Threshold signature is one of the options for signing transactions on the blockchain. In this type of electronic signature, the private key is divided into X parts, and for it to be restored and signed, Y parts of it must be sufficient — X>Y. This means that users Y who know the private key must unite.
To generate, split and distribute key parts, it is necessary to create a user group with a defined leader.
Threshold signature has the same purpose as multisignature, but it partially works outside the network and all information about signers is formed in a single transaction, which reduces the cost of its implementation.