Security and efficiency

The security of the solution is based on the validator quorum (the set of validators that maintain the system). But at the same time, it should be understood that an increase in the number of validators who are responsible for managing the protocol and system itself leads to an increase in asset transfer time.

Asset transfer time

The time of migrating an asset or message is equal to the sum of…

1. block confirmation time in the parent blockchain

2. consensus time in the Rarimo core

3. block confirmation time in the destination blockchain

The time to reach consensus in the Rarimo core can be considered insignificant in relation to the time to reach consensus about ensuring irreversibility in external open networks, taking approximately five to seven seconds.

Threshold signature

The threshold signature scheme t-of-n is a scheme that presumes the participation of t+1 parties for creating a valid signature value.

The threshold signature consists of 2 principal parts:

1. Distributed Key Generation (DKG): some secret key is constructed (from secrets of all parties). At the end of a DKG, every party possesses some secret share from which the main secret key can be recovered. Each participant doesn’t know about the shares of other parties. This process is performed in 4 rounds. It is important to note that this scheme is different from the scheme with the trusted dealer, who has knowledge about the initial secret.

2. Signing itself: Any t+1 parties can sign a message, producing a single valid signature. This process is performed in 7 rounds (including one online) for the ECDSA signature scheme and in 3 rounds for EdDSA.

Note that the size of the threshold signature (and the algorithm for its verification) doesn’t depend on the number of parties involved. It means that the cost of signature verification will be the same as in the case of a single signature.