Block Chain distributed ledger

1. BLOCK CHAIN
- Saranya Krishnan
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2. Block chain -DatabaseDefinition
a digital ledger in which
transactions made in bitcoin or
another cryptocurrency are
recorded chronologically and
publicly.
A blockchain is a continuously
growing list of records, called
blocks, which are linked and
secured using cryptography .Each
block contains typically a hash
pointer as a link to a previous
block, a timestamp and
transaction data.
The first distributed blockchain7/10/2018 2

3. Block chain - database
 A blockchain database consists
of two kinds of records:
transactions and blocks.
 Blocks hold batches of valid
transactions that are hashed
and encoded into a Merkle tree.
 Each block includes the hash of
the prior block in the blockchain,
linking the two. Merkle tree is a
tree in which every non-leaf
node is labelled with the hash
of the labels or values (in case
of leaves) of its child nodes.
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4. 7/10/2018 4

5. Blockchain
 A transaction is a transfer of value between Bitcoin wallets that gets
included in the block chain. Bitcoin wallets keep a secret piece of data
called a private key or seed, which is used to sign transactions, providing a
mathematical proof that they have come from the owner of the wallet.
 Bitcoin -first digital currency solved double spending problem ,without the
use of central server.
 Double Spending problem - Digital currency can be spent twice .
 Miners bring new Bitcoins into the world via a complex mathematical and
computing process. So far 12 million Bitcoins have been mined. By 2140
there will be 21 million Bitcoin at which point creating more will become
impossible.
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6. Block Chain -Process
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7. Language-Bitcoin
 Bitcoin Core, is written primarily in C++, with various resource
files and scripts in other languages. There are lightweight clients
like MultiBit and Bitcoin Wallet (Android), is bitcoinj. It is written in
Java.
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8. Bit Coin
1. 1 Bitcoin equals 2,21,376.58
Indian Rupee
2. 1 BTC = 3489.48 USD
3. 3600 bitcoins mined each day.
4. Only 36 % bitcoins are active in
market
5. Vancouver - boasted the world's
first bitcoin cash machine
Facts Denomination
Subunit
 10^-3 millibitcoin
 10^−6 microbitcoin, bit
 10^−8 satoshi
 Symbol BTC, XBT
 millibitcoin mBTC
 microbitcoin, bit μBTC
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9. Benefits of Blockchain
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10. Block chain -DisadvantageA bitcoin transfer is irreversible
If you could attack or damage
the blockchain creation tools on a
private corporate server, you
could effectively control 100
percent of their network and alter
transactions however you wished.
Bitcoin has gained the attention
of the mainstream media; one
way is the WannaCry ransomware
created in May 2017.
Bitcoins hinges on the ability to
use them to purchase illegal
goods.
National digital currencies7/10/2018 10

11. Infographics Explaining How Blockchain Can Change Healthcare
 http://www.ancapetre.com/5-infographics-explaining-how-blockchain-can-
change-healthcare
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12. Block Chain - Health Care
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13. Reference links
 http://davidederosa.com/basic-blockchain-programming/
 https://www.pinterest.com/pin/191754896611861318/
 https://www.pinterest.com/pin/717761259333241384/
 https://www.intelligenthq.com/innovation-management/blockchain-5-key-
concepts/
 https://in.pinterest.com/pin/469007748667591817/.
 http://www.ancapetre.com/5-infographics-explaining-how-blockchain-can-
change-healthcare
 https://99bitcoins.com/50-insane-facts-about-bitcoin-infographic/
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