(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
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(* Software is furnished to do so, subject to the following conditions:      *)
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(* DEALINGS IN THE SOFTWARE.                                                 *)
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(** [exists ctxt bpkh] returns true iff [bpkh] is associated to a non null
    commitment. *)
val exists : Raw_context.t -> Blinded_public_key_hash.t -> bool Lwt.t

(** [committed_amount ctxt bpkh] return the commitment associated to [bpkh], or
    [Tez_repr.zero] if [bpkh] has no associated commitment. *)
val committed_amount :
  Raw_context.t -> Blinded_public_key_hash.t -> Tez_repr.t tzresult Lwt.t

val increase_commitment_only_call_from_token :
  Raw_context.t ->
  Blinded_public_key_hash.t ->
  Tez_repr.t ->
  Raw_context.t tzresult Lwt.t

val decrease_commitment_only_call_from_token :
  Raw_context.t ->
  Blinded_public_key_hash.t ->
  Tez_repr.t ->
  Raw_context.t tzresult Lwt.t