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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>Wallets</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/default.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: Bitcoin Address *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>Bitcoin Address Derivation<br>with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 18px;">
<li>In this code example, we will generate a Bitcoin address from a private key.</li>
<li>The derivation of the address from the public key is schematically described in the
<a href="wallets.html#/2" target="_blank">wallets</a> chapter.</li>
<li>In this example, we derive an address from a compressed public key point.</li>
<br>
<li>Note: Hardcoded address version prefixes are available in Libbitcoin:
<li>In the <span class= "inline_code">bc::wallet</span> namespace</li>
<ul>
<li><span class= "inline_code">ec_private::mainnet_p2kh</span></li>
<li><span class= "inline_code">ec_private::testnet_p2kh</span></li>
</ul>
</li>
</ul>
<br>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
int main() {
auto my_secret = bc::base16_literal(
"f3c8f9a6198cca98f481edde13bcc031b1470a81e367b838fe9e0a9db0f5993d");
bc::ec_compressed my_public_key;
bc::secret_to_public(my_public_key, my_secret);
// Public key hash.
auto my_public_key_hash = bc::bitcoin_short_hash(my_public_key);
auto addr_prefix = bc::wallet::ec_private::mainnet_p2kh; // Mainnet = 0x00
// auto addr_prefix = bc::wallet::ec_private::testnet_p2kh; // Testnet 0x6f
// Prefix || public key || checksum(4-bytes)
bc::data_chunk prefix_publickey_checksum(bc::to_chunk(addr_prefix));
bc::extend_data(prefix_publickey_checksum, my_public_key_hash);
bc::append_checksum(prefix_publickey_checksum);
// Bitcoin Address: Base58 encode byte sequence.
std::cout << bc::encode_base58(prefix_publickey_checksum) << std::endl;
}</code></pre>
<pre style = "font-size: 16px; margin: 20px 5px 5px 5px; padding: 0px;"
><code class = "shell"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:120px; width: 97%"
>$ g++ -std=c++11 -o bitcoin_address bitcoin_address.cpp $(pkg-config --cflags libbitcoin --libs libbitcoin)
$ ./bitcoin_address
13ggzjqKyFGQZtxNWUoG4BFDPAgdBijUe4
</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Bitcoin Address *********** -->
<!-- *********** BEGIN: WIF Format *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>WIF Private Key Format<br>with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 18px;">
<li>In this code example, we will derive a WIF private key from a wallet secret.</li>
<li>The derivation of the WIF format is described
<a href="wallets.html#/3" target="_blank">here</a>.</li>
<br>
<li>Note: Hardcoded address wif version prefixes are available in Libbitcoin:
<li>In the <span class= "inline_code">bc::wallet</span> namespace</li>
<ul>
<li><span class= "inline_code">ec_private::mainnet_wif</span></li>
<li><span class= "inline_code">ec_private::testnet_wif</span></li>
</ul>
</li>
</ul>
<br>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
int main() {
auto my_secret = bc::base16_literal(
"f3c8f9a6198cca98f481edde13bcc031b1470a81e367b838fe9e0a9db0f5993d");
auto prefix_secret_comp_checksum =
bc::to_chunk(bc::wallet::ec_private::mainnet_wif); // 0x80
// auto prefix_secret_comp_checksum =
// bc::to_chunk(bc::wallet::ec_private::mainnet_testnet); // 0xEF
bc::extend_data(prefix_secret_comp_checksum, my_secret);
bc::extend_data(prefix_secret_comp_checksum,
bc::to_chunk(bc::wallet::ec_private::compressed_sentinel)); // 0x01
bc::append_checksum(prefix_secret_comp_checksum);
// WIF (mainnet/compressed).
std::cout << bc::encode_base58(prefix_secret_comp_checksum) << std::endl;
}</code></pre>
<pre style = "font-size: 16px; margin: 20px 5px 5px 5px; padding: 0px;"
><code class = "shell"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:120px; width: 97%"
>$ g++ -std=c++11 -o wif wif.cpp $(pkg-config --cflags libbitcoin --libs libbitcoin)
$ ./wif
L5PbbAgFUENjW7XjzPBSMUwtVpV8S62cXq14cwUGDdCq1xt1SiNU
</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: WIF Format *********** -->
<!-- *********** BEGIN: EC_PRIVATE /EC_PUBLIC *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Private Key Wallet Class</span><br>in Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 18px;">
<li>Note on constructors:
<ul>
<li>A <a href="https://github.com/libbitcoin/libbitcoin/blob/master/include/bitcoin/bitcoin/wallet/ec_private.hpp" target="_blank">
<span class= "inline_code">ec_private</span></a>
object instantiation requires information on the secret,
public key compression, and both address and wif prefixes.
</li>
<li>Note that address and wif prefixes are not coupled
here. The prefixes (8bits each) are individually supplied in the parameters,
implied by the wif and explicit address version or a combined
version argument (16bits) of:<br>
<span class= "inline_code">wif_ver << 8 | address_ver</span>
</li>
<li>Combined (16bit) address & wif prefixes are hardcoded in:
<ul>
<li><span class= "inline_code">ec_private::mainnet</span></li>
<li><span class= "inline_code">ec_private::testnet</span></li>
</ul>
</li>
</ul>
</li>
<hr style="visibility:hidden"></hr>
<li>Note on serializer:
<ul>
<li>
<span class= "inline_code">ec_private::encoded</span> returns
a string of the base58 encoded wif key.
</li>
</ul>
</li>
<br>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "background: white; font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:750px ; width:97%"
>// Libbitcoin Version 3.
class bc::wallet::ec_private
{
public:
// Constructors.
ec_private();
ec_private(const ec_private& other);
ec_private(const std::string& wif, uint8_t version=mainnet_p2kh);
ec_private(const wif_compressed& wif, uint8_t version=mainnet_p2kh);
ec_private(const wif_uncompressed& wif, uint8_t version=mainnet_p2kh);
ec_private(const ec_secret& secret, uint16_t version=mainnet,
bool compress=true);
// Serializer.
std::string encoded() const;
// Accessors.
const ec_secret& secret() const;
const uint16_t version() const;
const uint8_t payment_version() const;
const uint8_t wif_version() const;
const bool compressed() const;
// Methods.
ec_public to_public() const;
payment_address to_payment_address() const;
// ..
}</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: EC_PRIVATE *********** -->
<!-- *********** BEGIN: EC_PUBLIC *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Public Key Wallet Class </span>in Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 18px;">
<li>Note on Constructors:
<ul>
<li>The <a href="https://github.com/libbitcoin/libbitcoin/blob/master/include/bitcoin/bitcoin/wallet/ec_public.hpp" target="_blank">
<span class= "inline_code">ec_public</span></a> object can
be instantiated from a <span class= "inline_code">ec_private</span>
object but loses all information on address prefixes.
The public key compression setting will be inherited.
</li>
</ul>
</li>
<hr style="visibility:hidden"></hr>
<li>Note on Serializer:
<ul>
<li>This returns the base16 encoded compressed or uncompressed
public key point according to the set compression byte.
</li>
</ul>
</li>
<hr style="visibility:hidden"></hr>
<li>Note on <span class= "inline_code">ec_public::to_data</span>:
<ul>
<li>This method outputs the public key in either its ec_compressed
or uncompressed form as a data chunk according to the compression byte
set in the object.
</li>
</ul>
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "background: white; font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:750px ; width:97%"
>// Libbitcoin Version 3.
class bc::wallet::ec_public
{
public:
// Constructors.
ec_public();
ec_public(const ec_public& other);
ec_public(const ec_private& secret);
ec_public(const data_chunk& decoded);
ec_public(const std::string& base16);
ec_public(const ec_compressed& point, bool compress=true);
ec_public(const ec_uncompressed& point, bool compress=false);
// Serializer.
std::string encoded() const;
// Accessors.
const ec_compressed& point() const;
const uint8_t payment_version() const;
const bool compressed() const;
// Methods.
bool to_data(data_chunk& out) const;
bool to_uncompressed(ec_uncompressed& out) const;
payment_address to_payment_address(uint8_t version=mainnet_p2kh) const;
// ..
}</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: EC_PUBLIC *********** -->
<!-- *********** BEGIN: Basic Wallet *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>Basic Wallet with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 19px;">
<li>In this code example, we will create a derive payment
addresses from a wallet secret using the private and public
wallet Libbitoin classes.
</li>
<hr style="visibility:hidden"></hr>
<li>Note on prefixes:
<li>
<ul>
<li>The WIF will include the mainnet wif prefix, since
this is implied in the construction of the private wallet object.</li>
<li>However, when deriving the address, the address prefix
(mainet/testnet) must be supplied explicitly.</li>
</ul>
</li>
</ul>
<br>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
int main() {
auto my_secret = bc::base16_literal(
"f3c8f9a6198cca98f481edde13bcc031b1470a81e367b838fe9e0a9db0f5993d");
bc::wallet::ec_private my_private(
my_secret,
bc::wallet::ec_private::mainnet,
true); // Compression = true.
// WIF private key.
std::cout << "WIF private key (Base58): "
<< my_private.encoded() << std::endl;
// 1st ec_public from ec_private (compression argument inherited)
bc::wallet::ec_public my_public(my_private);
// 2nd ec_public from point and true compression argument.
bc::wallet::ec_public my_public2(my_public.point(), true);
// Verify my_public/my_public2 are identical.
std::cout << "my_public & my_public2 are equal: "
<< (my_public.encoded() == my_public2.encoded()) << std::endl;
// Payment addresses: Default to mainnet.
std::cout << "Mainnet Address: "
<< my_public.to_payment_address() << std::endl;
std::cout << "Testnet Address: "
<< my_public.to_payment_address(bc::wallet::ec_private::testnet_p2kh)
<< std::endl;
}</code></pre>
<pre style = "font-size: 16px; margin: 20px 5px 5px 5px; padding: 0px;"
><code class = "shell"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:125px; width: 97%"
>$ g++ -std=c++11 wallet.cpp -o wallet $(pkg-config --cflags libbitcoin --libs libbitcoin)
$ ./wallet
WIF private key (Base58): L5PbbAgFUENjW7XjzPBSMUwtVpV8S62cXq14cwUGDdCq1xt1SiNU
my_public & my_public2 are equal: 1
Mainnet Address: 13ggzjqKyFGQZtxNWUoG4BFDPAgdBijUe4
Testnet Address: miCeHnvJnGhfM1RzE3mdt6TYFAHL5Lw4ep
</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Basic Wallet *********** -->
<!-- *********** BEGIN: Example - Mnemonic wordlist *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>Mnemonic Word List<br>with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 19px;">
<li>In this code example, we generate mnemonic word lists from
entropy of various lengths, which can individually be decoded
and stretched to 512 bit HD wallet seeds.
</li><br>
<li>Note on mnemonic methods:
<ul>
<li>Libbitcoin only provides a method to convert
and stretch a wordlist into a 512 bit wallet seed. Decoding
a wordlist back to its entropy value must be done with lower
level functions.
</li>
</ul>
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
int main() {
// 128, 160, 192, 224, 256 bits of entropy are valid for mnemonic encoding.
// We generate 128 bits of Entropy
bc::data_chunk my_entropy_128(16); //16 bytes = 128 bits
bc::pseudo_random_fill(my_entropy_128);
// We generate 160 bits of Entropy
bc::data_chunk my_entropy_160(20); //16 bytes = 128 bits
bc::pseudo_random_fill(my_entropy_160);
// ...
// We generate 256 bits of Entropy
bc::data_chunk my_entropy_256(32); //32 bytes = 256 bits
bc::pseudo_random_fill(my_entropy_256);
// Instantiate mnemonic word_list from entropy.
bc::wallet::word_list my_wordlist_128 = bc::wallet::create_mnemonic(my_entropy_128);
bc::wallet::word_list my_wordlist_160 = bc::wallet::create_mnemonic(my_entropy_160);
bc::wallet::word_list my_wordlist_256 = bc::wallet::create_mnemonic(my_entropy_256);
std::cout << "128bit wordlist: " << bc::join(my_wordlist_128) << std::endl;
std::cout << "160bit wordlist: "<< bc::join(my_wordlist_160) << std::endl;
std::cout << "256bit wordlist: "<< bc::join(my_wordlist_256) << std::endl;
// Generate a 512-bit HD Wallet Seed from mnemonic.
auto seed = bc::to_chunk(bc::wallet::decode_mnemonic(my_wordlist_128));
std::cout << "512bit HD Wallet Seed: "
<< bc::encode_base16(seed) << std::endl;
}</code></pre>
<pre style = "font-size: 16px; margin: 20px 5px 5px 5px; padding: 0px;"
><code class = "shell"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:125px; width: 97%"
>$ g++ -std=c++11 mnemonic_wordlist.cpp -o mnemonic_wordlist $(pkg-config --cflags libbitcoin --libs libbitcoin)
$ ./mnemonic_wordlist
128bit wordlist: artwork dentist rough start vast obvious icon dinosaur tell kid mention crush
160bit wordlist: mail lazy fringe parent cycle music slogan diary off mad frame thank great hill dad
256bit wordlist: eyebrow electric kit obvious result object ankle check fall settle neck idle lake craft identify climb uphold run satisfy town erode pattern ladder giant
512bit HD Wallet Seed: 7c25cdd3bf3f37036d179debeb73d48018ee17166f629f1634d5bdce8ef86617393b1361c93255262331bb4ed9221060969a45bbbd3a6bd8f4b88e700cb139c8
</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Example - Mnemonic wordlist *********** -->
<!-- *********** BEGIN: Extended Private Key Wallet Class *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Extended Private Key<br>Wallet Class </span>in Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 18px;">
<li>Note on constructors:
<ul>
<li>The <a href="https://github.com/libbitcoin/libbitcoin/blob/master/include/bitcoin/bitcoin/wallet/hd_private.hpp" target="_blank">
<span class= "inline_code">hd_private</span></a>
object instantiation requires information on the secret,
and private and public extended key versions.
</li>
<li>The private and public extended key version prefixes are not coupled.
The prefixes (32 bits each) are individually supplied in the parameters -
implied by the extended private key and explicit public key version or a combined
version argument (64bits) of:<br>
<span class= "inline_code">private_ver << 32 | public_ver</span>
</li>
<li>Combined (64bit) private & public extended key prefixes are hardcoded in:
<ul>
<li><span class= "inline_code">hd_private::mainnet</span></li>
<li><span class= "inline_code">hd_private::testnet</span></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "background: white; font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:750px ; width:97%"
>// Libbitcoin Version 3.
class bc::wallet::hd_private
{
public:
// Constructors.
hd_private();
hd_private(const hd_private& other);
hd_private(const data_chunk& seed, uint64_t prefixes=mainnet);
hd_private(const hd_key& private_key);
hd_private(const hd_key& private_key, uint64_t prefixes);
hd_private(const hd_key& private_key, uint32_t public_prefix);
hd_private(const std::string& encoded);
hd_private(const std::string& encoded, uint64_t prefixes);
hd_private(const std::string& encoded, uint32_t public_prefix);
// Serializer.
std::string encoded() const;
// Accessors.
const ec_secret& secret() const;
// Methods.
hd_key to_hd_key() const;
hd_public to_public() const;
hd_private derive_private(uint32_t index) const;
hd_public derive_public(uint32_t index) const;
// ..
}</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Extended Private Key Wallet Class *********** -->
<!-- *********** BEGIN: Extended Public Key Wallet Class *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Extended Public Key<br>Wallet Class </span>in Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 18px;">
<li>Note on Constructors:
<ul>
<li>The <a href="https://github.com/libbitcoin/libbitcoin/blob/master/include/bitcoin/bitcoin/wallet/hd_public.hpp" target="_blank">
<span class= "inline_code">hd_public</span></a> object can
be instantiated from an extended public key in a serialized
byte array format (hd_key) or a base58 encoded XPUB string.
</li>
</ul>
</li>
<hr style="visibility:hidden"></hr>
<li>Note on Serializer:
<ul>
<li>This returns the base58 encoded XPUB string.
</li>
</ul>
</li>
<hr style="visibility:hidden"></hr>
<li>Note on <span class= "inline_code">hd_public::hd_lineage</span>:
<ul>
<li>This <a href="https://github.com/libbitcoin/libbitcoin/blob/master/include/bitcoin/bitcoin/wallet/hd_public.hpp#L45-L54" target="_blank">
<span class= "inline_code">struct</span></a> contains
private & public prefixes, depth, parent fingerpint and
child index information.
</li>
</ul>
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "background: white; font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:750px ; width:97%"
>// Libbitcoin Version 3.
class bc::wallet::hd_public
{
public:
// Constructors.
hd_public();
hd_public(const hd_public& other);
hd_public(const hd_key& public_key);
hd_public(const hd_key& public_key, uint32_t prefix);
hd_public(const std::string& encoded);
hd_public(const std::string& encoded, uint32_t prefix);
// Serializer.
std::string encoded() const;
// Accessors.
const hd_chain_code& chain_code() const;
const hd_lineage& lineage() const;
const ec_compressed& point() const;
// Methods.
hd_key to_hd_key() const;
hd_public derive_public(uint32_t index) const;
// ..
}</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Extended Public Key Wallet Class *********** -->
<!-- *********** BEGIN: Example - HD Children *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>HD Child Derivation<br>with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 19px;">
<li>In this code example, we derive hd children extended keys
with Libbitcoin private and public extended key classes.
</li>
<hr style="visibility:hidden"></hr>
<li>HD child derivation paths are described in detail <a href="wallets.html#/9" target="_blank">
here</a>.
</li>
<hr style="visibility:hidden"></hr>
<li>Hardened child derivation paths are described <a href="wallets.html#/14" target="_blank">
here</a>.
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
int main() {
// 1) Derivation of Master Extended Keys from Mnemonic word list.
// ---------------------------------------------------------------------------
// Load mnemonic sentence into word list
std::string my_wordlist_string = "market parent marriage drive umbrella "
"custom leisure fury recipe steak have "
"enable";
auto my_wordlist = bc::split(my_wordlist_string, " ", true);
auto hd_seed = bc::to_chunk(bc::wallet::decode_mnemonic(my_wordlist));
// Instantiate master extended private key m with XPRV||XPUB mainnet prefixes.
bc::wallet::hd_private m(hd_seed, bc::wallet::hd_private::mainnet);
// Derivation of master extended public key M (hd_public).
auto M = m.to_public();
// 2) Derivation of Child Extended Keys.
// ---------------------------------------------------------------------------
// Derive children of master private extended key m.
auto m0 = m.derive_private(0);
auto m1 = m.derive_private(1);
auto m2 = m.derive_private(2);
// Derive grandchild private extended keys.
auto m10 = m1.derive_private(0); //Depth 2, Index 0
auto m11 = m1.derive_private(1); //Depth 2, Index 1
auto m12 = m1.derive_private(2); //Depth 2, Index 2
auto m100 = m10.derive_private(0); //Depth 3, Index 0
auto m101 = m10.derive_private(1); //Depth 3, Index 1
auto m102 = m10.derive_private(2); //Depth 3, Index 1
// Derive grandchild public extended keys
auto M00 = m0.derive_public(0); //Depth 2, Index 0
auto M01 = m0.derive_public(1); //Depth 2, Index 1
auto M02 = m0.derive_public(2); //Depth 2, Index 2
// ...
// Derive extended public key of any extended private key.
// of same depth & index
auto M102 = m102.to_public();
// Derive children of master public extended key M
auto M0 = M.derive_public(0); //Depth 1, Index 0
auto M1 = M.derive_public(1); //Depth 1, Index 1
auto M2 = M.derive_public(2); //Depth 1, Index 2
// Derive grandchild public extended keys.
auto M10 = M1.derive_public(0); //Depth 2, Index 0
auto M11 = M1.derive_public(1); //Depth 2, Index 1
auto M12 = M1.derive_public(2); //Depth 2, Index 2
auto M100 = M10.derive_public(0); //Depth 3, Index 0
auto M101 = M10.derive_public(1); //Depth 3, Index 1
// ...
// 3) Derivation of Hardened Child Extended Keys.
// ---------------------------------------------------------------------------
// Hardened private key derivation with index >= 1 << 31
auto m00h = m0.derive_private(bc::wallet::hd_first_hardened_key);
auto m01h = m0.derive_private(1 + bc::wallet::hd_first_hardened_key);
auto m02h = m0.derive_private(2 + bc::wallet::hd_first_hardened_key);
// Hardened public key can only be derived from hardened extended private key
auto M00h = m00h.to_public();
// or from parent private key.
auto M00h_ = m0.derive_public(bc::wallet::hd_first_hardened_key);
// Verify that the above keys are equivalent.
std::cout << (M00h == M00h_) << std::endl;
}</code></pre>
<pre style = "font-size: 16px; margin: 20px 5px 5px 5px; padding: 0px;"
><code class = "shell"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:125px; width: 97%"
>$ g++ -std=c++11 hd_children.cpp -o hd_children $(pkg-config --cflags libbitcoin --libs libbitcoin)
$ ./hd_children
1
</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Example - HD Children *********** -->
<!-- *********** BEGIN: Example - Extended Keys Format *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>Extended Key Format (XPRV/XPUB) with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 19px;">
<li>In this code example, we truncate the XPRV extended key
format according to its individual components described
<a href="wallets.html#/10" target="_blank">here</a>.
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
int main() {
// Derive Master Keys from mnemonic.
std::string my_wordlist_string = "market parent marriage drive umbrella "
"custom leisure fury recipe steak have "
"enable";
auto my_wordlist = bc::split(my_wordlist_string, " ", true);
auto hd_seed = bc::to_chunk(bc::wallet::decode_mnemonic(my_wordlist));
bc::wallet::hd_private m(hd_seed, bc::wallet::hd_private::mainnet);
auto m1 = m.derive_private(1);
// Extended Private Key:
auto m1_xprv = m1.to_hd_key();
std::cout << "Version (4B): "
<< bc::encode_base16(bc::slice<0,4>(m1_xprv)) << std::endl;
std::cout << "Depth (1B): "
<< bc::encode_base16(bc::slice<4,5>(m1_xprv)) << std::endl;
std::cout << "Parent Fingerprint (4B): "
<< bc::encode_base16(bc::slice<5,9>(m1_xprv)) << std::endl;
std::cout << "Index (4B): "
<< bc::encode_base16(bc::slice<9,13>(m1_xprv)) << std::endl;
std::cout << "Chain Code (32B): "
<< bc::encode_base16(bc::slice<13,45>(m1_xprv)) << std::endl;
std::cout << "Private Key (32B): "
<< bc::encode_base16(bc::slice<45,78>(m1_xprv)) << std::endl;
std::cout << "Checksum (4B): "
<< bc::encode_base16(bc::slice<78,82>(m1_xprv)) << std::endl;
// Verify Checksum.
auto checksum_msg = bc::to_chunk(bc::slice<0,78>(m1_xprv));
bc::append_checksum(checksum_msg);
auto checksum = bc::slice<78,82>(bc::to_array<82>(checksum_msg));
std::cout << "Checksum verification: "
<< (checksum == bc::slice<78,82>(m1_xprv)) << std::endl;
// Print out XPRV in base58 encoded format.
std::cout << "Base58 encoded XPRV format: "
<< bc::encode_base58(bc::to_chunk(m1_xprv)) << std::endl;
}</code></pre>
<pre style = "font-size: 16px; margin: 20px 5px 5px 5px; padding: 0px;"
><code class = "shell"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:125px; width: 97%"
>$ g++ -std=c++11 hd_children.cpp -o hd_children $(pkg-config --cflags libbitcoin --libs libbitcoin)
$ ./hd_children
Version (4B): 0488ade4
Depth (1B): 01
Parent Fingerprint (4B): bc84f083
Index (4B): 00000001
Chain Code (32B): f241333e306f8e51190af377055f2673e701796f923f526e8d7a0aaa3f5d2825
Private Key (32B): 00e42ba2cd0016aecfd97ef46f7815e8799327f775da339968890916d94073fded
Checksum (4B): cd8c6bd5
Checksum verification: 1
Base58 encoded XPRV format: xprv9vHWkmShDnGvte8183RjQU5ZTXMj69V8GH3fkNBDeXeMFLJ8dbMXsWc73b9tGrDBrsLNKPLyA7a8CN2YBfbaWU4eCmhsTcXyQ5yuQeorvqS
</code></pre>
</div><!-- End of 70% container -->
</div><!-- End of multi box container -->
</section>
<!-- *********** END: Example - Extended Keys Format *********** -->
<!-- *********** BEGIN: Example - HD Exposure *********** -->
<section class = "box">
<!-- No Title Bar ... -->
<div class = "multi_code_box_container" style = "padding: 0;">
<div class = "text_box code_text_box" style = "width: 28%;">
<div class ="text_box_title" >
<span class = "weight">Example:<br></span>Unhardened Key Exposure with Libbitcoin
</div>
<div style = "padding:5px;">
<ul style = "margin: 0px; padding: 0px; list-style-type: none; font-size: 19px;">
<li>In this code example, we will demonstrate how the exposure
of an unhardened child private key and parent extended public key can
lead to the exposure of parent private keys and all subsequent
child derivation paths.
</li>
<li>The example closely follows the derivation steps described
<a href="wallets.html#/11" target="_blank">here</a>
</li>
</ul>
</div>
</div>
<!-- <div id="" style="overflow:scroll; height:400px;"> -->
<!-- overflow-y: scroll; -->
<!-- <div style = "overflow-y: scroll; height: 500px; width: 70%; text-align: left;"> -->
<div style = "width:70%">
<pre style = "font-size: 18px; margin: 5px; padding: 0px;"
><code class = "c++"
style = "font-family: Roboto Mono; margin: 0px; padding: 10px; max-height:575px ; width:97%"
>#include <bitcoin/bitcoin.hpp>
#include <iostream>
#include <secp256k1.h>
#include "secp256k1_initializer.hpp"
int main() {
bc::data_chunk my_entropy_128(16);
bc::pseudo_random_fill(my_entropy_128);
bc::wallet::hd_private m(my_entropy_128, bc::wallet::hd_private::mainnet);
// Parent M public key & chaincode are exposed.
bc::wallet::hd_public M = m.to_public();
// Child m_0 secret is exposed.
auto m_0_secret = m.derive_private(0).secret();
// 1) Derive L256 from hmac_sha512_hash(parent public key||index, chaincode).
// ---------------------------------------------------------------------------
uint32_t index = 0;
auto data = bc::splice(M.point(), bc::to_big_endian(index));
auto intermediate = bc::split(bc::hmac_sha512_hash(data, M.chain_code()));
auto left_256 = intermediate.left;
// 2) Parent Private(m) = child private(m_0) - L256.
// ---------------------------------------------------------------------------
const auto context = bc::verification.context();
if (secp256k1_ec_privkey_negate(context,left_256.data()) != 1)
{
return 1;
}
bc::ec_add(left_256, m_0_secret);