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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>北京比特幣聚會 Beijing Meetup July 2018</title>
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/simple.css">
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="lib/css/xcode.css">
<!-- Theme override for teachbitcoin -->
<link rel="stylesheet" href="css/teachbitcoin.css">
<!-- Google Font Roboto -->
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300,400,400i,600" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Roboto+Mono" rel="stylesheet">
</head>
<body>
<div class="reveal">
<div class="slides">
<!-- *********** BEGIN: Title Slide *********** -->
<section class = "box">
<img src="images/beijing_meetup_july2018/libbitcoin_title_graphic.jpg" class = "image" style = "z-index: -3;">
<div class = "multi_text_box_container" style = "padding: 330px 0 0 0;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none;">
<li style = "font-weight:600; font-size:55px">Libbitcoin,<br>Bitcoin's Swiss Army Knife</li>
<li style = "font-weight:300; font-size:43px">(Two app ideas built with Libbitcoin)</li>
<hr style = "visibility:hidden;">
<hr style = "visibility:hidden;">
<li style = "font-weight:300; font-size:33px">28/07/18 Beijing Bitcoin Meetup</li>
</ul>
</div>
</section>
<!-- *********** END: Title Slide *********** -->
<!-- *********** BEGIN: Title Slide *********** -->
<section class = "box">
<img src="images/beijing_meetup_july2018/libbitcoin_title_graphic.jpg" class = "image" style = "z-index: -3;">
<div class = "multi_text_box_container" style = "padding: 300px 0 0 0;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none;">
<li style = "font-weight:600; font-size:35px">James Chiang</li>
<li style = "font-weight:600; font-size:35px">Blockchain Tech Consultant</li>
<li style = "font-weight:300; font-size:35px">[email protected]</li>
</ul>
</div>
</section>
<!-- *********** END: Title Slide *********** -->
<!-- *********** BEGIN: Libbitcoin Overview *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight" >Libbitcoin</span> Overview
</div>
<!-- Derivation Graphic -->
<!-- <img src="images/wallets/hd_child_private.svg" class = "image" style = "z-index: -2;"> -->
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/libbitcoin0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/libbitcoin1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/libbitcoin2.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/libbitcoin3.svg" class = "fragment image" style = "z-index: -3;">
<!-- <img src="images/wallets/hd_child_keys_step_1.svg" class = "fragment image" style = "z-index: -2;">
<img src="images/wallets/hd_child_keys_step_2.svg" class = "fragment image" style = "z-index: -1;"> -->
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 45%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">C++ Bitcoin Library</li>
<ul style = "list-style-type: circle;">
<li>Lead Maintainer: Eric Voskuil</li>
<li>Initiator: Amir Taaki</li>
<li>First alternative implementation to Satoshi prototype</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Modular Design</li>
<ul style = "list-style-type: circle;">
<li>Independent component builds</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">API exposes Bitcoin protocol</li>
<ul style = "list-style-type: circle;">
<li>Focus on readability</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Scalable Server-Client Design</li>
<ul style = "list-style-type: circle;">
<li>Performant Services</li>
<li>Scalable client-server interface design</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Useful Toolkit for Bitcoin Applications</li>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Libbitcoin Overview *********** -->
<!-- *********** BEGIN: Contents, HD Wallets *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">App Ideas: </span>Building with Libbitcoin
</div>
<div class = "multi_text_box_container" style = "padding: 100px 0 0 0;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none;">
<li style = "font-weight:600; font-size:40px">Multi-Fork Wallet</li>
<ul style = "list-style-type: circle; font-size:30px">
<li>Hierarchical Deterministic Wallets</li>
<li>Hard Forks & TX Replays</li>
<li>Building a Multi-fork Wallet</li>
</ul>
<hr style = "visibility:hidden;">
<div style="opacity:0.4">
<li style = "font-weight:600; font-size:40px">Lightning Watchtower</li>
<ul style = "list-style-type: circle; font-size:30px">
<li>Simple Payment Channel</li>
<li>State Outsourcing</li>
<li>Building & Scaling Watchtower</li>
</ul>
</div>
</ul>
</div>
</section>
<!-- *********** END: Contents, HD Wallets *********** -->
<!-- *********** BEGIN: HD Wallets *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Hierarchical Deterministic</span> Wallets
</div>
<!-- Derivation Graphic -->
<!-- <img src="images/wallets/hd_child_private.svg" class = "image" style = "z-index: -2;"> -->
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/hd_introduction0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/hd_introduction1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/hd_introduction2.svg" class = "fragment image" style = "z-index: -3;">
<!-- <img src="images/wallets/hd_child_keys_step_1.svg" class = "fragment image" style = "z-index: -2;">
<img src="images/wallets/hd_child_keys_step_2.svg" class = "fragment image" style = "z-index: -1;"> -->
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 45%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">HD Tree from Mnemonic</li>
<ul style = "list-style-type: circle;">
<li>HD: Hierarchical Determinstic</li>
<li>Mnemonic: Word-Encoded Secret</li>
<li>Fresh keys can be derived indefinitely</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">HD Wallet Libbitcoin API</li>
<ul style = "list-style-type: circle;">
<li>BIP32/39 HD wallet primitives implemented</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">HD Tree Structure</li>
<ul style = "list-style-type: circle;">
<li>Specific key derivation paths depend on wallet usage</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: HD Wallets *********** -->
<!-- *********** BEGIN: Chain Forks *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Chain Fork & TX Replays</span>
</div>
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/chain_fork0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/chain_fork1.svg" class = "fragment image" style = "z-index: -3;">
<!-- <img src="images/beijing_meetup_july2018/hd_introduction1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/hd_introduction2.svg" class = "fragment image" style = "z-index: -3;"> -->
<!-- <img src="images/wallets/hd_child_keys_step_1.svg" class = "fragment image" style = "z-index: -2;">
<img src="images/wallets/hd_child_keys_step_2.svg" class = "fragment image" style = "z-index: -1;"> -->
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 45%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">At fork height: Same UXTO set</li>
<ul style = "list-style-type: circle;">
<li>Wallet keys valid can sign on both chains</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Transaction replay across chains</li>
<ul style = "list-style-type: circle;">
<li>Signatures can be valid on both chains</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Hard forked chains have replay projection</li>
<ul style = "list-style-type: circle;">
<li>Requires modification of transaction signature algorithm</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Support new chain parameters required...</li>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Chain Forks *********** -->
<!-- *********** TODO: Fork vs. Signature Mod Matrix *********** -->
<!-- *********** Begin: Modified Sighash *********** -->
<section class = "box">
<div class = "title">
Replay Protection: <span class = "title weight">Modified Sighash</span>
</div>
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/alt_sighash0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/alt_sighash1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/alt_sighash2.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 45%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">Signature hash is signed by private key</li>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Bcash modifies signature hash marker</li>
<ul style = "list-style-type: circle;">
<li>Sighash marker with forkID</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Libbitcoin API parameterises signing</li>
<ul style = "list-style-type: circle;">
<li>Sighash marker</li>
<li>Serialisation Algorithm (e.g. with BIP143)</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Modified Sighash *********** -->
<!-- *********** BEGIN: Multifork Wallet *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Multi-Fork</span> Wallet
</div>
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/multi_fork_wallet0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/multi_fork_wallet1.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 45%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">Wallet reconstructs HD tree for forked chain</li>
<ul style = "list-style-type: circle;">
<li>HD structure regenerated after each fork</li>
<li>Wallet queries forked chain node for unspent UXTOs</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Libbitcoin Server w/ new chain parameters</li>
<ul style = "list-style-type: circle;">
<li>New server for each set of chain parameters</li>
<li>Wallet can independently broadcast TXs on each forked chain</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Multifork Wallet *********** -->
<!-- *********** BEGIN: Contents, Watchtower *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">App Ideas: </span>Building with Libbitcoin
</div>
<div class = "multi_text_box_container" style = "padding: 100px 0 0 0;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none;">
<div style="opacity:0.4">
<li style = "font-weight:600; font-size:40px">Multi-Fork Wallet</li>
<ul style = "list-style-type: circle; font-size:30px">
<li>Hierarchical Deterministic Wallets</li>
<li>Hard Forks & TX Replays</li>
<li>Building a Multi-fork Wallet</li>
</ul>
<hr style = "visibility:hidden;">
</div>
<li style = "font-weight:600; font-size:40px">Lightning Watchtower</li>
<ul style = "list-style-type: circle; font-size:30px">
<li>Simple Payment Channel</li>
<li>State Outsourcing</li>
<li>Building & Scaling Watchtower</li>
</ul>
</ul>
</div>
</section>
<!-- *********** END: Contents, Watchtower *********** -->
<!-- *********** BEGIN: Naive Channel *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Payment Channel:</span> Naive Implementation
</div>
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/naive_channel0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/naive_channel1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/naive_channel2.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/naive_channel3.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/naive_channel4.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/naive_channel5.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/naive_channel6.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 45%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">Funding TX and Commitment TX 1</li>
<ul style = "list-style-type: circle;">
<li>Funding TX signed by A</li>
<li>Commitment TX 1 signed by both parties</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Valid Channel Close</li>
<ul style = "list-style-type: circle;">
<li>Latest commitment TX is broadcast by either party</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Problem: Invalid Channel Close</li>
<ul style = "list-style-type: circle;">
<li>Nothing prevents either party from broadcasting old state</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Naive Channel *********** -->
<!-- *********** BEGIN: RSMC *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">RSMC</span> Outputs
</div>
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<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
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<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/RSMC_output0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_output1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_output2.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_output3.svg" class = "fragment image" style = "z-index: -3;">
</div>
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<div class = "text_box"
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<ul style = "margin: 0; padding: 0px; list-style-type: none;">
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<li style = "font-weight: bold;">Revocable Sequence Maturity Contract</li>
<ul style = "list-style-type: circle;">
<li>Can be unlocked under two conditions</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Spendable after time-out</li>
<ul style = "list-style-type: circle;">
<li>RSMC A is spendable by A after a delay</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Spendable by secret R</li>
<ul style = "list-style-type: circle;">
<li>Public key R is generated by both parties</li>
<li>Public key R is generated without knowledge of secret R</li>
<li>If R is revealed, the output is no longer exclusively spendable by A</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
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<section class = "box">
<div class = "title">
<span class = "title weight">Payment Channel</span> with RSMC's
</div>
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<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
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<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/RSMC_channel0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_channel1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_channel2.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_channel3b.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/RSMC_channel4.svg" class = "fragment image" style = "z-index: -3;">
</div>
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<div class = "text_box"
style = "width: 40%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">Old states are revoked</li>
<ul style = "list-style-type: circle;">
<li>RSMC can be spent by counterparty</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Old broadcast states are swept</li>
<ul style = "list-style-type: circle;">
<li>Penalty TX by counterparty broadcast</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Chain needs to be watched</li>
<ul style = "list-style-type: circle;">
<li>Both parties must monitor chain for invalid commitment transactions</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Watchtower</li>
<ul style = "list-style-type: circle;">
<li>Channel participant outsources the monitoring of commitment transactions</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: RSMC Channel *********** -->
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<section class = "box">
<div class = "title">
<span class = "title weight">Watchtower</span>
</div>
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<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
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<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/watchtower0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/watchtower1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/watchtower2.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 40%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">Watchtower watches for broadcast commitment TXID</li>
<ul style = "list-style-type: circle;">
<li>Watches chain for first half of commitment TXID</li>
<li>Stores encrypted penalty TX</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Revoked commitment TX is broadcast</li>
<ul style = "list-style-type: circle;">
<li>Watchtower observes TXID of revoked commitment</li>
<li>Watchtower decrypts and broadcasts penalty TX</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Watchtower *********** -->
<!-- *********** BEGIN: Watchtower Implementation *********** -->
<section class = "box">
<div class = "title">
Building a <span class = "title weight">Watchtower</span>
</div>
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 40px 0 0 0; width: 1270px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 58%; font-size: 22px;">
<img src="images/beijing_meetup_july2018/watchtower_build0.svg" class = "image" style = "z-index: -3;">
<img src="images/beijing_meetup_july2018/watchtower_build1.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 40%; font-size: 24px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<!-- <hr style = "height:5px; visibility:hidden;"> -->
<li style = "font-weight: bold;">Watchtower stores Tuple (TXID, Blob)</li>
<ul style = "list-style-type: circle;">
<li>Each tuple can be monitored independently</li>
<li>Tuple can be outsources to different watchtowers</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Watchtower parses new blocks for TXIDs</li>
<ul style = "list-style-type: circle;">
<li>If TXID is found in store, penalty TX is decrypted and broadcast</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Scaling Watchtower with Libbitcoin</li>
<ul style = "list-style-type: circle;">
<li>Performant subscription & query service</li>
<li>ZMQ interface ideal for scaling</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Watchtower Implementation *********** -->
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