Using pybitcointools to validate tx_valid.json test vectors

I'm using this fork of the pybitcointools library and am trying to use the Bitcoincore JSON test vectors for unittesting.

Can someone advise:

1. How ECDSA is used to verify transactions..?
2. Ideally, how pybitcointools can be used do #1

From tx_valid.json, the first test vector is:

Code:

[
["The following are deserialized transactions which are valid."],
["They are in the form"],
["[[[prevout hash, prevout index, prevout scriptPubKey], [input 2], ...],"],
["serializedTransaction, enforceP2SH]"],
["Objects that are only a single string (like this one) are ignored"],

["The following is 23b397edccd3740a74adb603c9756370fafcde9bcc4483eb271ecad09a94dd63"],
["It is of particular interest because it contains an invalidly-encoded signature which OpenSSL accepts"],
["See http://r6.ca/blog/20111119T211504Z.html"],
["It is also the first OP_CHECKMULTISIG transaction in standard form"],
[[["60a20bd93aa49ab4b28d514ec10b06e1829ce6818ec06cd3aabd013ebcdc4bb1", 0, "1 0x41 0x04cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaff7d8a473e7e2e6d317b87bafe8bde97e3cf8f065dec022b51d11fcdd0d348ac4 0x41 0x0461cbdcc5409fb4b4d42b51d33381354d80e550078cb532a34bfa2fcfdeb7d76519aecc62770f5b0e4ef8551946d8a540911abe3e7854a26f39f58b25c15342af 2 OP_CHECKMULTISIG"]],
"0100000001b14bdcbc3e01bdaad36cc08e81e69c82e1060bc14e518db2b49aa43ad90ba26000000000490047304402203f16c6f40162ab686621ef3000b04e75418a0c0cb2d8aebeac894ae360ac1e780220ddc15ecdfc3507ac48e1681a33eb60996631bf6bf5bc0a0682c4db743ce7ca2b01ffffffff0140420f00000000001976a914660d4ef3a743e3e696ad990364e555c271ad504b88ac00000000", true]

Now, we have the following:

Code:

# inputs
ins = ["%s:%d" % ("60a20bd93aa49ab4b28d514ec10b06e1829ce6818ec06cd3aabd013ebcdc4bb1", 0)] # ins = ["prevout hash:prevout index"]

# scriptPubKey of inputs
scriptPubKey = '514104cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaff7d8a473e7e2e6d317b87bafe8bde97e3cf8f065dec022b51d11fcdd0d348ac4410461cbdcc5409fb4b4d42b51d33381354d80e550078cb532a34bfa2fcfdeb7d76519aecc62770f5b0e4ef8551946d8a540911abe3e7854a26f39f58b25c15342af52ae'

outs = [{'value': 1000000, 'script': '76a914660d4ef3a743e3e696ad990364e555c271ad504b88ac'}]
raw = mktx(ins, outs)
# "0100000001b14bdcbc3e01bdaad36cc08e81e69c82e1060bc14e518db2b49aa43ad90ba2600000000000ffffffff0140420f00000000001976a914660d4ef3a743e3e696ad990364e555c271ad504b88ac00000000"

# from test_vector ()or fetching the Tx: 23b397edccd3740a74adb603c9756370fafcde9bcc4483eb271ecad09a94dd63:0)
signed = "0100000001b14bdcbc3e01bdaad36cc08e81e69c82e1060bc14e518db2b49aa43ad90ba26000000000490047304402203f16c6f40162ab686621ef3000b04e75418a0c0cb2d8aebeac894ae360ac1e780220ddc15ecdfc3507ac48e1681a33eb60996631bf6bf5bc0a0682c4db743ce7ca2b01ffffffff0140420f00000000001976a914660d4ef3a743e3e696ad990364e555c271ad504b88ac00000000"

der_sig = "0048304402203f16c6f40162ab686621ef3000b04e75418a0c0cb2d8aebeac894ae360ac1e780220ddc15ecdfc3507ac48e1681a33eb60996631bf6bf5bc0a0682c4db743ce7ca2bab01" # NOTE: this signature is not canonical because both the r and s values have the highest bit set (ie ideally r and s should be padded with nullbytes)

So given all the information from the test vectors, how does one verify the signature against the raw transaction?

(NB. I'm doing this as a means to learn the way Bitcoin signs/verifies transactions. So far I've had no issue with these unittests)