C# library. ScriptPubKey is the second half of a script (discussed later). sig pubKey OP_checksig Equality is checked between the top two stack items. I did not find any online tool, that you could use for that so I built a little software that will help you with. First he paid a lot of money for a lesson, then the instructor told the group go climb wall and went for a cup of coffee. It is one of many public blockchain explorers which can be used for viewing bitcoin payments and their details.
Signature is checked for top two stack items. If the input is worth 50 BTC but you only want to send 25 BTC, Bitcoin will create two outputs worth 25 BTC: one to the destination, and what's the lowest bitcoin sum you can send one back to you (known as " change though you send it to yourself). Generate your Bitcoin private key. The higher the fee, the faster your transaction confirms. There can be more than one output, and they share the combined value of the inputs.