> For the complete documentation index, see [llms.txt](https://tgbtc.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tgbtc.gitbook.io/docs/whitepaper/key-concepts/additional-components-and-security-mechanisms.md).

# Additional Components and Security Mechanisms

### Jump right in

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="files"></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Bitcoin Transaction Fees</strong></td><td></td><td></td><td></td><td><a href="/pages/cpH5PNdFq5gQihQE01RU">/pages/cpH5PNdFq5gQihQE01RU</a></td></tr><tr><td><strong>Validator Rotation and Key Management</strong></td><td></td><td></td><td></td><td><a href="/pages/rWZOOYBD6FYtAsDenUSf">/pages/rWZOOYBD6FYtAsDenUSf</a></td></tr><tr><td><strong>Refund Mechanism for Expired Deposits</strong></td><td></td><td></td><td></td><td><a href="/pages/7VZ8qLEOPUyxHsDDho4b">/pages/7VZ8qLEOPUyxHsDDho4b</a></td></tr><tr><td><strong>Consensus-based System Updates</strong></td><td></td><td></td><td></td><td><a href="/pages/JdlgwfdwUVTBSigU9hzs">/pages/JdlgwfdwUVTBSigU9hzs</a></td></tr><tr><td><strong>Inspectors</strong></td><td></td><td></td><td></td><td><a href="/pages/u45Odmq3p1l3H6sL58nl">/pages/u45Odmq3p1l3H6sL58nl</a></td></tr></tbody></table>