> For the complete documentation index, see [llms.txt](https://docs.guardianservice.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.guardianservice.app/technical-information/users/standard-registry-users-schemas-and-policies/policies/capture-replay-and-compare-data-for-published-policies.md).

# Capture, Replay, and Compare Data for Published Policies

Guardian provides a Capture and Replay mechanism that allows you to:

* Automatically record all actions performed by a policy after it is published
* Store immutable execution records on Hedera with payloads persisted in IPFS
* Import recorded executions when re-importing a policy
* Replay those executions in Dry Run mode
* Compare results between the originally published run and the Dry Run execution

This capability is especially useful for:

* Regression testing
* Validating policy changes
* Auditing and traceability
* Debugging behavior differences between versions