> For the complete documentation index, see [llms.txt](https://docs.hop.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hop.exchange/basics/faq/what-is-a-transfer-bond.md).

# What is a "Transfer bond"?

A transfer bond is the bonding of a transfer root which distributes the transfer root from layer-1 to layer-2 destination rollup chains. Only the bonder role can do this and it requires a positive credit balance. Someone may challenge this transfer root if they believe it contains invalid transfers.

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