# Threshold Signature Scheme (TSSig)

*Category: Phantom Secrets™.*

A form of MPC where the private key is never reconstructed at all. Instead, each participant produces a partial signature, and these are combined to form a complete digital signature. Unlike Phantom Secrets (where shares recombine inside a Toughkey), in TSSig the key never exists even ephemerally — only the final signature does. Lokblok implements TSSig directly in certified hardware, making it far stronger than software-only schemes.

**Read more:** [/architecture](https://www.lokblok.co/architecture)

## Related terms in Phantom Secrets™

- [Phantomizing](https://www.lokblok.co/glossary/phantomizing)
- [Regen Tokens](https://www.lokblok.co/glossary/regen-tokens)
- [Ephemeral](https://www.lokblok.co/glossary/ephemeral)
- [Toughkey™](https://www.lokblok.co/glossary/toughkey)
- [Multi-Party Computation (MPC)](https://www.lokblok.co/glossary/multi-party-computation)
- [Threshold Secret Sharing (TSShr)](https://www.lokblok.co/glossary/threshold-secret-sharing)
- [Hierarchical Signatures](https://www.lokblok.co/glossary/hierarchical-signatures)
- [Business-Logic-Enforced Cryptography](https://www.lokblok.co/glossary/business-logic-enforced-cryptography)

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