psbt skeleton

lib/btc.hoon

@@ -67,6 +67,34 @@
 ::
 ++  psbt
   |%
+  ++  en
+    |%
+    ++  globals
+      |=  =rawtx
+      ^-  map:^psbt
+      *map:^psbt
+    ++  inputs
+      |=  (list in:^psbt)
+      ^-  map:^psbt
+      *map:^psbt
+    ++  outputs
+      |=  (list out:^psbt)
+      ^-  map:^psbt
+      *map:^psbt
+    --
+  ::  +encode: make base64 cord of PSBT
+  ::
+  ++  encode
+  |=  [=rawtx =txid inputs=(list in:^psbt) outputs=(list out:^psbt)]
+  ^-  cord
+  :: TODO
+  ::  make global map
+  ::  raw tx hex
+  :: turn each input and output into a map (or ~)
+  ::  put the 0x0 separator between all
+  ::  parse to hex
+  ::  encode as base64!
+  *cord
   ::  +create: make base64 cord of PSBT
   ::
   ++  create