> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Multi-Party Computation

> A technique allowing multiple participants to jointly compute or control a cryptographic operation without revealing their private inputs.

# Multi-Party Computation

A technique allowing multiple participants to jointly compute or control a cryptographic operation without revealing their private inputs.

## Definition

A technique allowing multiple participants to jointly compute or control a cryptographic operation without revealing their private inputs.

## Why it matters

Cryptography provides the mathematical foundation for keys, signatures, privacy, integrity, and verification.

## How it works

It uses secret sharing schemes, such as Shamir's Secret Sharing, to split a key into multiple pieces. When a transaction needs to be signed, the participants perform a distributed computation to generate the signature from their pieces. The full private key is never reconstructed, meaning an attacker would need to compromise multiple nodes simultaneously.

## Real-world example

Fireblocks and various enterprise-grade crypto wallets use MPC to secure large-scale institutional digital asset portfolios.

## Advantages

* Eliminates single point of failure
* Enhances institutional security
* No full key reconstruction

## Limitations

* Higher computational overhead
* Complex integration requirements
* Requires multiple active nodes

## Common misconceptions

* Many confuse MPC with multi-sig, but MPC creates a single signature, whereas multi-sig involves multiple distinct signatures on-chain.
* Some assume MPC makes a wallet immune to all hacks, but security still depends on node integrity.

## Related knowledge

* [Hash Function](/generated/v2/glossary/hash-function) — term

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**Canonical knowledge ID:** `glossary:multi-party-computation`