Getting the ECDSA Z Value from a Bitcoin Single Input Transaction

In this video I demonstrate getting the ECDSA Z value from a bitcoin transaction with only one input. I also show the R and S values.
The ECDSA R, S and Z values are used throughout the many layers of bitcoin to validate a transaction, The Z value is also sometimes referred to as the signed message. Transactions that don't contain valid inputs can be safely ignored, and the Z value is one of the properties that is used to check validity.
This video shows me dissecting a very basic transaction with only 1 input and 1 output.
The urls I show in this video are
https://2coin.org/index.html?txid=bf474b96908ba7769120b2e8f2bfcbd2deca80c99b576b4b63bf18fb69e3d242
https://en.bitcoin.it/wiki/Protocol_documentation#tx
https://2coin.org/doublesha256.html