code: def verify_key() -> SyftVerifyKey:
      signing_key = SyftSigningKey.generate()
      verify_key: SyftVerifyKey = signing_key.verify_key
      return verify_key
  
imports: import numpy
  import pytest
  from syft.node.credentials import SyftSigningKey
  from syft.node.credentials import SyftVerifyKey
  from syft.service.action.action_graph import InMemoryActionGraphStore
  from syft.service.action.action_graph import InMemoryGraphConfig
  from syft.service.action.action_graph import NetworkXBackingStore
  from syft.service.action.action_graph import NodeActionData
  from syft.service.action.action_graph import NodeType
  from syft.service.action.action_graph_service import ActionGraphService
  from syft.service.action.action_object import Action
  from syft.service.action.action_object import ActionObject
label_desc: Use image node_id 3 for calling a global function with example usage: verify_key() and returns: verify_key