diff --git a/pkg/arvo/gen/tx.hoon b/pkg/arvo/gen/tx.hoon
index 5ce216bc18..a073af29ca 100644
--- a/pkg/arvo/gen/tx.hoon
+++ b/pkg/arvo/gen/tx.hoon
@@ -41,15 +41,15 @@
 |=  sig=(unit @t)
 ^-  @t
 =/  account  (hex-to-num:eth '0xb026b0AA6e686F2386051b31A03E5fB95513e1c0')
-=/  tx=octs  (set-spawn-proxy:l2:tt 0 ~ravmun-mitbus %ravmun %own account)
-=/  prep=octs  [(sub p.tx 65) (rsh 3^65 q.tx)]
-=/  nonced=octs  [(add p.prep 4) (can 3 4^1 prep ~)]
+=/  tx=octs
+  (take-ship-address:bits:l2:tt %set-spawn-proxy ~ravmun-mitbus %own account)
+=/  prepped=octs  (prepare-for-sig:tt 3 0 tx)
 ?~  sig
-  (cat 3 'sign: ' (print-for-web3 nonced))
+  (cat 3 'sign: ' (print-for-web3 prepped))
 =/  batch=@t
   %:  rap  3
     '0x26887f26'
-    (print-for-batch prep)
+    (print-for-batch tx)
     (rsh 3^2 u.sig)
     ~
   ==
diff --git a/pkg/arvo/lib/azimuth.hoon b/pkg/arvo/lib/azimuth.hoon
index 7046844ad1..96e9967ea1 100644
--- a/pkg/arvo/lib/azimuth.hoon
+++ b/pkg/arvo/lib/azimuth.hoon
@@ -136,7 +136,7 @@
       ::
       ++  launch  4.601.630
       ++  public  launch
-      ++  chain-id  1
+      ++  chain-id  3
       --
     ::
     ::  Local contract addresses
diff --git a/pkg/arvo/lib/naive.hoon b/pkg/arvo/lib/naive.hoon
index e75ee1f97c..010627eab4 100644
--- a/pkg/arvo/lib/naive.hoon
+++ b/pkg/arvo/lib/naive.hoon
@@ -125,10 +125,10 @@
 |%
 ::  ethereum address, 20 bytes.
 ::
-+$  address    @ux
-+$  nonce      @ud
-+$  dominion   ?(%l1 %l2 %spawn)
-+$  keys  [=life suite=@ud auth=@ crypt=@]
++$  address   @ux
++$  nonce     @ud
++$  dominion  ?(%l1 %l2 %spawn)
++$  keys      [=life suite=@ud auth=@ crypt=@]
 ++  point
   $:  ::  domain
       ::
@@ -206,7 +206,11 @@
   $%  [%bat batch=@]
       [%log =event-log]
   ==
-::  ECDSA verifier
+::  ECDSA verifier.
+::
+::  Must keccak `dat` and recover the ethereum address which signed.
+::  Must not crash.  `v` will normally be between 0 and 3; if it is not,
+::  should produce null.
 ::
 +$  verifier  $-([dat=octs v=@ r=@ s=@] (unit address))
 --  =>
@@ -333,7 +337,7 @@
   ^-  ?
   |^
   =/  point  (get-point state ship.from.tx.raw-tx)
-  ?>  ?=(^ point)  ::  we never parse more than four bytes
+  ?>  ?=(^ point)  ::  we never parse more than four bytes for a ship
   =/  need=[=address =nonce]
     ?-  proxy.from.tx.raw-tx
       %own       owner.own.u.point
@@ -708,7 +712,7 @@
         `net.point
       =/  =keys  [+(life.keys.net.point) 0 0 0]
       :-  :~  [%point ship %rift +(rift.net.point)]
-              [%point ship %keys keys]  ::  TODO: 0?
+              [%point ship %keys keys]
           ==
       [+(rift.net.point) keys sponsor.net.point escape.net.point]
     =/  effects-3
diff --git a/pkg/arvo/tests/lib/naive.hoon b/pkg/arvo/tests/lib/naive.hoon
index 593a35cfaf..27db42bf76 100644
--- a/pkg/arvo/tests/lib/naive.hoon
+++ b/pkg/arvo/tests/lib/naive.hoon
@@ -65,16 +65,7 @@
 ::
 ++  sign-tx
   |=  [pk=@ nonce=@ud tx=octs]  ^-  octs
-  =/  prepared-data=octs
-    =/  chain-t  (rsh [3 2] (scot %ui 1.337))
-    %:  cad:naive  3
-      14^'UrbitIDV1Chain'
-      (met 3 chain-t)^chain-t
-      1^':'
-      4^nonce
-      tx
-      ~
-    ==
+  =/  prepared-data  (prepare-for-sig 1.337 nonce tx)
   =/  sign-data
     =/  len  (rsh [3 2] (scot %ui p.prepared-data))
     %-  keccak-256:keccak:crypto
@@ -87,6 +78,19 @@
   =+  (ecdsa-raw-sign:secp256k1:secp:crypto sign-data pk)
   (cad:naive 3 1^v 32^s 32^r tx ~)
 ::
+++  prepare-for-sig
+  |=  [chain-id=@ud nonce=@ud tx=octs]
+  ^-  octs
+  =/  chain-t  (rsh [3 2] (scot %ui chain-id))
+  %:  cad:naive  3
+    14^'UrbitIDV1Chain'
+    (met 3 chain-t)^chain-t
+    1^':'
+    4^nonce
+    tx
+    ~
+  ==
+::
 ++  l1
   |%
   ::