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Audits
The OmniBridge and xDai Bridge have undergone multiple independent security audits and assessments.
omnibridge audit
xdai bridge audit
security audit

The OmniBridge and xDai Bridge have undergone multiple independent security audits and assessments. We have engaged in the auditing process after introducing major functionality, and have acknowledged and/or fixed all issues found during these audits. Audit results are presented starting with the most recent.

xDAI bridge upgrade Audit by Omega and ChainSafe

Omega

Completed: August 31, 2023
Conclusion: 2 medium issues, 5 low risk issues, 3 info issues. All issues has been resolved.
Contracts: https://github.com/gnosischain/tokenbridge-contracts/tree/xdaibridge-upgrade-sdai
Audit Report: Omega Gnosis Bridge Final Audit Report

ChainSafe

Completed: August 31, 2023
Conclusion: 2 minor issues, 2 optimizational issues.
Contracts: https://github.com/gnosischain/tokenbridge-contracts/tree/xdaibridge-upgrade-sdai
Audit Report: ChainSafe Audit Report

Reference: Savings xDAI

OmniBridge v6.0 Smart Contracts Audit by ChainSecurity

Completed: September 7, 2021
Conclusion: 0 Critical Risk Issues, 1 High Risk Issue Mitigated, 1 Medium Issue Mitigated, 2 Corrected, 13 Low Risk Issues all Acknowledged and/or Corrected.
Contracts: https://github.com/poanetwork/omnibridge
Audit Report: ChainSecurity v6.0 Audit

OmniBridge Audit by ChainSecurity

Completed: April 27, 2021
Conclusion: 0 Critical or High Risk Issues, 2 Medium Issues Accepted, 3 Low Risk Issues Accepted/Acknowledged
Contracts: https://github.com/poanetwork/omnibridge
Audit Report: Chainsecurity OmniBridge Audit

TokenBridge Audit by Quantstamp (covers OmniBridge)

Completed: November 6, 2020
Conclusion: No high and medium risk issues found, all low risk issues addressed.
Contracts: Revised in version 5.5.0-rc0 to address audit. https://github.com/poanetwork/tokenbridge-contracts/releases/tag/5.5.0-rc0
Audit Report: TokenBridge Audit by Quantstamp - OmniBridge

TokenBridge Audit by Quantstamp (covers AMB bridge)

Completed: January 8, 2020
Conclusion: : All high risk issues resolved and low risk issues addressed. More information available in this post.
Contracts: Revised in version 3.3.0 to address audit. https://github.com/poanetwork/tokenbridge-contracts/releases/tag/3.3.0
Audit Report: TokenBridge Audit by Quantstamp - AMB Bridge

Smart Contracts Security Analysis by SmartDec

Completed: July 2019
Conclusion: All of the issues were addressed, some of them fixed in the latest version of the code.
Contracts: Revised in version 2.3.3 to address audit. https://github.com/poanetwork/tokenbridge-contracts/releases/tag/2.3.3
Audit Report: SmartDec Security Audit

Initial TokenBridge Audit by Peppersec:

Completed: October 2018
Conclusion: Rated the overall security level of the system as “High”.
Contracts: Updated to version 2.0.0 to address audit. https://github.com/poanetwork/tokenbridge-contracts/releases/tag/2.0.0
Audit Report: Peppersec Initial TokenBridge Audit