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maurelian /
Created Feb 10, 2020
Some optimistic rollups resources I found helpful

Start with these resources


About rust security and auditing

  • Review clippy warnings; most of the time these are benign or irrelevant, but they can help spotting red flags.
  • Build and run all the unit tests, assess the code coverage and keep note of the un(der)tested component.
  • Review the dependencies listed in Cargo.toml and Cargo.lock: Will the latest version be used? (preferable but not always the right choice) Are these established, trustworthy packages? You may use the subcommand cargo-audit (thanks @dues__ for the pointer).
  • Look for unsafe code blocks, and evaluate the risk (can an attacker control the input used in these blocks? etc.)
  • Look for risky uses of unwrap(), which can cause panics, as opposed to pattern-matched error
View gist:c6078a6a6e0a7bcf3fed22bc9e363330
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View delegatesToLib.asm
======= /Users/primary/Projects/Audits/0x-monorepo/contracts/exchange/contracts/src/delegatesToLib.sol:Math =======
EVM assembly:
/* "/Users/primary/Projects/Audits/0x-monorepo/contracts/exchange/contracts/src/delegatesToLib.sol":25:312 library Math {... */
/* "--CODEGEN--":132:134 */
/* "--CODEGEN--":166:173 */
View delegatesToLib.sol
pragma solidity ^0.5.9;
library Math {
function add(uint a, uint b) public returns (uint){
return a + b;
contract UsesMath {
using Math for uint;

Feel free to copy and paste this list into a README, issue or elsewhere in your project.

Audit prep checklist (reference)

  • Documentation (A plain english description of what you are building, and why you are building it. Should indicate the actions and states that should and should not be possible)
    • For the overall system
    • For each unique contract within the system
  • Clean code
    • Run a linter (like EthLint)
    • Fix compiler warnings

NSLOC stands for 'Normalized Source Code', which is a custom measurement we use (among others) when evaluating the complexity of a codebase.

To get the NSLOC count of a file:

  1. For all functions, reduce any multiline function declarations to a single line.
  2. Remove all comments
  3. Remove all empty lines
  4. Count the remaining lines


maurelian / SpankChainHack.sol
Last active Oct 12, 2018
ctrl+f for 'Hack Note' for a few annotations of red flags
View SpankChainHack.sol
// Taken from
// Story:
// Newsletter:
pragma solidity ^0.4.23;
// produced by the Solididy File Flattener (c) David Appleton 2018
// contact :
// released under Apache 2.0 licence
contract Token {
/* This is a slight change to the ERC20 base standard.
View typechecking.sol
pragma solidity ^0.4.0;
contract ISomething {
function fooSomething() returns(uint);
contract BarGuy {
// This internal function use the type system for additional safety guarantees onthe input addres.
function barThing (ISomething _iSomething) internal returns(uint){
uint x = _iSomething.fooSomething();
View gist:6c6ee72b2d63efc5d17db5d07cc04a85
pragma solidity ^0.4.24;
contract Delegator {
bytes32 controllerLookupName = 0xabba;
function() external payable {
// Do nothing if we haven't properly set up the delegator to delegate calls
// if (controllerLookupName == 0) {
// return;
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