contract interface Remote =
  entrypoint main_fun : (int) => unit

contract AddrChain =
  entrypoint is_c(a : address) =
    Address.is_contract(a)

//   entrypoint get_c(a : address) : option(Remote) =
//     Address.get_contract(a)

//   entrypoint h_to_i(h : hash) : int =
//     Hash.to_int(h)

//   entrypoint a_to_i(a : address) : int =
//     Address.to_int(a) mod 10 ^ 16

  entrypoint c_creator() : address =
    Contract.creator

  entrypoint is_payable(a : address) : bool =
    Address.is_payable(a)