Good news! Radiator got some bug fixes. Nothing all that important, but I also did a bit of the groundwork needed to support transaction singing.
In this update:
Because of Dan's post, I have to say, that cleared up a bit of confusion on my part. It's not like I've been working on this since November, but every time I looked at the code examples, I just didn't know what to make of it. But now, I think I'm pretty much up to speed.
There's only one problem. I can't get it to work. And it's a problem that has been described before, I just need to research it a bit more.
The problem I'm having is, when I build a transaction and broadcast it, I get this message: tx_missing_posting_auth
I'm having trouble finding where my mistake is. I'm aware that if, for instance, you don't format the timestamp correctly, you might get this message. In fact, it seems like this is what you get when the node can't figure out what you're doing.
But I'm sure it's all on my end. And I'm sure it's simple.
If you want to take a stab at troubleshooting, I recommend starting here:
https://github.com/inertia186/radiator/blob/master/test/radiator/transaction_test.rb#L22
This test is supposed to mirror what 
https://steemit.com/steem/@xeroc/steem-transaction-signing-in-a-nutshell
It does so to the best of my ability, yet the message I get when I run it on a live console is tx_missing_posting_auth, like I mentioned.
Anyway, I'll keep troubleshooting.
UPDATE: Troubleshooting complete. Radiator is now able to sign transactions. I just need to make it aware of all operations because for testing purposes, it only supports vote. But here's an example of that:
require 'radiator'
transaction = Radiator::Transaction.new(wif: '5JLw5dgQAx6rhZEgNN5C2ds1V47RweGshynFSWFbaMohsYsBvE8')
vote = {
type: :vote,
voter: 'xeroc',
author: 'xeroc',
permlink: 'piston',
weight: 10000
}
operation = Radiator::Operation.new(vote)
transaction.operations << operation
transaction.process(true)
Related Links: