diff --git a/PSBT.md b/PSBT.md
index 93e586661..642011dab 100644
--- a/PSBT.md
+++ b/PSBT.md
@@ -22,7 +22,7 @@ bitcoin-cli -rpcuser=__cookie__ -rpcpassword=9e0ca21c70d6b7307b750c8012d12df04ef
 =btc -build-file %/lib/btc/hoon
 =psbt 'cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA'
 
-(parse:^psbt:btc psbt)
+(parse:pbt:btc psbt)
 ```
 
 ## Make an HD Path
@@ -53,7 +53,7 @@ Maps:
   - Non Witness TX: 82 byte input tx
   - Wallet Derivation path. 
     * Key: {0x6}|{33byte pubkey}
-    * Val: {4byte master xpub fingerprint}|{17byte HD path**
+    * Val: {4byte master xpub fingerprint}|{17byte HD path}
 3. skips the main output for some reason, even though it's in raw tx hex. 
 *skips* = double separator, I think
 **we can skip an ouput if the path is on someone else's ship**
diff --git a/WALLET.scratch.md b/WALLET.scratch.md
index c64571e23..9531cca3e 100644
--- a/WALLET.scratch.md
+++ b/WALLET.scratch.md
@@ -3,6 +3,7 @@
 ## xpub
 xpub1 is from mnemonic from PRIVATE.scratch
 ```
+=bl -build-file %/lib/btc-wallet-store/hoon
 =xpub1 'zpub6r8dKyWJ31XF6n69KKeEwLjVC5ruqAbiJ4QCqLsrV36Mvx9WEjUaiPNPGFLHNCCqgCdy6iZC8ZgHsm6a1AUTVBMVbKGemNcWFcwBGSjJKbD'
 =xpub2 'xpub6D7yaZieZEeG617UcKXDhbsDeso6bmxSAiGWkvkASoiwcjaRtrH5HeNRnDT25s7zmxYzj6MtFe32dVqcf9YcBKKgn9THHjwn2uSjkvobK4e'
 =bl -build-file %/lib/btc-wallet-store/hoon
diff --git a/app/btc-wallet-store.hoon b/app/btc-wallet-store.hoon
index 86e52d6b9..e93961526 100644
--- a/app/btc-wallet-store.hoon
+++ b/app/btc-wallet-store.hoon
@@ -156,7 +156,8 @@
       [~[(send-update [%generate-txbu xpub.act u.tb])] state]
     =/  [addr=address:btc =idx w=walt]
       ~(nixt-address wad u.uw %1)
-    =+  new-txbu=(~(add-output txb u.tb) addr u.chng `[fprint.w bipt.w %1 idx])
+    =/  new-txbu=txbu
+      (~(add-output txb u.tb) addr u.chng `(~(hdkey wad w %1) idx))
     :_  state(walts (~(put by walts) xpub.act w))
     :~  (send-update [%generate-txbu xpub.act new-txbu])
         %+  send-request  ~[requests-path]
diff --git a/lib/btc-wallet-store.hoon b/lib/btc-wallet-store.hoon
index 058b5996a..a0150f1ab 100644
--- a/lib/btc-wallet-store.hoon
+++ b/lib/btc-wallet-store.hoon
@@ -74,6 +74,11 @@
       pub:(derive-public:(derive-public:wilt.w (@ chyg)) idx)
     [(met 3 pk) pk]
   ::
+  ++  hdkey
+    |=  =idx:btc
+    ^-  hdkey:btc
+    [fprint.w (~(pubkey wad w chyg) idx) bipt.w chyg idx]
+  ::
   ++  mk-address
     |=  =idx:btc
     ^-  address:btc
@@ -241,7 +246,8 @@
           payee
           (total-vbytes is)
           %+  turn  is
-          |=(i=input [utxo.i ~ [fprint.w bipt.w chyg.i idx.i]])
+            |=  i=input
+            [utxo.i ~ (~(hdkey wad w chyg.i) idx.i)]
           txos
       ==
     --
diff --git a/lib/btc.hoon b/lib/btc.hoon
index 62023ad07..736a47f3e 100644
--- a/lib/btc.hoon
+++ b/lib/btc.hoon
@@ -62,25 +62,44 @@
     ++  globals
       |=  =rawtx
       ^-  map:psbt
-      *map:psbt
-    ++  inputs
-      |=  (list in:psbt)
+      :~  [[1 0x0] rawtx]
+      ==
+    ::
+    ++  input
+      |=   i=in:psbt
       ^-  map:psbt
-      *map:psbt
-    ++  outputs
-      |=  (list out:psbt)
+      :~  [[1 0x0] rawtx.i]
+          (witness-tx i)
+          (hdkey %input hdkey.i)
+      ==
+    ::
+    ++  output
+      |=  =out:psbt
       ^-  map:psbt
-      *map:psbt
-    --
+      ?~  hk.out  ~
+      :~  (hdkey %output u.hk.out)
+      ==
+    ::
+    ++  witness-tx
+      |=  i=in:psbt
+      ^-  keyval:psbt
+      :-  [1 0x1]
+      %-  cat:byt
+      :~  (flip:byt 4^value.utxo.i)
+          1^0x16
+          2^0x14
+          (hash-160 dat.pubkey.hdkey.i)
+      ==
+    ::
     ++  hdkey
-      |=  [pubkey=bytc =target:psbt h=^hdkey]
+      |=  [=target:psbt h=^hdkey]
       ^-  keyval:psbt
       =/  typ=@ux
         ?-  target
           %input   0x6
           %output  0x2
         ==
-      :-  (cat:byt ~[1^typ pubkey])
+      :-  (cat:byt ~[1^typ pubkey.h])
       %-  cat:byt
       :~  fprint.h
           %-  to-byts:buf
@@ -91,11 +110,14 @@
             ==
           (flip:byt [(met 3 idx.h) idx.h])
       ==
+    --
   ::  +encode: make base64 cord of PSBT
   ::
   ++  encode
-  |=  [=rawtx =txid inputs=(list in:psbt) outputs=(list out:psbt)]
-  ^-  cord
+    |=  [=rawtx =txid inputs=(list in:psbt) outputs=(list out:psbt)]
+    ^-  cord
+::    (globals rawtx)
+    
   :: TODO
   ::  make global map
   ::  raw tx hex
@@ -104,18 +126,6 @@
   ::  parse to hex
   ::  encode as base64!
   *cord
-  ::  +create: make base64 cord of PSBT
-  ::
-  ++  create
-    |=  [=rawtx =txid inputs=(list in:psbt) outputs=(list out:psbt)]
-    ^-  cord
-    :: TODO
-    ::  make global map
-    :: turn each input and output into a map (or ~)
-    ::  put the 0x0 separator between all
-    ::  parse to hex
-    ::  encode as base64!
-    *cord
   ::
   ++  parse
     |=  psbt-base64=cord
diff --git a/sur/btc.hoon b/sur/btc.hoon
index 4bbbffe83..a049592c5 100644
--- a/sur/btc.hoon
+++ b/sur/btc.hoon
@@ -10,7 +10,7 @@
 +$  bipt  $?(%44 %49 %84)
 +$  chyg  $?(%0 %1)
 +$  idx   @ud
-+$  hdkey  [=fprint =bipt =chyg =idx] 
++$  hdkey  [=fprint pubkey=bytc =bipt =chyg =idx]
 +$  sats  @ud
 +$  vbytes  @ud
 +$  bytc  [wid=@ dat=@ux]
@@ -20,7 +20,7 @@
 +$  txid  hash256
 +$  rawtx  bytc
 +$  buffer  (list @ux)
-+$  utxo  [pos=@ =txid height=@ value=sats recvd=(unit @da)] 
++$  utxo  [pos=@ =txid height=@ value=sats recvd=(unit @da)]
 ++  address-info
   $:  =address
       confirmed-value=sats
@@ -61,7 +61,7 @@
   --
 ++  psbt
   |%
-  +$  in  [pubkey=bytc =utxo =rawtx =hdkey]
+  +$  in  [=utxo =rawtx =hdkey]
   +$  out  [=address hk=(unit hdkey)]
   +$  target  $?(%input %output)
   +$  keyval  [key=bytc val=bytc]