vaa_verify.teal

#pragma version 6
txn RekeyTo
global ZeroAddress
==
assert
txn Fee
int 0
==
assert
txn TypeEnum
int appl
==
assert
txna ApplicationArgs 1
txna ApplicationArgs 3
txna ApplicationArgs 2
callsub sigcheck_0
assert
int 1
return

// sig_check
sigcheck_0:
store 2
store 1
store 0
byte ""
store 240
byte ""
store 241
load 0
len
store 5
int 0
store 3
int 0
store 4
sigcheck_0_l1:
load 3
load 5
<
bz sigcheck_0_l3
load 1
load 0
load 3
int 65
+
int 1
extract3
btoi
load 0
load 3
int 1
+
int 32
extract3
load 0
load 3
int 33
+
int 32
extract3
ecdsa_pk_recover Secp256k1
store 241
store 240
load 2
load 4
int 20
extract3
load 240
load 241
concat
keccak256
extract 12 20
==
assert
load 3
int 66
+
store 3
load 4
int 20
+
store 4
b sigcheck_0_l1
sigcheck_0_l3:
int 1
retsub