diff --git a/src/api.ml b/src/api.ml
index ab10f1e8..7a9a732f 100644
--- a/src/api.ml
+++ b/src/api.ml
@@ -54,15 +54,16 @@ module Account_operation = struct
     |> Jsont.enum ~kind:"account operation type"
 end
 
-module B32 = struct
-  include B32
+module Crockford = struct
+  include Crockford
 
-  let jsont = Jsont.of_of_string ~kind:"B32" B32.decode ~enc:B32.encode
+  let jsont =
+    Jsont.of_of_string ~kind:"Crockford" Crockford.decode ~enc:Crockford.encode
 
   let caqti =
     Caqti_type.custom
-      ~encode:(fun v -> Ok (B32.encode v))
-      ~decode:B32.decode Caqti_type.string
+      ~encode:(fun v -> Ok (Crockford.encode v))
+      ~decode:Crockford.decode Caqti_type.string
 end
 
 module ErrorDetail = struct
diff --git a/src/config_parser.ml b/src/config_parser.ml
index 35289f71..66d6e435 100644
--- a/src/config_parser.ml
+++ b/src/config_parser.ml
@@ -209,4 +209,4 @@ let rsa_keysize s =
     (* because of [kdf_mod_n] *)
     failure "RSA keysize must be multiple of 8, found `%d`" nbits
 
-let ed25519 s = Eddsa.pub_of_b32 s |> unwrap_or_failure
+let ed25519 s = Eddsa.pub_of_crockford s |> unwrap_or_failure
diff --git a/src/b32.ml b/src/crockford.ml
similarity index 100%
rename from src/b32.ml
rename to src/crockford.ml
diff --git a/src/dune b/src/dune
index 9b723b01..9ceb5f38 100644
--- a/src/dune
+++ b/src/dune
@@ -65,7 +65,7 @@
   signatures
   api)
  (libraries
-  (re_export b32)
+  (re_export crockford)
   (re_export taler_signature_purpose_codes)
   ;
   angstrom
@@ -89,9 +89,9 @@
   ;
   ))
 
-(library ; crockford base32
- (name b32)
- (modules b32)
+(library
+ (name crockford)
+ (modules crockford)
  (libraries base32))
 
 (rule
diff --git a/src/eddsa.ml b/src/eddsa.ml
index 89bd5f19..89c98028 100644
--- a/src/eddsa.ml
+++ b/src/eddsa.ml
@@ -25,14 +25,15 @@ module Priv = struct
     Mirage_eddsa.priv_of_octets o
     |> Result.map_error (Fmt.str "%a" pp_mirage_error)
 
-  let priv_to_b32 t = priv_to_octets t |> B32.encode
+  let priv_to_crockford t = priv_to_octets t |> Crockford.encode
 
-  let priv_of_b32 s =
-    let* octets = B32.decode s in
+  let priv_of_crockford s =
+    let* octets = Crockford.decode s in
     priv_of_octets octets
 
   let priv_jsont =
-    Jsont.of_of_string ~kind:"EddsaPrivateKey" priv_of_b32 ~enc:priv_to_b32
+    Jsont.of_of_string ~kind:"EddsaPrivateKey" priv_of_crockford
+      ~enc:priv_to_crockford
 
   let priv_bin =
     let priv_of_octets_exn t =
@@ -48,14 +49,15 @@ module Pub = struct
     Mirage_eddsa.pub_of_octets t
     |> Result.map_error (Fmt.str "%a" pp_mirage_error)
 
-  let pub_to_b32 t = pub_to_octets t |> B32.encode
+  let pub_to_crockford t = pub_to_octets t |> Crockford.encode
 
-  let pub_of_b32 s =
-    let* octets = B32.decode s in
+  let pub_of_crockford s =
+    let* octets = Crockford.decode s in
     pub_of_octets octets
 
   let pub_jsont =
-    Jsont.of_of_string ~kind:"EddsaPublicKey" pub_of_b32 ~enc:pub_to_b32
+    Jsont.of_of_string ~kind:"EddsaPublicKey" pub_of_crockford
+      ~enc:pub_to_crockford
 
   let pub_bin =
     let pub_of_octets_exn t =
@@ -77,14 +79,15 @@ module Sig_ = struct
     | false -> Error "invalid eddsa signature length"
     | true -> Ok (S s)
 
-  let sig_of_b32 s =
-    let* s = B32.decode s in
+  let sig_of_crockford s =
+    let* s = Crockford.decode s in
     sig_of_octets s
 
-  let sig_to_b32 (S s) = B32.encode s
+  let sig_to_crockford (S s) = Crockford.encode s
 
   let sig_jsont =
-    Jsont.of_of_string ~kind:"EddsaSignature" sig_of_b32 ~enc:sig_to_b32
+    Jsont.of_of_string ~kind:"EddsaSignature" sig_of_crockford
+      ~enc:sig_to_crockford
 
   let sig_bin =
     let sig_of_octets_exn t =
@@ -102,4 +105,4 @@ include Priv
 include Pub
 include Sig_
 
-let pp_pub ppf pub = Fmt.pf ppf "%s" (pub_to_b32 pub)
+let pp_pub ppf pub = Fmt.pf ppf "%s" (pub_to_crockford pub)
diff --git a/src/hash.ml b/src/hash.ml
index aed0b3e7..6dd5c1b2 100644
--- a/src/hash.ml
+++ b/src/hash.ml
@@ -5,8 +5,8 @@ module type S = sig
 
   val hash : string -> t
   val to_octets : t -> string
-  val to_b32 : t -> B32.t
-  val of_b32 : B32.t -> (t, string) result
+  val to_crockford : t -> Crockford.t
+  val of_crockford : Crockford.t -> (t, string) result
   val pp_hex : Format.formatter -> t -> unit
   val pp : Format.formatter -> t -> unit
   val bin : t Bin.t
@@ -25,14 +25,14 @@ module MK (H : Digestif.S) : S = struct
     | Some t -> Ok t
 
   let to_octets = H.to_raw_string
-  let to_b32 t = B32.encode (to_octets t)
+  let to_crockford t = Crockford.encode (to_octets t)
 
-  let of_b32 s =
-    let* o = B32.decode s in
+  let of_crockford s =
+    let* o = Crockford.decode s in
     of_octets o
 
   let pp_hex = H.pp
-  let pp ppf t = Fmt.pf ppf "%s" (to_b32 t)
+  let pp ppf t = Fmt.pf ppf "%s" (to_crockford t)
 
   let bin =
     let of_octets_exn s =
@@ -45,7 +45,7 @@ module MK (H : Digestif.S) : S = struct
     let open Caqti_type in
     custom ~encode:(fun v -> Ok (to_octets v)) ~decode:of_octets octets
 
-  let jsont = Jsont.of_of_string ~kind:"hash" of_b32 ~enc:to_b32
+  let jsont = Jsont.of_of_string ~kind:"hash" of_crockford ~enc:to_crockford
 end
 
 module H32 = MK (Digestif.SHA256)
diff --git a/src/mte_management.ml b/src/mte_management.ml
index d1bcc64d..587399ac 100644
--- a/src/mte_management.ml
+++ b/src/mte_management.ml
@@ -63,7 +63,8 @@ module Denom_revoke = struct
     @@
     let keys = Vifu.Server.device Mte_device.keys server in
     let* h_denom_pub =
-      DenominationHash.of_b32 h_denom_pub |> Result.map_error (fun e -> `Msg e)
+      DenominationHash.of_crockford h_denom_pub
+      |> Result.map_error (fun e -> `Msg e)
     in
     let* v = request_of_json req in
     let* () = verify keys h_denom_pub v in
@@ -90,7 +91,7 @@ module Signkey_revoke = struct
     @@
     let keys = Vifu.Server.device Mte_device.keys server in
     let* exchange_pub =
-      Eddsa.pub_of_b32 exchange_pub |> Result.map_error (fun e -> `Msg e)
+      Eddsa.pub_of_crockford exchange_pub |> Result.map_error (fun e -> `Msg e)
     in
     let* v = request_of_json req in
     let* () = verify keys exchange_pub v in
@@ -186,7 +187,7 @@ module Auditors_disable = struct
     let keys = Vifu.Server.device Mte_device.keys server in
     let db_conn = Vifu.Server.device Mte_device.db_conn server in
     let* auditor_pub =
-      Eddsa.pub_of_b32 auditor_pub |> Result.map_error (fun e -> `Msg e)
+      Eddsa.pub_of_crockford auditor_pub |> Result.map_error (fun e -> `Msg e)
     in
     let* v = request_of_json req in
     let* () = verify keys auditor_pub v in
diff --git a/src/rsa.ml b/src/rsa.ml
index bc3555e8..9d80584d 100644
--- a/src/rsa.ml
+++ b/src/rsa.ml
@@ -90,23 +90,24 @@ module Priv = struct
   let priv_of_octets = RSA_BIN.priv_of_octets
   let priv_to_octets = RSA_BIN.priv_to_octets
 
-  let priv_of_b32 s =
-    let* s = B32.decode s in
+  let priv_of_crockford s =
+    let* s = Crockford.decode s in
     priv_of_octets s
 
-  let priv_to_b32 t = B32.encode (priv_to_octets t)
+  let priv_to_crockford t = Crockford.encode (priv_to_octets t)
 
   let priv_jsont =
-    Jsont.of_of_string ~kind:"RsaPrivateKey" priv_of_b32 ~enc:priv_to_b32
+    Jsont.of_of_string ~kind:"RsaPrivateKey" priv_of_crockford
+      ~enc:priv_to_crockford
 end
 
 module Pub = struct
   let pub_to_octets = RSA_BIN.pub_to_octets
   let pub_of_octets = RSA_BIN.pub_of_octets
-  let pub_to_b32 t = B32.encode (pub_to_octets t)
+  let pub_to_crockford t = Crockford.encode (pub_to_octets t)
 
-  let pub_of_b32 s =
-    let* s = B32.decode s in
+  let pub_of_crockford s =
+    let* s = Crockford.decode s in
     pub_of_octets s
 
   let pub_caqti =
@@ -115,14 +116,15 @@ module Pub = struct
       ~decode:pub_of_octets Caqti_type.octets
 
   let pub_jsont =
-    Jsont.of_of_string ~kind:"RsaPublicKey" pub_of_b32 ~enc:pub_to_b32
+    Jsont.of_of_string ~kind:"RsaPublicKey" pub_of_crockford
+      ~enc:pub_to_crockford
 end
 
 include Priv
 include Pub
 
 let sig_jsont =
-  Jsont.of_of_string ~kind:"RsaSignature" B32.decode ~enc:B32.encode
+  Jsont.of_of_string ~kind:"RsaSignature" Crockford.decode ~enc:Crockford.encode
 
 (* ---- *)
 
@@ -208,4 +210,4 @@ let sign ~key bmsg : sig_ =
   let sig_ = Mirage_rsa.decrypt ~crt_hardening:true ~key bmsg in
   S sig_
 
-let pp_pub ppf pub = Fmt.pf ppf "%s" (pub_to_b32 pub)
+let pp_pub ppf pub = Fmt.pf ppf "%s" (pub_to_crockford pub)
diff --git a/src/secmod_eddsa.ml b/src/secmod_eddsa.ml
index 60c3124b..c48a97ee 100644
--- a/src/secmod_eddsa.ml
+++ b/src/secmod_eddsa.ml
@@ -60,7 +60,7 @@ let write_eddsa fs spath priv =
   Fat.write fs spath data
 
 let key_spath k =
-  let sfn = String.sub (Eddsa.pub_to_b32 k.pub) 0 8 in
+  let sfn = String.sub (Eddsa.pub_to_crockford k.pub) 0 8 in
   Fat.Path.add Cfg.key_dir sfn
 
 let read_key fs spath =
diff --git a/src/secmod_rsa.ml b/src/secmod_rsa.ml
index 491b0619..31e75a75 100644
--- a/src/secmod_rsa.ml
+++ b/src/secmod_rsa.ml
@@ -48,9 +48,9 @@ let find_exn h_pub section_name =
      rsa keysize is not known and then we have to escape '\x00' *)
 let rsa_private_key_bin =
   let decode_exn o =
-    Rsa.priv_of_b32 o |> function Error e -> invalid_arg e | Ok v -> v
+    Rsa.priv_of_crockford o |> function Error e -> invalid_arg e | Ok v -> v
   in
-  let encode o = Rsa.priv_to_b32 o in
+  let encode o = Rsa.priv_to_crockford o in
   Bin.map Bin.cstring decode_exn encode
 
 let key_bin =
@@ -67,7 +67,7 @@ let key_bin =
   |> sealr
 
 let key_spath k =
-  let sfn = String.sub (DenominationHash.to_b32 k.h_pub) 0 8 in
+  let sfn = String.sub (DenominationHash.to_crockford k.h_pub) 0 8 in
   Fat.Path.add Cfg.key_dir sfn
 
 let read_eddsa fs spath =
diff --git a/src/signatures.ml b/src/signatures.ml
index ba45d7cc..bd794052 100644
--- a/src/signatures.ml
+++ b/src/signatures.ml
@@ -72,8 +72,8 @@ module Bytes32 : BYTES = struct
     | true -> Ok s
 
   let jsont =
-    let decode s = Result.bind (B32.decode s) of_octets in
-    let encode b = to_octets b |> B32.encode in
+    let decode s = Result.bind (Crockford.decode s) of_octets in
+    let encode b = to_octets b |> Crockford.encode in
     Jsont.of_of_string ~kind:"Bytes32" decode ~enc:encode
 
   let caqti =
@@ -101,8 +101,8 @@ module Bytes64 : BYTES = struct
     | true -> Ok s
 
   let jsont =
-    let decode s = Result.bind (B32.decode s) of_octets in
-    let encode b = to_octets b |> B32.encode in
+    let decode s = Result.bind (Crockford.decode s) of_octets in
+    let encode b = to_octets b |> Crockford.encode in
     Jsont.of_of_string ~kind:"Bytes64" decode ~enc:encode
 
   let caqti =
diff --git a/test/test.ml b/test/test.ml
index 48ca4720..a9e11ab0 100644
--- a/test/test.ml
+++ b/test/test.ml
@@ -1,6 +1,6 @@
 let get_ok = Result.get_ok
-let encode = B32.encode
-let decode s = B32.decode s |> get_ok
+let encode = Crockford.encode
+let decode s = Crockford.decode s |> get_ok
 
 let test_b32 () =
   let round_trip s =
@@ -84,7 +84,7 @@ module Test_crypto = struct
       |> Eddsa.priv_of_octets
       |> get_ok
       |> Eddsa.pub_of_priv
-      |> Eddsa.pub_to_b32
+      |> Eddsa.pub_to_crockford
     in
     assert (pub = pub')
 
@@ -139,8 +139,8 @@ module Test_crypto = struct
     let blinded_message =
       "3KHKZJZ30ABB4E56MA2V0EQWGCWH0QQG9P2ZHYHR186C5HZXJMM4N9WXAQTKS94QSV9Y17GGNXN5MB1PZZFG7Q0FY88QPKKRG4MYCPSMTZK5W59R0MJVNJ4P4AQM96TDG5W7RV8GSNR1QQZ1GNHW3CX6D6ZRTMXB2NKB5SSYTDJS79F5ZFBRZ4HVED9JBBPWSR79KVV5QQ4APBGHBCKGMF9NJJS53A1BVYHDEVYAGFYF2SNEP827ZP50FKJ5GKGV8NQ15ESEZ69AT7GJG0T3TZVENY2YN9CVR98W3BKEZ53J7VTANARG8SJS8AMJQ7S23P5HRJ7XE9KTNRNXKH49MXV9JHHYE5535N7AGWEKR47SBCGNF44Z7XJ9RV5BQV12ZRJKN4HBZQHDNCMH3QKX9Z6G64"
     in
-    let pub = rsa_public_key |> Rsa.pub_of_b32 |> get_ok in
-    assert (Rsa.pub_to_b32 pub = rsa_public_key);
+    let pub = rsa_public_key |> Rsa.pub_of_crockford |> get_ok in
+    assert (Rsa.pub_to_crockford pub = rsa_public_key);
     let bks = blinding_key_secret |> decode in
     let msg = decode message_hash in
     let bmsg = Rsa.blind_msg pub ~bks msg |> encode in
@@ -169,10 +169,10 @@ module Test_crypto = struct
     in
     let h_pub' =
       rsa_pub
-      |> Rsa.pub_of_b32
+      |> Rsa.pub_of_crockford
       |> get_ok
       |> DenominationHash.hash
-      |> DenominationHash.to_b32
+      |> DenominationHash.to_crockford
     in
     assert (h_pub' = h_pub)
 end
diff --git a/tools/offline.ml b/tools/offline.ml
index a71328e5..d4cf4bd0 100644
--- a/tools/offline.ml
+++ b/tools/offline.ml
@@ -47,25 +47,26 @@ module Arg = struct
     Arg.Conv.make ~docv:"amount argument" ~parser:Amount.of_string ~pp:Amount.pp
       ()
 
-  let b32 =
-    let pp fmt v = Fmt.pf fmt "%s" (B32.encode v) in
-    Arg.Conv.make ~docv:"Crockford's Base32 encoded argument" ~parser:B32.decode
-      ~pp ()
+  let crockford =
+    let pp fmt v = Fmt.pf fmt "%s" (Crockford.encode v) in
+    Arg.Conv.make ~docv:"Crockford's Base32 encoded argument"
+      ~parser:Crockford.decode ~pp ()
 
   let eddsa_pub =
     let pp fmt key =
-      let s = Eddsa.pub_to_b32 key in
+      let s = Eddsa.pub_to_crockford key in
       Fmt.pf fmt "%s" s
     in
-    Arg.Conv.make ~docv:"eddsa public key argument" ~parser:Eddsa.pub_of_b32 ~pp
-      ()
+    Arg.Conv.make ~docv:"eddsa public key argument"
+      ~parser:Eddsa.pub_of_crockford ~pp ()
 
   let rsa_pub =
     let pp fmt key =
-      let s = Rsa.pub_to_b32 key in
+      let s = Rsa.pub_to_crockford key in
       Fmt.pf fmt "%s" s
     in
-    Arg.Conv.make ~docv:"rsa public key argument" ~parser:Rsa.pub_of_b32 ~pp ()
+    Arg.Conv.make ~docv:"rsa public key argument" ~parser:Rsa.pub_of_crockford
+      ~pp ()
 end
 
 let master_key =
@@ -310,7 +311,7 @@ let drain_cmd =
   let credit_payto_uri =
     Arg.(required & opt (some string) None & info [ "credit_payto_uri" ])
   in
-  let wtid = Arg.(required & opt (some b32) None & info [ "wtid" ]) in
+  let wtid = Arg.(required & opt (some crockford) None & info [ "wtid" ]) in
   let date = Arg.(required & opt (some timestamp) None & info [ "date" ]) in
   let amount = Arg.(required & opt (some amount) None & info [ "amount" ]) in
   Cmd.make (Cmd.info "drain" ~doc)
diff --git a/tools/offline_impl.ml b/tools/offline_impl.ml
index 5773dac6..5f42ed1f 100644
--- a/tools/offline_impl.ml
+++ b/tools/offline_impl.ml
@@ -202,7 +202,9 @@ let setup ~output ~output_pubkey =
   @@
   let priv, pub = Mirage_crypto_ec.Ed25519.generate () in
   let priv_data = Mirage_crypto_ec.Ed25519.priv_to_octets priv in
-  let pub_data = Mirage_crypto_ec.Ed25519.pub_to_octets pub |> B32.encode in
+  let pub_data =
+    Mirage_crypto_ec.Ed25519.pub_to_octets pub |> Crockford.encode
+  in
   let* () = write_file output priv_data in
   let* () = write_file output_pubkey pub_data in
   Ok ()
@@ -223,7 +225,7 @@ let revoke_denom ~output ~master_key ~h_denom =
   @@
   let* key = read_master_key_file master_key in
   let* h_denom_pub =
-    DenominationHash.of_b32 h_denom |> Result.map_error (fun e -> `Msg e)
+    DenominationHash.of_crockford h_denom |> Result.map_error (fun e -> `Msg e)
   in
   let denom_revoke =
     let master_sig =