docs: def create_from_hash(hash, ezo):
          '''
          given the hash of a contract, returns a contract  from the data store
          :param hash: (string) hash of the contract source code
          :param ezo: ezo instance
          :return: contract instance, error
          '''
  
          cp, err = ezo.db.get("contracts", hash)
          if err:
              return None, err
  
          # create a new Contract
          c = Contract(cp["name"], ezo)
          c.abi = cp["abi"]
          c.bin = cp["bin"]
          c.hash = cp["hash"]
          c.source = cp["source"]
          c.timestamp = cp["timestamp"]
          c.te_map = cp['te-map']
  
          return c, None