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bitcoindevs_london_feb2019.html
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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>Libbitcoin Introduction</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: Coverpage *********** -->
<section class ="box">
<img src="images/bitcoindevs_london_feb2019/title_slide.svg" class = "image" style = "z-index: -1;">
</section>
<!-- *********** END: Coverpage *********** -->
<!-- *********** BEGIN: Libbitcoin Overview *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">Libbitcoin Introduction</span>
</div>
<div class = "multi_text_box_container" style = "padding: 60px 0 0 0; font-size:22px">
<ul style = "width: 100%; list-style-type: none;">
<li><span class ="weight">Libbitcoin Overview</span>
</li>
<hr style = "height:15px; visibility:hidden;">
<div style="opacity: 0.5;">
<li><span class ="weight">Libbitcoin Explorer / System</span></li>
<ul style="list-style-type: circle;">
<li>HD Wallet Demo (Explorer/C++)</li>
<li>Transaction Endorsement Demo (Explorer/C++)</li>
<li>Script Machine Demo (C++)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Server</span></li>
<ul style="list-style-type: circle;">
<li>Public Server Design</li>
<li>ZMQ Server Interface</li>
<li>Websockets (V4)</li>
<li>Spender Index</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Node</span></li>
<ul style="list-style-type: circle;">
<li>Libbitcoin-Network (P2P)</li>
<li>Libbitcoin-Database</li>
<li>Parallel Initial Block Download (V4)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</div>
</ul> <!-- End of content list -->
</div>
</section>
<!-- *********** END: Libbitcoin Section *********** -->
<!-- *********** BEGIN: Libbitcoin Overview *********** -->
<section class = "box">
<div class = "title">
<span class = "weight">Libbitcoin</span> Introduction
</div>
<!-- 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/bitcoindevs_london_feb2019/libbitcoin_repos.svg" class = "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;">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 <br>Satoshi prototype</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Readability</li>
<ul style = "list-style-type: circle;">
<li>Clearly exposes Bitcoin protocol</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Performance</li>
<ul style = "list-style-type: circle;">
<li>Performant server design</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Scalability</li>
<ul style = "list-style-type: circle;">
<li>Reliable scale out of server interface</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Libbitcoin Overview *********** -->
<!-- *********** BEGIN: BX / C++ Agenda *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">Libbitcoin Introduction</span>
</div>
<div class = "multi_text_box_container" style = "padding: 60px 0 0 0; font-size:22px">
<ul style = "width: 100%; list-style-type: none;">
<div style="opacity: 0.5;">
<li><span class ="weight">Libbitcoin Overview</span>
</li>
<hr style = "height:15px; visibility:hidden;">
</div>
<li><span class ="weight">Libbitcoin Explorer / System</span></li>
<ul style="list-style-type: circle;">
<li>HD Wallet Demo (Explorer/C++)</li>
<li>Transaction Endorsements (Explorer/C++)</li>
<li>Script Machine Demo (C++)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<div style="opacity: 0.5;">
<li><span class ="weight">Libbitcoin Server</span></li>
<ul style="list-style-type: circle;">
<li>Public Server Design</li>
<li>ZMQ Server Interface</li>
<li>Websockets (V4)</li>
<li>Spender Index</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Node</span></li>
<ul style="list-style-type: circle;">
<li>Libbitcoin-Network (P2P)</li>
<li>Libbitcoin-Database</li>
<li>Parallel Initial Block Download (V4)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</div>
</ul> <!-- End of content list -->
</div>
</section>
<!-- *********** END: BX / C++ Agenda *********** -->
<!-- *********** BEGIN: Explorer Demo Wallets *********** -->
<section class ="box">
<div class = "title">
Explorer Demo:<span class = "weight"> HD Wallets</span>
</div>
<img src="images/bitcoindevs_london_feb2019/bx_0.svg" class = "image" style = "z-index: -3;">
</section>
<!-- *********** END: Explorer Demo Wallets *********** -->
<!-- *********** BEGIN: Explorer Demo Coinjoin *********** -->
<section class ="box">
<div class = "title">
Explorer Demo:<span class = "weight"> TX Endorsements</span>
</div>
<img src="images/bitcoindevs_london_feb2019/bx_1.svg" class = "image" style = "z-index: -3;">
</section>
<!-- *********** END: Explorer Demo Coinjoin *********** -->
<!-- *********** BEGIN: Explorer Demo Script Machine *********** -->
<section class ="box">
<div class = "title">
C++ Demo:<span class = "weight"> Script Machine</span>
</div>
<img src="images/bitcoindevs_london_feb2019/bx_2.svg" class = "image" style = "z-index: -3;">
</section>
<!-- *********** END: Explorer Demo Script Machine *********** -->
<!-- *********** BEGIN: Server Agenda *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">Libbitcoin Introduction</span>
</div>
<div class = "multi_text_box_container" style = "padding: 60px 0 0 0; font-size:22px">
<ul style = "width: 100%; list-style-type: none;">
<div style="opacity: 0.5;">
<li><span class ="weight">Libbitcoin Overview</span>
</li>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Explorer / System</span></li>
<ul style="list-style-type: circle;">
<li>HD Wallet Demo (Explorer/C++)</li>
<li>Coinjoin Demo (Explorer/C++)</li>
<li>Script Machine Demo (C++)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</div>
<li><span class ="weight">Libbitcoin Server</span></li>
<ul style="list-style-type: circle;">
<li>Public Server Design</li>
<li>ZMQ Server Interface</li>
<li>Websockets (V4)</li>
<li>Spender Index</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<div style="opacity: 0.5;">
<li><span class ="weight">Libbitcoin Node</span></li>
<ul style="list-style-type: circle;">
<li>Libbitcoin-Network (P2P)</li>
<li>Libbitcoin-Database</li>
<li>Parallel Initial Block Download (V4)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</div>
</ul> <!-- End of content list -->
</div>
</section>
<!-- *********** END: Server Agenda *********** -->
<!-- *********** BEGIN: Public Server Design *********** -->
<section class ="box">
<div class = "title">
Libbitcoin <span class = "weight">Public Interface Design</span>
</div>
<img src="images/bitcoindevs_london_feb2019/bitcoind_libbitcoin_rpc0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/bitcoind_libbitcoin_rpc1.svg" class = "fragment image" style = "z-index: -1;">
</section>
<!-- *********** END: Public Server Design *********** -->
<!-- *********** BEGIN: Dealer Socket *********** -->
<section class ="box">
<div class = "title">
Client <span class = "weight"> ZMQ Dealer Socket</span>
</div>
<img src="images/bitcoindevs_london_feb2019/zmq_dealer0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/zmq_dealer1.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/bitcoindevs_london_feb2019/zmq_dealer2.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/bitcoindevs_london_feb2019/zmq_dealer3.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/bitcoindevs_london_feb2019/zmq_dealer4.svg" class = "fragment image" style = "z-index: -1;">
</section>
<!-- *********** END: Dealer Socket *********** -->
<!-- *********** BEGIN: Router Socket *********** -->
<section class ="box">
<div class = "title">
Libbitcoin <span class = "weight"> ZMQ Router Socket</span>
</div>
<img src="images/bitcoindevs_london_feb2019/zmq_router0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/zmq_router1.svg" class = "fragment image" style = "z-index: -3;">
</section>
<!-- *********** END: Router Socket *********** -->
<!-- *********** BEGIN: Websockets *********** -->
<section class = "box">
<div class = "title">
Libbitcoin V4: <span class = "weight">Websockets Interface</span>
</div>
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 115px 0 0 0; width: 1300px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/websockets.svg" class = "image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 35%; font-size: 20px; 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;">V4: HTTP Server</li>
<ul style = "list-style-type: circle;">
<li>On top of ZMQ internal interface</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Websockets Endpoint</li>
<ul style = "list-style-type: circle;">
<li>Native browser support</li>
<li>JSON queries/response</li>
<li>Asynchronous subscription queries</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">JSON-RPC Endpoint</li>
<ul style = "list-style-type: circle;">
<li>Bitcoind compatibility</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Further Information</li>
<ul style = "list-style-type: circle;">
<li>Developed by <span class="inline_code">@Neillm</span>, <br>Libbitcoin Maintainer</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Websockets *********** -->
<!-- *********** BEGIN: Payment Address(Wallet) *********** -->
<section class = "box">
<div class = "title">
Spender Index: <span class = "weight">Wallet Client</span>
</div>
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 115px 0 0 0; width: 1300px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/address_index_wallet.svg" class = "image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 35%; font-size: 20px; 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 Wallet Restoration</li>
<ul style = "list-style-type: circle;">
<li>No dedicated address index</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Address History</li>
<ul style = "list-style-type: circle;">
<li>Standard payment types</li>
<ul style = "list-style-type: circle;">
<li>P2PK</li>
<li>P2PKH</li>
<li>Multisig</li>
<li>P2SH & P2SH(P2W)</li>
</ul>
<li>Full payment history</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">No blockchain scan required</li>
<ul style = "list-style-type: circle;">
<li><span class="inline_code">scantxoutset</span> provides no history</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Payment Address(Wallet) *********** -->
<!-- *********** BEGIN: Payment Address(Payment Server) *********** -->
<section class = "box">
<div class = "title">
Spender Index: <span class = "weight">Payment Server</span>
</div>
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 115px 0 0 0; width: 1300px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/address_index_payment0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/address_index_payment1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/address_index_payment2.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 35%; font-size: 20px; 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;">Address Subscription</li>
<ul style = "list-style-type: circle;">
<li>Asynchronous query</li>
<li>Renewable Subscription</li>
<li>Notifications:</li>
<ul style = "list-style-type: circle;">
<li>Unconfirmed TX pool</li>
<li>TX Confirmation</li>
</ul>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Payment Address(Payment Server) *********** -->
<!-- *********** BEGIN: Payment Address(SPV Client) *********** -->
<section class = "box">
<div class = "title">
Spender Index: <span class = "weight">SPV Client</span>
</div>
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 115px 0 0 0; width: 1300px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/address_index_spv0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/address_index_spv1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/address_index_spv2.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 35%; font-size: 20px; 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;">Address Subscription/Fetch History</li>
<ul style = "list-style-type: circle;">
<li>For SPV wallet addresses</li>
<li>Confirmation heights</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Fetch & Validate Header Chain</li>
<ul style = "list-style-type: circle;">
<li>Libbitcoin-system: <span class="inline_code">chain_state</span></li>
<ul style = "list-style-type: circle;">
<li>Retargeting/Forks without lookups</li>
</ul>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Validate TX Inclusion</li>
<ul style = "list-style-type: circle;">
<li>Merkle block for TX associated with addresses</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Payment Address(SPV Client) *********** -->
<!-- *********** Begin: Agenda(node) *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">Libbitcoin Introduction</span>
</div>
<div class = "multi_text_box_container" style = "padding: 60px 0 0 0; font-size:22px">
<ul style = "width: 100%; list-style-type: none;">
<div style="opacity: 0.5;">
<li><span class ="weight">Libbitcoin Overview</span>
</li>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Explorer / System</span></li>
<ul style="list-style-type: circle;">
<li>HD Wallet Demo (Explorer/C++)</li>
<li>Coinjoin Demo (Explorer/C++)</li>
<li>Script Machine Demo (C++)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Server</span></li>
<ul style="list-style-type: circle;">
<li>Public Server Design</li>
<li>ZMQ Server Interface</li>
<li>Websockets (V4)</li>
<li>Spender Index</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</div>
<li><span class ="weight">Libbitcoin Node</span></li>
<ul style="list-style-type: circle;">
<li>Libbitcoin-Network (P2P)</li>
<li>Libbitcoin-Database</li>
<li>Parallel Initial Block Download (V4)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</ul> <!-- End of content list -->
</div>
</section>
<!-- *********** END: Agenda(node) *********** -->
<!-- *********** BEGIN: Libbitcoin-Network *********** -->
<section class = "box">
<div class = "title">
Libbitcoin <span class = "weight">Network (P2P)</span>
</div>
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 115px 0 0 0; width: 1300px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/network.svg" class = "image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 35%; font-size: 20px; 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;">Asynchronous: C++ Boost-Asio</li>
<ul style = "list-style-type: circle;">
<li>Concurrency without threads</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">P2P object maintains channels</li>
<ul style = "list-style-type: circle;">
<li>Configurable</li>
<li>Ping/Pong/Address channel protocols</li>
<li>P2P object interface:</li>
<ul style = "list-style-type: circle;">
<li>Subscribe to new channel</li>
<li>Subscribe to channel messages</li>
<li>Connect to endpoint, etc.</li>
</ul>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Additional protocols</li>
<ul style = "list-style-type: circle;">
<li>See <span class="inline_code">libbitcoin-node</span></li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Libbitcoin-Network *********** -->
<!-- *********** BEGIN: Libbitcoin-Database *********** -->
<section class = "box">
<div class = "title">
Libbitcoin <span class = "weight">Database</span>
</div>
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 115px 0 0 0; width: 1300px;">
<!-- 60% div for formula and curve-->
<div class = "" style = "width: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/store0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/store1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/store2.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/store3.svg" class = "fragment image" style = "z-index: -3;">
</div>
</section>
<!-- *********** END: Libbitcoin-Database *********** -->
<!-- *********** BEGIN: Parallel IBD *********** -->
<section class = "box">
<div class = "title">
V4: <span class = "weight">Continuous Parallel Block Download</span>
</div>
<!-- 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: 40%; font-size: 22px;">
<img src="images/bitcoindevs_london_feb2019/parallel_IBD0.svg" class = "image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/parallel_IBD1.svg" class = "fragment image" style = "z-index: -3;">
<img src="images/bitcoindevs_london_feb2019/parallel_IBD2.svg" class = "fragment image" style = "z-index: -3;">
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 40%; font-size: 20px; 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;">Scalability: IBD/Catchup</li>
<ul style = "list-style-type: circle;">
<li>Parallelism & multiple threads</li>
<li>Significant parallel portion</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Parallel block download</li>
<ul style = "list-style-type: circle;">
<li>Strong header chain first</li>
<li>Block download work across channels</li>
<li>Slow peers dropped (S.D.)</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Parallel block store</li>
<ul style = "list-style-type: circle;">
<li>Parallel write of raw data</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">(Parallel block validation)</li>
<ul style = "list-style-type: circle;">
<li>(Standard input implies previous output)</li>
<li>(Not possible with native witness tx's)</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li style = "font-weight: bold;">Further information</li>
<ul style = "list-style-type: circle;">
<li>@evoskuil, lead Libbitcoin maintainer</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Parallel IBD *********** -->
<!-- *********** Begin: Agenda(node) *********** -->
<section class ="box">
<div class = "title">
<span class = "title weight">Libbitcoin Introduction</span>
</div>
<div class = "multi_text_box_container" style = "padding: 60px 0 0 0; font-size:22px">
<ul style = "width: 100%; list-style-type: none;">
<li><span class ="weight">Libbitcoin Overview</span>
</li>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Explorer / System</span></li>
<ul style="list-style-type: circle;">
<li>HD Wallet Demo (Explorer/C++)</li>
<li>Coinjoin Demo (Explorer/C++)</li>
<li>Script Machine Demo (C++)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Server</span></li>
<ul style="list-style-type: circle;">
<li>Public Server Design</li>
<li>ZMQ Server Interface</li>
<li>Websockets (V4)</li>
<li>Spender Index</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
<li><span class ="weight">Libbitcoin Node</span></li>
<ul style="list-style-type: circle;">
<li>Libbitcoin-Network (P2P)</li>
<li>Libbitcoin-Database</li>
<li>Parallel Initial Block Download (V4)</li>
</ul>
<hr style = "height:15px; visibility:hidden;">
</ul> <!-- End of content list -->
</div>
</section>
<!-- *********** END: Agenda(node) *********** -->
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