> For the complete documentation index, see [llms.txt](https://docs.emsigner.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emsigner.com/key-concepts/trust-service-providers.md).

# Trust Service Providers

Certified organizations that verify identities and safeguard digital transactions.

A **Trust Service Provider (TSP)** ensures security, authenticity, and legal validity in digital transactions.

Key functions:

* Issue/manage digital certificates
* Provide timestamping services
* Validate signatures for authenticity and integrity
* Secure storage of signed documents
* Detect tampering after signing

**Regional regulation examples:**

* India – licensed under the IT Act
* EU – regulated by eIDAS

**Prominent TSPs:** eMudhra, DigiCert, GlobalSign, Entrust.