code: func StateTrieID(header *types.Header) *TrieID {
  	return &TrieID{
  		BlockHash:   header.Hash(),
  		BlockNumber: header.Number.Uint64(),
  		AccKey:      nil,
  		Root:        header.Root,
  	}
  }
docs: // StateTrieID returns a TrieID for a state trie belonging to a certain block
  // header.