This v2.7.0 is a feature release, and has been deployed on the Crossbell mainnet.

V2.7.0

Features:

• Off-chain sign for grant operators
  • We added a grantOperatorPermissionsWithSig method to support off-chain signing for specific scenarios. Users can grant operators by sending their off-chain signatures to relayers, who could be DApp developers that will directly interact with the blockchain and pay the gas fee. More details can be found here.