> For the complete documentation index, see [llms.txt](https://docs.transferchain.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.transferchain.io/transferchain-sdk/s4/using-transferchain-s4/blockchain.md).

# Blockchain

Every action (upload, download, share, delete) is immutably logged on TransferChain’s blockchain ledger.

The blockchain layer ensures:

* Tamper-proof audit trails
* Cryptographic traceability of access and changes
* Zero-trust compatibility

To query blockchain logs related to your data, contact our team or use the suite provided with enterprise deployments.