Components involved with the tzBTC bridge have been audited by third party resarchers. Please find the audits below:
Android App, audited by Compass Security in March/April 2024
tzbtc-bridge/audits/report_89395_Pentest_tzBTC_Android_App_v1.0.pdf
Tezos smart contract, audited by Inference AG in March/April 2024
tzbtc-bridge/audits/Inference AG - TF - tzBTCv2 - v1.0.pdf
Also published on Inference's Github repsitory, here: https://github.com/InferenceAG/ReportPublications
Audited by Inference AG in March/April 2024
tzbtc-bridge/audits/Inference AG - TF - tzBTCv2 - v1.0.pdf
Also published on Inference's Github repsitory, here: https://github.com/InferenceAG/ReportPublications
Tezos smart contract, audited by Least Authority in March 2020
https://github.com/tf-gh/tzBTC
Also published on the least Authority Website, here: https://leastauthority.com/blog/audits/tezos-foundation-tzbtc-audit/