Cryptocurrency crimes and Blockchain Technology : Central Academy for Police Training(CAPT) Bhopal

The presentation was given at the Central Academy for Police Training(CAPT) Bhopal on 30 May 2019.The presentation covers an overview of what Blockchain technology is and how cryptocrimes are emerging off late with challenges to Law enforcement agencies.

   BLOCKCHAIN TECHNOLOGY & CRYPTOCURRENCY CRIMES by Anupam Tiwari on Scribd

BLOCKCHAIN TECHNOLOGY & CRYPTOCURRENCY CRIMES & CHALLENGES

   BLOCKCHAIN TECHNOLOGY & CRYPTOCURRENCY CRIMES by Anupam Tiwari on Scribd

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 :

Proof of Work and connect with BYZANTINE Generals

Proof of Work (PoW) is the original blockchain consensus algorithm, and is used in projects such as Bitcoin. It is the mechanism that enables users on a blockchain network to reach an agreed ‘truth’. A proof of work is essentially an answer to a complex mathematical problem. It takes a lot of work to find the Nonce but is easy for others to validate.PoW solves the Byzantine Generals Problem as it achieves a majority agreement without any central authority, in spite of the presence of unknown/potentially untrustworthy parties and despite the network not being instantaneous.This presentation brings out the concept Byzantine Generals proof and its connect with Bitcoin.

 

Proof of Work and connect with BYZANTINE Generals from anupriti

Test Ether Faucet : "Hello world" kind SMART CONTRACT

1.       Smart Contracts are self-executing contractual states, stored on the blockchain, which nobody controls and therefore everyone can trust.Continuing ahead with the earlier post wherein we created few test ethers from the ropsten test network and then transferred few back to create some transactions.In this post we move further and create a small smart contract.

First move to https://faucet.metamask.io/

Once you connect the same with your account,your will find an open code by default.Since just the beginning,we simply delete and create a fresh new page to insert the contract code in as seen below :

 Blank page as seen below :

Now goto https://github.com/ethereumbook/ethereumbook/tree/develop/code/Solidity

Find the code of the file faucet.sol

 copy the code...and save the file as faucet.sol

 code pasted

 Now the time to RUN

 Do a small change...amend the solidity program version like I have done to 5.1 and then also it asks to amend public to external

 Followed by submit

 Now time to deploy the same....

 

Transactions in METAMASK:Ropsten Test Network Ethereum

1. While at https://anupriti.blogspot.com/2019/01/metamask-extension-in-chromeinstallation.html we have installed metamask,now in this post we do a transaction of ethereum.While at the beginning learning stage we ideally should not be playing with real ethers,so there is a provision to get test ethers and do some dummy transactions to get a feel of how it actually works.

Firstly,we change the network choice from the Main Ethereum Network to Ropsten Test Network as seen in the screen shot below:

 Then we visit https://faucet.metamask.io/

 Simply request ether.I requested twice. :-)

 So,I got two ethers

In the transactions part,we see the links and while we click on any,we get to see the details of the transaction that reflect along with other details live from the ropsten test network explorer

 The transactions details as below :

 The details of Gas to be debited as seen below :

 So,now minus 1 ether and some gas,I am left with a rounded off 1 ether(not exactly one ether,its minus gas)

 The details seen in the Block explorer....as below

METAMASK extension in Chrome:Installation

MetaMask is a bridge that allows one to visit the distributed web of Ethereum in the browser. It allows anyone to run Ethereum dApps right in  browser without running a full Ethereum node.MetaMask includes a secure identity vault, providing a user interface to manage your identities on different sites and sign blockchain transactions.Below screen shots are self explanatory for installation of MetaMask in chrome browser.

Goto the extension link at google chrome store at https://chrome.google.com/webstore/category/extensions

 Search for MetaMask

 Add the extension as seen in the screen shot below

 Welcome screen of MetaMask

 Create your Password

 Click accept

Download your phrase and store it as deemed appropriate secret location,duly encrypted ...since this single phrase will be the key to fiddle with your ethers ahead

 Installation part complete