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Since 2012, Trail of Bits has helped secure some of the world's most targeted organizations and devices.

We combine high-end security research with a real-world attacker mentality to reduce risk and fortify code.

Some of our work:


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  1. slither slither Public

    Static Analyzer for Solidity and Vyper

    Python 6.2k 1.1k

  2. medusa medusa Public

    Parallelized, coverage-guided, mutational Solidity smart contract fuzzing, powered by go-ethereum

    Go 469 86

  3. echidna echidna Public

    Ethereum smart contract fuzzer

    Haskell 3.1k 426

  4. building-secure-contracts building-secure-contracts Public

    Guidelines and training material to write secure smart contracts

    Solidity 2.5k 385

  5. solc-select solc-select Public

    Manage and switch between Solidity compiler versions

    Python 808 112

  6. properties properties Public

    Pre-built security properties for common Ethereum operations

    Solidity 363 57

Repositories

Showing 10 of 65 repositories
  • crytic-compile Public

    Abstraction layer for smart contract build systems

    crytic/crytic-compile’s past year of commit activity
    Python 196 AGPL-3.0 90 84 (16 issues need help) 12 Updated Apr 14, 2026
  • slither Public

    Static Analyzer for Solidity and Vyper

    crytic/slither’s past year of commit activity
    Python 6,200 AGPL-3.0 1,095 367 (28 issues need help) 84 Updated Apr 14, 2026
  • solc-select Public

    Manage and switch between Solidity compiler versions

    crytic/solc-select’s past year of commit activity
    Python 808 AGPL-3.0 112 9 (2 issues need help) 7 Updated Apr 14, 2026
  • pyevmasm Public

    Ethereum Virtual Machine (EVM) disassembler and assembler

    crytic/pyevmasm’s past year of commit activity
    Python 386 Apache-2.0 51 10 10 Updated Apr 14, 2026
  • building-secure-contracts Public

    Guidelines and training material to write secure smart contracts

    crytic/building-secure-contracts’s past year of commit activity
    Solidity 2,461 AGPL-3.0 385 36 (8 issues need help) 22 Updated Apr 13, 2026
  • medusa Public

    Parallelized, coverage-guided, mutational Solidity smart contract fuzzing, powered by go-ethereum

    crytic/medusa’s past year of commit activity
    Go 469 AGPL-3.0 86 47 (10 issues need help) 25 Updated Apr 12, 2026
  • echidna Public

    Ethereum smart contract fuzzer

    crytic/echidna’s past year of commit activity
    Haskell 3,109 AGPL-3.0 426 73 (1 issue needs help) 34 Updated Apr 8, 2026
  • properties Public

    Pre-built security properties for common Ethereum operations

    crytic/properties’s past year of commit activity
    Solidity 363 AGPL-3.0 57 18 17 Updated Mar 9, 2026
  • crytic.nix Public

    A flake.nix for easy access to crytic tools

    crytic/crytic.nix’s past year of commit activity
    Nix 2 0 0 0 Updated Mar 3, 2026
  • medusa-geth Public

    A go-ethereum fork enabling additional testing capabilities for medusa

    crytic/medusa-geth’s past year of commit activity
    13 2 0 1 Updated Feb 19, 2026

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