# Security audits (https://docs.ton.org/llms/audits/content.md)



The reports below document external security assessments of TON blockchain components. Each report applies to the scope and code version it identifies. Audits do not guarantee that software is free of vulnerabilities.

<Callout type="note">
  Responsibly report genuine security issues through the [TON Security Bug Bounty program](https://github.com/ton-blockchain/bug-bounty).
</Callout>

## TON Blockchain [#ton-blockchain]

* [Trail of Bits audit report](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TON_Blockchain_ToB.pdf)
* [SlowMist audit report](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TON_Blockchain_SlowMist.pdf)
* [CertiK audit report](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TON_Blockchain_CertiK.pdf)
* [CertiK formal verification of masterchain contracts](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TON_Blockchain_Formal_Verification_CertiK.pdf)

## TON Blockchain library, `tonlib` [#ton-blockchain-library-tonlib]

`tonlib` is the native C++ client library for TON blockchain.

* [Zellic security assessment](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TON_Blockchain_tonlib_Zellic.pdf)

## TVM [#tvm]

* [Trail of Bits: TVM and Fift audit report](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TVM_and_Fift_ToB.pdf)
* [Trail of Bits: 2023 TVM upgrade audit report](https://raw.githubusercontent.com/ton-community/ton-docs/refs/heads/main/static/audits/TVM_Upgrade_ToB_2023.pdf)