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(** This module defines identifiers for two basic types of contracts. It also
    specifies how to compute originated contract's hash from origination
    nonce. *)

(** A contract is simply an account on the blockchain ledger. There are two
    types of contracts:
    - implicit contracts represent accounts of users of the blockchain;
    - originated are special accounts with a Michelson script attached to
    them. Every time a transaction is sent to an originated account, its
    associated script is run in order to trigger some action in response.

    An implicit account is identified by the hash of the public key which was
    used to create it. The owner of the corresponding private key is the
    holder of the account. An originated contract's hash is derived from its
    origination nonce (see below). *)
type t = private
  | Implicit of Signature.Public_key_hash.t
  | Originated of Contract_hash.t

type contract = t

include Compare.S with type t := contract

val public_key_hash_in_memory_size : Cache_memory_helpers.sint

val in_memory_size : t -> Cache_memory_helpers.sint

(** {2 Implicit contracts} *)

val implicit_contract : Signature.Public_key_hash.t -> contract

val is_implicit : contract -> Signature.Public_key_hash.t option

(** {2 Originated contracts} *)

(** Originated contracts handles are crafted from the hash of the
    operation that triggered their origination (and nothing else).
    As a single operation can trigger several originations, the
    corresponding handles are forged from a deterministic sequence of
    nonces, initialized with the hash of the operation. *)
type origination_nonce

val originated_contract : origination_nonce -> contract

val originated_contracts :
  since:origination_nonce -> until:origination_nonce -> contract list

val initial_origination_nonce : Operation_hash.t -> origination_nonce

val incr_origination_nonce : origination_nonce -> origination_nonce

val is_originated : contract -> Contract_hash.t option

(** {2 Human readable notation} *)

type error += Invalid_contract_notation of string (* `Permanent *)

val to_b58check : contract -> string

val of_b58check : string -> contract tzresult

val pp : Format.formatter -> contract -> unit

val pp_short : Format.formatter -> contract -> unit

(** {2 Serializers} *)

val encoding : contract Data_encoding.t

val origination_nonce_encoding : origination_nonce Data_encoding.t

val rpc_arg : contract RPC_arg.arg

module Index : Storage_description.INDEX with type t = t