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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>P2P</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: P2P connections *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">P2P Connections</span>
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/p2p_connections.svg" class = "image" style = "z-index: -1;">
<!-- <img src="images/wallets/mnemonics1.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/wallets/mnemonics2.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/wallets/mnemonics3.svg" class = "fragment image" style = "z-index: -1;"> -->
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 50%; font-size: 20px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Outbound Peer</li>
<ul>
<li>Attempts to maintain maximum # of outbound connections.</li>
<li>Local acquires remote addresses through gossiping</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Inbound Peer</li>
<ul>
<li>Node accepts up to maximum set # inbound connections.</li>
<li>Inbound peers obtains local address through gossiping.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Manual Peer</li>
<ul>
<li>Node can set permanent peers in settings.</li>
<li>Will always attempt to maintain connection to these.</li>
</ul>
<hr style = "height:5px; visibility:hidden;">
<li>All peer connection types follow the same Bitcoin messaging protocol once established.</li>
<br>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: P2P connections *********** -->
<!-- *********** Begin: Channel handshake *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Version Protocol</span>
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/version_protocol0.svg" class = "image" style = "z-index: -1;">
<img src="images/p2p/version_protocol1.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/p2p/version_protocol2.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/p2p/version_protocol3.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/p2p/version_protocol4.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/p2p/version_protocol5.svg" class = "fragment image" style = "z-index: -1;">
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 50%; font-size: 20px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">P2P Messaging is Asynchronous</li>
<ul>
<li>Different to Client-Server calls.</li>
<li>Each peer may handle messages at any time.</li>
<li>Received message notifications invoke handlers.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Peers negotiate highest common channel version</li>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">VERSION</li>
<ul>
<li>Peer sends its P2P messaging version.</li>
<li>And additional information (available services ...)</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">VERACK</li>
<ul>
<li>Peer acknowledges version from peer.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<br>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Channel Handshake *********** -->
<!-- *********** Begin: Ping Protocol *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Ping Protocol</span>
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/ping_protocol.svg" class = "image" style = "z-index: -1;">
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 20px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Ping protocol determines whether underlying TCP connection still active.</li>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received/Sent: PING</li>
<ul>
<li>Peer attempts ping transmission.</li>
<li>Successful socket transmission indicates live connection.</li>
<li>Otherwise node will close peer connection.</li>
<li>Heartbeat intervals are in node settings.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: PONG</li>
<ul>
<li>Version 60001 and above.</li>
<li>Peer responds to PING with PONG.</li>
<li>Includes same nonce as in PING.</li>
<li>Indicates responsive service/Roundtrip latency.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: PONG</li>
<ul>
<li>Resubscriptions to messages are renewed after each received message.</li>
</ul>
<br>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Channel Handshake *********** -->
<!-- *********** Begin: Addr Protocol *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Address Protocol</span>
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/address_protocol.svg" class = "image" style = "z-index: -1;">
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 20px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Peer discovery through address protocol.</li>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: GETADDR</li>
<ul>
<li>Requests known addresses from peer.</li>
<li>One response to GETADDR only allowed per connection.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: ADDR</li>
<ul>
<li>Can be sent proactively.</li>
<li>Seeding Peer: Sends own address.</li>
<li>Response to GETADDR: Up to 1000 addresses.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Sent: GETADDR</li>
<ul>
<li>Requests host address from peer.</li>
</ul>
<br>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Addr Protocol *********** -->
<!-- *********** Begin: Channel Lifetime *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Channel Lifetime</span>
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/channel_lifetime.svg" class = "image" style = "z-index: -1;">
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 20px; margin: 60px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Handshake Protocol.</li>
<ul>
<li>Negotiate channel version.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Subsequently: Ping/Pong/Address</li>
<ul>
<li>Channel heartbeat.</li>
<li>Exchange of known peers.</li>
<li>Maintain channel is closed.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Other messaging protocols provide:</li>
<ul>
<li>(Initial) blockchain sync.</li>
<li>Propagation of mempool transactions.</li>
<li>Exchange of chain-extending blocks.</li>
<li>Other protocol types for different sessions.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Channel Lifetime *********** -->
<!-- *********** Begin: P2P Peer Lifetime *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Peer Lifetime</span>
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/peer_lifetime.svg" class = "image" style = "z-index: -1;">
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 35px 0 0 0; width: 1270px;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 16px; margin: 0px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Seed Sessions.</li>
<ul>
<li>Contact seed peers to seed peer addresses.</li>
<li>Node Settings:</li>
<ul>
<li>Seeding peer addresses.</li>
<li>Min # addresses to be acquired.</li>
</ul>
<li>All seed channels disconnect after seeding.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Manual/Outbound/Inbound Session</li>
<ul>
<li>Contact seed peers to seed peer addresses.</li>
<li>Node Settings:</li>
<ul>
<li>Max In/Outbound channels.</li>
<li>Manual channel peers.</li>
</ul>
<li>Same protocols attached to each channel.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Channel Protocols.</li>
<ul>
<li>Seed/Address: Exchange known peer addresses.</li>
<li>Transaction in/out:</li>
<ul>
<li>Propagate new mempool TX’s</li>
</ul>
<li>Block in/out:</li>
<ul>
<li>Propagate new blocks</li>
<li>Exchange of chain-extending blocks.</li>
</ul>
</ul>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Peer Lifetime *********** -->
<!-- *********** Begin: TX In *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Transaction-In </span>Protocol
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/tx_in_protocol.svg" class = "image" style = "z-index: -1;">
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 20px; margin: 40px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Received: TRANSACTION(TX)</li>
<ul>
<li>Can be received anytime.</li>
<li>OOrganised into mempool.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: INV(TX)</li>
<ul>
<li>Inventory message includes up to 50’000 TXIDs.</li>
<li>GETDATA(INV) to request transaction data.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Sent: FEEFILTER</li>
<ul>
<li>minimum feerate sat/kb for tx relay</li>
</ul>
<li style = "font-weight: bold;">Sent: MEMPOOL</li>
<ul>
<li>Request mempool, peer responds with single/multiple INVs.</li>
</ul>
<br>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: TX In *********** -->
<!-- *********** Begin: TX Out *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Transaction-Out </span>Protocol
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/tx_out_protocol.svg" class = "image" style = "z-index: -1;">
<!-- 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;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 20px; margin: 40px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Received: FEEFILTER</li>
<ul>
<li>Can be adjusted anytime.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: MEMPOOL</li>
<ul>
<li>Inventory message includes up to 50’000 TXIDs.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: GETDATA</li>
<ul>
<li>Payload identical to INV message</li>
<li>Respond with serialised transaction</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Node mempool event:</li>
<ul>
<li>For new transaction organised into mempool, announce to peer.</li>
</ul>
<br>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: TX Out *********** -->
<!-- *********** Begin: Block In *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Block-In </span>Protocol
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/block_in_protocol0.svg" class = "image" style = "z-index: -1;">
<img src="images/p2p/block_in_protocol1.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/p2p/block_in_protocol2.svg" class = "fragment image" style = "z-index: -1;">
<img src="images/p2p/block_in_protocol3.svg" class = "fragment image" style = "z-index: -1;">
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 20px 0 0 0; width: 1350px;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 18px; margin: 10px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Received: HEADERS</li>
<ul>
<li>Headers are organised into header chain.</li>
<li>Blocks from strong header chain requested with get_data</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: INV</li>
<ul>
<li>Request headers if unknown.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: BLOCKS</li>
<ul>
<li>Response to get_data(INV(Blocks))</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Sent: SEND_HEADERS</li>
<ul>
<li>Sendheaders >=70012 (BIP130).</li>
<li>Ask peer to announce headers rather than INV</li>
</ul>
<li style = "font-weight: bold;">Sent: GET_HEADERS</li>
<ul>
<li>Includes hashes, height.</li>
<li>Header hashes begin with 10 highest known.</li>
<li>Hash heights increase exponentially until genesis hash.</li>
<li>Hash Stop: request headers up to this header.</li>
<ul>
<li>0x00..00 no limit</li>
<li>Hash of received orphan.</li>
</ul>
</ul>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Block In*********** -->
<!-- *********** Begin: Block Out *********** -->
<section class = "box">
<div class = "title">
<span class = "title weight">Block-Out </span>Protocol
</div>
<!-- Derivation Graphic -->
<img src="images/p2p/block_out_protocol.svg" class = "image" style = "z-index: -1;">
<!-- 2 column container -->
<!-- 45% div for formula and curve--><!-- 45% text & bulletpoint -->
<div class = "multi_text_box_container" style = "padding: 0px 0 0 0; width: 1350px;">
<!-- 45% div for formula and curve-->
<div class = "" style = "width: 60%; font-size: 22px;">
<div style ="text-align: center;">
</div>
</div>
<!-- 45% text & bulletpoint -->
<div class = "text_box"
style = "width: 55%; font-size: 17px; margin: 20px 0 0 0">
<ul style = "margin: 0; padding: 0px; list-style-type: none;">
<li style = "font-weight: bold;">Received: GET_HEADERS</li>
<ul>
<li>Lookup included header hashes.</li>
<li>Send beginning with highest common strong chain hash.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: GET_BLOCKS</li>
<ul>
<li>Lookup included header hashes.</li>
<li>Send INV beginning with highest common strong chain hash.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Received: GET_DATA</li>
<ul>
<li>Send type of block requested:</li>
<ul>
<li><span class="inline_code">witness_block</span>/<span class="inline_code">block</span></li>
<li><span class="inline_code">compact_block</span></li>
<li><span class="inline_code">filtered_block</span></li>
</ul>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Sent: SEND_COMPACT</li>
<ul>
<li>Send compact blocks (BIP152)</li>
<li>Compact block: Header+Short IDs.</li>
<li>Only unknown TXs data is requested.</li>
</ul>
<hr style = "height: 5px; visibility: hidden;">
<li style = "font-weight: bold;">Broadcast of new blocks</li>
<ul>
<li>INV/Header/Compactblocks depending on peer.</li>
</ul>
</ul>
</div>
</div><!-- End of 2 column container -->
</section>
<!-- *********** END: Block In*********** -->
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