remyers

Coin selection for liquidity providers

Bitcoin Core's coin selection algorithms optimizes mostly for the following metrics:

• keep a low utxo count by consolidating regularly
• avoid creating a change output
• when a change output is needed, use an amount equivalent to the payment (for privacy)

This doesn't match what liquidity providers need. Liquidity providers need to:

remyers

The async-payment user story I'm interested in exploring is a mobile user (not always connected) who wants to receive donations (no PoP) via a static invoice from another mobile user.

My understanding of how this could work:

1. The static invoice should contain a blinded route to the payment receiver via their LSP and an ephemeral public key that the payment sender will use to encrypt the last hop of a payment onion containing a keysend TLV. The LSP of the payment receiver must support store-and-forward of onion messages.

2. A payment sender builds a payment onion where the first hop is their LSP that supports trampoline payments, onion messages and async-payments. The first hop of the onion includes a TLV to indicate the payment should be held until triggered (with a async-payment nonce) and gives the blinded route to the payment receiver. The last hop of the onion is encrypted to the payment receiver's ephemeral public key and includes:

• the keysend TLV payment secret
• the amount being sent

remyers

#!/bin/bash

shopt -s expand_aliases
alias btc-cli='bitcoin-cli -datadir=.bitcoin'

if [[ $# -lt 3 ]]; then echo "usage: $0 <rpcwallet-from> <rpcwallet-to> <maximum confirmations>" ; exit 1 ; fi

FROM=$1
TO=$2
CONFIRMATIONS=$3

remyers

CLN (openchannel, openchannel2)	LND (ChannelAcceptResponse)	Eclair	Description	Example plugin use cases	Include?	Reason
result	accept	AcceptOpenChannel, RejectOpenChannel	accept or continue the channel open	whitelist	Yes	basic usage
psbt, our_funding_msat		fundingAmount, psbt?	to add inputs/outputs

remyers

$remoteport = bash.exe -c "ifconfig eth0 | grep 'inet '"
$found = $remoteport -match '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}';

if( $found ){
  $remoteport = $matches[0];
} else{
  echo "The Script Exited, the ip address of WSL 2 cannot be found";
  exit;
}

remyers

#! /bin/sh
counter=$1
while [ $counter -gt 0 ]
do
    cupsenable Canon_MX410_series__5FE302000000
    sleep 60
done

remyers

Thoughts on timeouts for eltoo/lot49 based on conversation with Snyke Aug4, 2020.

• Assume online access to blockchain data once per week
• Then the settlement tx CSV should be 1 week (~1008 blocks)
• BUT the problem is: what if upstream node does not have fully signed update tx?
• NOT a problem for for nodes that originate or receive a payment because they do not have both an upstream AND downstream peers.

Bad Scenario: Node connections: A-> B -> C

remyers

                                                                                         
  [Fund Channel]                                                                         
    |                                                                                    
    |                                                                                    
    |                                                                                    
    v                                                                                    
   P=Musig(A,B)+scripts (for Taproot script-path spend)                                  
   Q=Musig(A,B) (for Taproot key-path spend)                                             
                                                                                         
   OR ----------- [Cooperative Close]                                                    

remyers

Ubuntu 18.04 install steps:

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install software-properties-common
$ sudo apt install python-pip -y
$ sudo apt install python3-pip -y
$ sudo apt install python3.7-venv -y
$ sudo apt install python3.7-dev -y

remyers

Add this code at end of add_eltoo_witness
  self.log.debug("\nbtcdeb --tx=%s --txin=%s --modify-flags=\"-NULLFAIL\"\n",tx_hex, spend_tx_hex)
  
  
or to debug from a transaction:
   self.log.debug("btcdeb --tx=%s --txin=%s\n", ToHex(close_tx), ToHex(setup_tx[A]) )

Add code before and in the method after the normal CHashWriter call to serialize the txTo.

 template <class T>