selfDelegatorAddress is the self-delegator, which is the owner of the validator
initial delegation from the self-delegator to its validator
minSelfDelegation is the minimum uscrt amount that the self delegator must delegate to its validator.
pubkey is a base64 string representation of the validator's ed25519 pubkey (32 bytes).
selfDelegatorAddress is the self-delegator, which is the owner of the validator