays
    • Message call with hardcoded gas amount
    • Not enough gas for ether transfer
    • Precision Loss in Calculations
    • Oracle Manipulation
    • Public Burn Function
    • Read-only reentrancy
    • Race Conditions/Front Running
    • Reentrancy Attacks
    • Reentrancy
    • Requirement Violation
    • Right-To-Left-Override control character (U+202E)
    • Shadowing State Variables
    • Short Address / Parameter attack
    • Signature Malleability
    • Signature Replay
    • Transaction Order Dependence
    • Tx.Origin Authentication
    • Unchecked CALL Return Values
    • Unexpected ether
    • Uninitialized Storage Pointers
    • Unsafe Ownership Transfer
  • EIP's
    • EIP155
    • EIP55
  • PoW
    • Ethash
    • Scrypt - RFC 7914
  • Questions for self evaluation
    • Questions 23/04/2023 (Nr: 84)
    • Usability guide for questions
  • Frequently asked questions
    • What is the difference between transaction and message?
    • What is the use of a interface or function without implementation?
  • UsefulResources
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