Technical Definition
Key Share
A key share is a cryptographic fragment held by one participant in a distributed key or signing scheme.
By Crypto University Editorial
Threshold Signature Scheme (TSS)MPC WalletSigner
✦ Key Insight
It is fundamental to MPC and threshold-signature wallet security.
✕ Common Misconceptions
A key share is sensitive secret material even when it is incomplete.
Detailed Explanation
Depending on the protocol, shares may jointly sign without reconstructing the full private key.
In Practice
“Three devices each hold a share in a 2-of-3 threshold-signing wallet.”
Dig Deeper
Private Key
The secret number that authorises spending from a crypto address.
MPC Wallet
An MPC wallet uses multi-party computation so signing authority is divided among multiple parties or devices without reconstructing one full private key in a single place.
Threshold Signature Scheme (TSS)
A Threshold Signature Scheme lets a defined threshold of participants cooperate to create one valid digital signature.
Recovery Share
A recovery share is one part of a threshold backup scheme used with other shares to reconstruct wallet recovery material.