Threshold Signatures Scheme

[robert-zaremba]

Today, Cosmos-SDK supports basic constructions for Multisig: an object composed of primitive public keys and treschold information.

This implementation is relatively simple and works well. However there are few disadvantages:

• multisig composition is transparent and known, less privacy
• consumes more space (we need to store all primitive sub-signatures), higher fees

Here I want to check on a need for Threshold Signatures based on Multi-Party Computation (MPC), where no single entity has a full key access, and the transaction and signature looks like a primitive (BaseAccount) transaction. Clear advantage of such approach is:

• Increased privacy, the threshold based account is indistinguishable from a regular account
• Sub-keys are not know (event to the involved parties)

References:

• Terra (Cosmos-SDK based blockchain) recently partnered with ZenGo to use their infrastructure for treschold signatures integration.

[faddat]

This would absolutely be helpful.

[faboweb]

Does this need a change to the SDK? Wouldn't the sigs be created off-chain and be transparent to the SDK?

[tac0turtle]

Nope. With accounts and without nothing is needed