the age of cryptocurrency at Devoxx Morocco

#DevoxxCoin
By BELLAJ Badr
Twitter @badrbellaj
The Age of Cryptocurrency
Developers Let’s Discover A new
opportunity
Bellaj.badr@gmail.com
Linkedin.com/in/bellajbadr

Twitter @Badrbellaj#DevoxxCoin
The Age of Cryptocurrency
•Money is …..?
•In Math 𝑥 + 𝑎 𝑛 = 𝑘=0
𝑛 𝑛
𝑘
𝑥 𝑘 𝑎 𝑛−𝑘 we trust.
•What is the Crypto-currency?
•How it works (Bitcoin)?
•Behind the scene(Block Chain Technology)
•Start coding for Bitcoin/BC
•Demo.

Twitter @badrbellaj#DevoxxCoin
$ WhoamI?

Money is …

Why Money ?
With money you could exchange
goods in a market for a common
medium of exchange.

Currency Evolution

Currency Evolution
Rai Stone
The Stone money
4Tons
Solution Anti-Pickpocket

Paper money was introduced in China during the 11th
century.
In the 13th century, paper money became known in
Europe.
PAPER ..No Way????
Currency Evolution
The problems begins :(

A centralized system

inflation/diflation
the Vietnam War and persistent balance of payments deficits, led U.S.
President Richard Nixon to end international convertibility of the U.S.
dollar to gold on August 15, 1971
Governments (banks) prints easily money to pay debts, pay more salaries …
without regard for a stable currency.

Inflation/Hyper Inflation

How money is crated
Based on credits !!

In a centralized model, NO!!

In a god they trust
I have no trust in the god they trust
• Inflation
• Slow transfers (2 business days)
• Expensive transfers
• Ease of seizure
• local

Wait After all, Everything is
digital why not Money?
Digital currencies are needed for a
digital world

@Badrbellaj#DevoxxCoin
The Cryptocurrency
Bitcoin
DREAMS BECOMES REALITY

A digital currency in which encryption techniques are used to
regulate the generation of units of currency and verify the
transfer of funds, operating independently of a central bank
within a peer to peer network.
We trust in Math/ Encryption

• In 2008 A whitepaper was
posted on the internet by
Satoshi Nakamoto
titled Bitcoin: A Peer-to-Peer
Electronic Cash System. It
described a sytem of
cryptocurrency that was not
backed by any government or
any form of existing currency.
Bitcoin ("BTC") since 2008

• Bitcoin is an Open-Source project (software)
• The most successful & the first fully implemented
crypto currency.
• Bitcoin is a peer to peer Network (over internet) and a
Currency base.
Bitcoin

Bitcoin

Public key cryptography was
invented in the 1970s and is a
mathematical foundation for
computer and information security
In Math we trust
We trusts
In something (gold) we trusts In someone (bankers) we trusts

High transparency
High resilience / availability
High Trust/security
High Efficiency/Low Coast
High performance
universal
Bitcoin is a better form of money

Venture capitalists have
invested more than
$500 million (£340m)
into Bitcoin-related
startups.

Bitcoin/$

How it Works
THE AGE OF CRYPTOCURRENCY

Transactions

Proof of Work
To get paid for their hash, a miner must find a hash that starts with a certain sequence.
(for example, 000)
This extends the amount of time the miner must spend on each block (avoid inflation)

Blockchain
A persistent,
distributed
database, put
assets into a
transparent ledger,
everyone has a
copy. It is
Cryptographly
secure.

Blockchain
BC resolves a complex
problem : how to initiate
trust without a
centralized authority

Inside Blockchain
Bitcoin/Blockchain
is a transparent
system

DEMOBitcoin Core

>>bitcoind –regtest
>>bitcoin-cli regtest generate 101 //frst time
>>bitcoin-cli regtest getbalance
Bitocoin core is available at bitcoin.org
Bitcoin core

Talk is cheap, Show Me The
Code

Let’s code for Bitcoin
BITCOINJIs Open source(Apache licensed) & Java

Get started with BitcoinJ
You can download the library as a JAR, or use Maven, or get the code from
github.
Documentation : https://bitcoinj.github.io/javadoc/0.13.3/
bitcoinj is a library for working with the Bitcoin protocol. It
can maintain a wallet, send/receive transactions without
needing a local copy of Bitcoin Core and has many other
advanced features

BitcoinJ Sample
final NetworkParameters params = RegTestParams.get();
final DumpedPrivateKey dumpedPrivateKey = new DumpedPrivateKey(RegTestParams.get(),
"cQWVW6Vj3E7qEH4DSxN5HGcE29YTPQhpKBzJGXEcQ7LtWtEZ9YGK");
final ECKey key = dumpedPrivateKey.getKey();
System.out.println("BTC address that will be added: " +
key.toAddress(RegTestParams.get()));
System.out.println("Private key that will be added: " +
key.getPrivateKeyEncoded(RegTestParams.get()));
Address addressFromKey = key.toAddress(params);
System.out.println("On the network, we can use this address:n" + addressFromKey);
final WalletAppKit kit = new WalletAppKit(RegTestParams.get(), new File("Doxx"),
"Devoxx BTC") {
protected void onSetupCompleted() {
}
};

DEMOBitcoinJ

BTC is 42 000 lines of code only
As of June 30, there
were 6,109 Github
repositories
referencing Bitcoin. By
comparison, there were
2,318 repositories
referencing Paypal.

Blockchain is here to stay

Projects based on BC
NamCoin
BitMessage
Storaj.IO
Zennet (super computer)
La’zooz
Etherum (smartcontract)

@YourTwitterHandle#DVXFR14{session hashtag} Twitter @Badrbellaj#DevoxxCoin
The Age of
Crypto currency

the age of cryptocurrency at Devoxx Morocco

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