Blockchain is a distributed database that is used to maintain a continuously growing list of records, called blocks. Each block contains a timestamp and a link to a previous block and is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks.Bitcoin is a proven application that runs on BLOCKCHAIN.This ppt gives the reader an over view of the concept of BLOCKCHAIN.The same was presented by self on 20th June 2017 at Gurgaon Commissioner of Police office during Summer Internship Program under aegis of Shri Rakshit Tandon
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Blockchain and Bitcoin : A Technical Overview
1.
2. The views expressed in this
presentation are Mere Apne.
Reference to any specific products,
process ,or service do not
necessarily constitute or imply
endorsement, recommendation, or
views of Min of Def or Govt
All images used are for illustrative
purposes only & Do not
promote any specific product
9. Paap se Dharti phati-phati-phati, Adharm
se aasmaan,
Atyachaar se kaanpi Insaaniyat,
Raj kar rahe Haivaan ...
Jinki hogi taqat apoorv,
Jinka hoga nishana abhed,
Joh karenge inka sarvanaash ...
………….woh kehlayenge Tridev
10.
11.
12. Name used by the unknown person
or persons who designed BITCOIN
and created its original reference
implementation
SATOSHI NAKAMOTO
Kahan Gaya Usay Dhoondo
13.
14.
15.
16. AS OF 10TH JUN 2017
1 BITCOIN IS WORTH
2907$
SO 1 BITCOIN IS
184951
35. Distributed Ledger is a Consensus of
Replicated, Shared & Synchronized
digital data geographically spread across
multiple sites & countries
36. Type of Distributed Ledger, comprised
of Unchangeable, Digitally
Recorded Data in packages called
BLOCKS
TAMPER EVIDENT LEDGER
37.
38. Linked list data structure, with
each block containing a
hash of the previous block
39. Proof Of Work Is A Piece Of Data
Which Is Difficult To Produce But
Easy For Others To Verify And Which
Satisfies Certain Requirements
Bitcoin Uses
The Hashcash Proof
Of Work System.
40. Each block is formed by a proof-of-
work algorithms, through which
consensus of this distributed
system could be obtained via the
longest possible chain
41. Mining is the process
of writing pages
(blocks) of Bitcoin
transactions into the
Bitcoin ledger, called
‘The Bitcoin
Blockchain’, and
getting rewarded with
newly created bitcoins
46. A block is an aggregated set of data
Data is collected and
processed to fit in a block
through a process called
MINING
Each block could be identified using
a Cryptographic Hash
47. Block will contain a hash of the
previous block, so that blocks can
form a chain from the first block
ever (known as the Genesis
Block) to the formed block
48. Every 10 minutes, all Bitcoin
transactions taking place are bundled
into a block
These blocks linked through a
timestamp signing, form a
chain (blockchain), which goes
back to the first block ever
created (mined)
The time stamping makes it
impossible to alter any part of it
once the network confirms it
49. These rules are inbuilt in the
Bitcoin core software, which
every node in the Bitcoin
network runs.
Before a new block is added to the
blockchain, the Bitcoin network has
to reach a consensus on based on
predetermined rules
50. Data in a blockchain is
internally consistent
and immutable
Each block’s hash is
derived from the
contents of the block
Each block refers to
the previous block’s hash,
not a sequential number
58. A user for CONDUCTING
TRANSACTIONS utilizing BITCOIN,
he or she must first DOWNLOAD and
setup a BITCOIN WALLET
BITCOIN WALLET can show the
total BALANCE of all BITCOINS it
CONTROLS and let A USER PAY a
specified AMOUNT
59. WALLET contains a USER’S
PRIVATE KEY, which ALLOWS
FOR THE SPENDING of the
BITCOINS, which are located in
the BLOCK CHAIN
Once wallet is INSTALLED &
CONFIGURED, an ADDRESS
is GENERATED which is
SIMILAR to an E-MAIL or
PHYSICAL ADDRESS
60. WALLET is basically
the Bitcoin Equivalent
of a Bank account.
Allows to RECEIVE BITCOINS,
STORE them, and then SEND
them to others
61. Connected to the Internet
or is online is said to be HOT
Cold Wallets & Hot Wallets
Cold is considered
most Secure &
suitable for Storing
Large Amounts of
bitcoins
Hot is suitable for
Frequently
Accessed funds
COLD implies it is Offline or
Disconnected from the
Internet
62. Designedto be downloaded
& used on Laptops/PCs
DESKTOPWALLETS
Armory, Multibit, Msigna
and Hiveto mention a FEW
Easyto Access.
Available for Different OS
– Windows, Mac OS and Ubuntu.
65. PHYSICALWALLETS
Once they are generated, you
print them out on a piece of
paper
Paper Wallets can
Securely hold your BITCOINS
in Cold Storage form for a
long time
Bitaddress.org
or Blockchain.info
66. BitcoinQt is the First ever built
bitcoin CLIENT WALLET
BITCOINCLIENTS
WALLETS
Original bitcoin
wallet used by the
Pioneers of the
currency
COMPUTERS installed with these wallets
FORM PART OF THE CORE
NETWORK & have access to all
transactions on the blockchain
72. When we say SOMEONE HAS
BITCOINS & you look at a
PARTICULAR BITCOIN ADDRESS,
there are NO DIGITAL BITCOINS held
AGAINST that ADDRESS
BALANCE of any BITCOIN
address ISN’T HELD at that
ADDRESS; one MUST
RECONSTRUCT it by looking at
the BLOCKCHAIN
73. Everyone on the NETWORK knows about a
TRANSACTION and THE HISTORY
OF A TRANSACTION can be TRACED
BACK to the point where the BITCOINS
were produced
78. BITCOIN-QT FOLDER STRUCTURE
Blocks – This subdirectory contains blockchain data and
contains a “blk.dat” file and a “blocks/index”
subdirectory.
“blk.dat” stores actual Bitcoin blocks dumped
in raw format.
The “blocks/index subdirectory” is a database
that contains metadata about all known blocks
79. Chainstate subdirectory- it is a
database with a compact
representation of all currently unspent
transactions and some metadata about
where the transactions originated
BITCOIN-QT FOLDER STRUCTURE
81. Private key of the suspect, they can
search for that particular key on the
Blockchain to Trace the purchases
to other potential Suspects.
investigator has the Bitcoin
82.
83. BITCOIN FORENSIC ARTIFACT EXAMINATION
Windows 7 Professional
Multibit
Bitcoin-Qt
Bitminter
Basic USB ASIC Bitcoin
Gateway laptop ML6720
120 GB WD hard drive
(4) USB ASIC Mining
drives
USB powered cooling fan
32 GB USB thumb drive
84. Utilizing the data from
344
transactions,
Meiklejohn able to
identify the owners of
more than a million
Bitcoin addresses
Sarah Meiklejohn, a Bitcoin focused
Computer Researcher
Extensive Research
in
Bitcoin Blockchain
Found that by looking
blockchain an
investigator can
uncover who owns a
Bitcoin addresses
85. Bitcoin transactions occur via a
Network Connection, an investigator
should seize any Physical Object that
can connect to the Internet in addition
to the hard drive
COLLECTION OF BITCOIN ARTIFACTS
86.
87. • System Info
• Info about Logged users
• Registry Info
• Remnants of Chats
• Web browsing Activities
• Recent Communications
• Info from Cloud Services
• Decryption Keys for encrypted
volumes mounted
COLLECTION OF BITCOIN ARTIFACTS
96. SMART CONTRACTS are computer protocols
that facilitate, verify, or enforce the negotiation
or performance of a CONTRACT, or that make a
contractual clause unnecessary. Smart
contracts often EMULATE the logic of
contractual clauses.
