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Showing posts with label bitcoin forensics. Show all posts
Showing posts with label bitcoin forensics. Show all posts

Tuesday, April 27, 2021

Blockchain Forensics & Cryptocurrencies : NFSU FDP 09 April 2021

The School of Cyber Security and Digital Forensics, National Forensic Sciences University, Gandhinagar organised a 5 day online Faculty Development Program (FDP) on 'Advanced Trends in Digital Forensics' from 05 Apr-09 Apr 2021.The aim of this FDP was to promote research and strengthen the Digital Forensic Investigation Techniques which include topics like crime investigation, latest trends in Digital Forensics, Fake News Detection, and Drone & Crypto Forensics. I was a invited speaker here and am sharing my presentation deck here on blockchain and cryptocurrency forensics.

 



 

Cryptocurrency Forensics and Blockchain Technology by Anupam Tiwari on Scribd

Saturday, May 02, 2020

Installation Bitcoin core on UBuntu 18.0.4 LTS : Bitcoin Mechanics -1

With this first post special to Bitcoin core,over next few months I intend to do some exploring on the bitcoin mechanics part.This basically means playing with the blocks and blockchain vide few python based scripts.Will start from the installation part followed by other posts on extracting info from bitcoin blockchain. This post basically is straight forward installation with the following commands.Screen shots for info :

Firstly install snapd with the following commands

sudo apt update
sudo apt install snapd

 
 click green button install

after this installation of snapd,one single command as follows:

sudo snap install bitcoin-core

The effected screenshots are seen below :


Once installed ,you can check on the terminal...should see three bitcoin applications by tabbing


While the GUI shows as below


When you run for the first time,the GUI notification pops for asking for location of default directory for storing blocks.


Thereafter the blocks start getting downloaded with status of files downloaded visible....


Blocks downloaded status is seen below...this downloading around 287 GB as on date will take time as per download speed available.


The location of the blocks being downloaded will be at /home/bitcoin_scripts/snap/bitcoin-core/common/.bitcoin/blocks where bitcoin_scripts is the user name.

Next post we will see whats inside the block....

Friday, April 05, 2019

BLOCKCHAIN TECHNOLOGY & CRYPTOCURRENCY CRIMES & CHALLENGES



Today gave a talk on  "BLOCKCHAIN TECHNOLOGY & EMERGING CRYPTOCURRENCY CRIMES & CHALLENGES". The talk was part of first of its kind FDP held at RGPV University Bhopal.Few pics as seen below from the event

 



 
Covered in press as seen below :

Saturday, November 17, 2018

BLOCKCHAIN TECHNOLOGY OVERVIEW & CRYPTOCURRENCY CRIMES: CBI ACADEMY

Sharing this presentation here in this post that brings an exhaustive overview of the Blockchain Technology and emerging Cryptocurrencies crimes.The presentation was given at CBI Academy on 16 Nov 18 by self :


























Monday, April 02, 2018

Bitcoin Address Generation : The Internals Behind

ECDSA stands for Elliptic Curve Digital Signature Algorithm and uses an elliptic curve and a finite field to "sign" data in such a way that third parties can verify the authenticity of the signature while the signer retains the exclusive ability to create the signature. The Bitcoin addressing system is not a simple deal.In order to maintain that a public key cannot be deciphered easily to any identity and in future if ECDSA is compromised at all, still,the anonymity remains.So suppose you have a ECDSA based private key,the following post content will give a step by step sequence of how the final bitcoin address is derived :
Sequence flow chart is shown below :

Image courtesy : https://www.safaribooksonline.com/library/view/mastering-bitcoin-2nd/9781491954379/assets/mbc2_0405.png

Your sample private key :

18E14A7B6A307F426A94F8114701E7C8E774E7F9A47E2C2035DB29A206321725

Public key derived is 

0450863AD64A87AE8A2FE83C1AF1A8403CB53F53E486D8511DAD8A04887E5B2
3522CD470243453A299FA9E77237716103ABC11A1DF38855ED6F2EE187E9C582
BA6

Site reference : https://www.bitaddress.org

Screen shot below : 

 Now perform SHA-256 hashing on the hex of the public key as shown below in the screenshot :

The SHA-256 output received is 

600ffe422b4e00731a59557a5cca46cc183944191006324a447bdb2d98d4b408

Now we take RIPEMD-160 Hash of the above output and get this as follows as seen vide the screenshot :

010966776006953d5567439e5e39f86a0d273bee

Now add Add version byte in front of RIPEMD-160 hash (0x00 for Main Network).so that the above output becomes :


00010966776006953D5567439E5E39F86A0D273BEE

Further to above,Perform SHA-256 hash on the extended RIPEMD-160 result ie

 
 so we get
445c7a8007a93d8733188288bb320a8fe2debd2ae1b47f0f50bc10bae845c094

and now we perform SHA-256 hash on the result of the this recent SHA-256 hash as seen below in the screenshot...and we get this as 

d61967f63c7dd183914a4ae452c9f6ad5d462ce3d277798075b107615c1a8a30


Now take the first 4 bytes of the second SHA-256 hash and this is the address checksum ie D61967F6

and then add the 4 checksum bytes at the end of extended RIPEMD-160 hash as hashed above and we get the 25-byte binary Bitcoin Address.

00010966776006953D5567439E5E39F86A0D273BEED61967F6

Now the last step...we  Convert the result from a byte string into a base58 string using Base58Check encoding at https://incoherency.co.uk/base58/

 Bitcoin Address : 
16UwLL9Risc3QfPqBUvKofHmBQ7wMtjvM

Useful links : 

Monday, March 19, 2018

BLOCKCHAIN ,BITCOIN & CRYPTOCURRENCIES WORLD : MECHANICS AND CYBER CRIME

The world of Blockchain and Cryptocurrencies is undeniably amazing and has infinity to explore at hands.Recently I took on a 4 hour session at the prestigious Central Bureau of Investigations,CBI Academy ,Ghaziabad, vide Indian Technical and Economic Cooperation Programme organised by Ministry of External Affairs,to cover right from scratch to overview of mechanics and architecture of how this world works.Sharing here the presentation for info and awareness of anyone who is interested to take a dip in this domain and related cyber crime activities.


Sunday, February 25, 2018

Symposium on Legal Regulation of Bitcoin, Blockchain & Cryptocurrencies

On 22nd Feb, participated in Symposium on Legal Regulation of Bitcoin, Blockchain & Cryptocurrencies held at G D Goenka University,Sohna Road.I was privileged to meet Joerg Molt from the Satoshi School.Sharing my presentation here for info of readers.


and few pics of event below















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