For example this one?
TestNet TxId: ac919ea7cd1564fe0826851076041d58185b2ca04f2305f22dd60b63ac476913
According to BIP143:
https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki#p2sh-p2wpkhThat transaction's Z-value should be:
67927cd4db3a11cd954cf8903f65f1ddbd0e601cba1a3b74cf1136e53f509592
SHA2562x of (
remove breakspaces):
02000000
a8ea6358b5a2efe25e5b6813b5298c603666c90b3061eea0aed7108588ce6f52
18606b350cd8bf565266bc352f0caddcf01e8fa789dd8a15386327cf8cabe198
e977d313dd88253458ea455fd4a8256453acd7ad193b2c72ae376492ed338e1f01000000
1976a9148e6e804524d16ff27b51fa0b0e65463028ffd4b888ac
77cd300000000000
feffffff
8942f7fbf60d9102e812e3d720d2c0918f68b1dbb3cd7e76366ddf055e051f56
0a6a1800
01000000
But since we can't find a tool that supports SegWit, I can't cross-check if it's correct, so please CMIIAW.
I 'plugged in' the message to the usual signature check algorithm and it r's matched so the z-value quoted by nc50lc is correct.
I will go away and learn the BIP page. Thanks
Msg: 02000000a8ea6358b5a2efe25e5b6813b5298c603666c90b3061eea0aed7108588ce6f5218606b350cd8bf565266bc352f0caddcf01e8fa789dd8a15386327cf8cabe198e977d313dd88253458ea455fd4a8256453acd7ad193b2c72ae376492ed338e1f010000001976a9148e6e804524d16ff27b51fa0b0e65463028ffd4b888ac77cd300000000000feffffff8942f7fbf60d9102e812e3d720d2c0918f68b1dbb3cd7e76366ddf055e051f560a6a180001000000
Public key = b17450a1cabad6f734df66e4ea6a85882c8a14ce350733a20f83f2f10448803e 17a6393dfd1e448bc2d810100e0a4cef8966f92cd866ef7a4e759998a3bf6d2a
r = 0d8e8eaa6ecaa92eae1208b04fd6306f02bc66078fab46c9a60bfbf94a49ee18
s = 770a265fe229918c0d67b0bc73dc4408248939d2b261f2b6ea4b7c9c5bcd123c
z = 67927cd4db3a11cd954cf8903f65f1ddbd0e601cba1a3b74cf1136e53f509592
Result r = d8e8eaa6ecaa92eae1208b04fd6306f02bc66078fab46c9a60bfbf94a49ee18
Signature matches!