The State Commitment represents the current state of that identity:

state_commitment = H(
  identity_root,
  control_key,
  recovery_key,
  attributes_root,
  policies_root
)

• control_key – active key used for daily actions
• recovery_key – root for recovery / guardians
• attributes_root – commitment to private attributes in the vault
• policies_root – commitment to the current policy set

Every update (new address, new policy, key rotation) creates a new state commitment, but the identity_root stays the same.