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04:23 < m-schmoock> cdecker: https://github.com/lightningd/plugins/pull/63    nothing spectacular...
04:23 < m-schmoock> Btw, I will pickup my work on LN from next month, as I am looking forward to reduce my regular job to 3 days a week... :D
04:30 <@cdecker> Awesome, glad to have you back with us ^^
04:30 <@cdecker> How's the arm?
04:31 < m-schmoock> it healed really fine
04:31 < m-schmoock> no impediemtns :D
04:32 < m-schmoock> unfortunately I cant make it to the conference, I had already booked my holidays a few weeks before the date was set 
04:46 <@cdecker> Lucky you :-) I had my holidays booked and had to move them (but only 1-2 days out of 7, so still fine)
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12:31 < sword_smith> darosior7: Thanks for the explanation. I think I should watch a video about it. I might be too dense to understand your condensed explanation.
12:32 < sword_smith> Does walletnotify exist for c-lightning? How do I get push messages/script execution whenever I receive a payment?
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12:59 <@cdecker> sword_smith: that would be very easy to implement as a plugin. There are notifications you can subscribe in the plugin, and it can then ping whatever service, using whatever protocol you want
12:59 < darosior7> sword_smith: there is not, think of C-lightning as a core which comports only core functionalities that is aimed to be extended via plugins, tools or whatsoever. What is fun is that I was wondering about making a plugin just for push notifications (I added them to lightning-qt using notify2 if you are interested in making your first plugin feel
12:59 < darosior7> free to take this code)
13:00 < darosior7> https://github.com/darosior/lightning-qt/commit/fb0954a4411546b44f2d4ed2cad08cb20cce7d0f
13:00 <@niftynei> cdecker beat me to it. i was going to say you can use plugin notifications like https://github.com/ElementsProject/lightning/blob/master/doc/PLUGINS.md#invoice_payment
13:00 < darosior7> ^^ We all answered at the same time
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13:03 <@niftynei> the first link is for receiving notification of payment, there's also a hook that allows you to modify how c-lightning responds to a payment attempt (you can also cancel them) https://github.com/ElementsProject/lightning/blob/master/doc/PLUGINS.md#invoice_payment-1
13:07 < darosior7> And sword_smith about your first message "Thanks for the explanation. I think I should watch a video about it." => if you want a video I recommend this one https://www.youtube.com/watch?v=8zVzw912wPo which gives a great overall vision. I think rusty made some blog posts *searching* here it is https://rusty.ozlabs.org/?p=450 . The paper is also
13:07 < darosior7> quite understandable https://lightning.network/lightning-network-paper.pdf (even if some terms have changed).
13:07 < darosior7> " I might be too dense to understand your condensed explanation." => feel free to ask, I can uncondense :-)
13:08 < sword_smith> I already read half the LN "whitepaper". I quite enjoyed it.
13:10 < sword_smith> Allow me to try: Assume three nodes and two channels: (A,B,C) and ((A,B),(B,C)). Also assume A wants to send to C.
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13:11 < sword_smith> C then generates a secret key, SK, and sends SHA256(SK) to A.
13:12 < darosior7> Yes, except it does not need to be a "key"
13:12 < darosior7> Just some random data (bytes)
13:12 < sword_smith> OK
13:13 < sword_smith> But who then makes the first payment, does B or does A?
13:13 < sword_smith> Receiving the SK somehow proves to A that B has paid C, I guess?
13:14 < sword_smith> (We can also call SK X if you prefer)
13:14 < darosior7> Yes, the name does not matter
13:15 < sword_smith> If the receiving of X by A proves that B has paid C, then B must pay C before A pays B, correct?
13:15 < darosior7> Actually A asks B to add an HTLC with H(X) (basically I pay you if you give me X) and B adds one with C
13:15 < darosior7> Then
13:16 < darosior7> C gets its funds from B, since it can resolves the contract (he generated X in the first place)
13:16 < darosior7> Then B resolves the HTLC with A
13:16 < darosior7> In order to let the time for B to resolve, timelocks are used
13:17 < darosior7> "f the receiving of X by A proves that B has paid C, then B must pay C before A pays B, correct?" => correct
13:17 < sword_smith> Is some kind of opcode for calculating hashes used for this?
13:19 < sword_smith> Do the HTLCs contain the opcode 0xa8 and is that how the X/H(X) logic is enforced?
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13:20 < sword_smith> 0xa8 is OP_SHA256
13:22 < darosior7> We use HASH160
13:22 < darosior7> ripemd160(sha256())
13:23 < darosior7> As often in BItcoin :-)
13:23 < sword_smith> Got it. Just like addresses.
13:23 < sword_smith> So its 0xa9 :)
13:24 < sword_smith> But is that how the opcode is used, that you can somehow unlock some output if you have X?
13:25 < darosior7> I dont understand the question ?
13:27 < sword_smith> "Actually A asks B to add an HTLC with H(X)" => Does this mean that one of the outputs is only redeemable if you have X (and not H(X))?
13:30 < darosior7> Yes, or by A after some time
13:30 < darosior7> Tried to simplify
13:32 < sword_smith> Ah. I have a vague feeling that I am closer to understanding it now.
13:33 < darosior7> Great ! 
13:34 < sword_smith> I wrote a compiler for EVM a couple of years ago. I would probably gain a better understanding of Bitcoin if I started programming in Bitcoin script.
13:34 < darosior7> The video I linked you should give some confidence too, maybe enough to understand the complexity of the actual implementation of that idea ;-)
13:35 < darosior7> sword_smit: Yes ! I did that in PYthon a year ago and it actually made me understand a lot of things
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