Blockchain

The KMS blochhain is implemented using the Cosmos framework. More specifically with Comet BFT. This is a permissioned blockchain that is based on BFT consensus that allows for high throughput and low latency, but only supports a small number of validators (since consensus requires mutual interaction between all validator).

The blockchain handles all decryption, reencryption, and key management operations between all fhEVM chains, co-processors etc. and the KMS engine.

Smart contracts

• ISC (Inclusion proof Smart Contract): Smart contract which handles validation of decryption/re-encryption requests for a specific fhEVM. Thus is contains custom logic for validation for a single fhEVM.

• ASC (Application Smart Contract): A single smart contract to which transaction from the gateway (connector) are submitted to for all fhEVM's. All requests will pass through this contract and decryption and re-encryption requests will be validated by the appropriate ISC contract.

Payment

All operations must be paid for with tokens. Currently the tokenomics is not implemented and hence tokens can be constructed freely using a focet.

Deployment

The KMS blockchain is deployed using n servers where n is the number of MPC parties. Each run their own validator docker image but is depoyed on the same machine as each of the MPC parties.