> 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/about.md).

# About

**TransferChain S4** (Secure Simple Storage Service) is a Dockerized, S3-compatible secure object storage backend built on TransferChain’s patented privacy and security protocol. It ensures **end-to-end encryption**, **client-side data splitting**, and **blockchain-based audit logging** — providing unmatched confidentiality and compliance for enterprises and developers alike.

TransferChain S4 is storage-agnostic and integrates seamlessly with your existing infrastructure while enabling full control over **data residency**, **encryption keys**, and **transfer authorization**.

This documentation helps open-source developers get started with S4, explaining how to install, initialize, store and retrieve data, and manage transfer and blockchain components securely.