Blockchain

Research Output

Conference Papers
Blockchain and Internet of Things Opportunities and challenges. Download: https://goo.gl/woidKu

Technical Reports
Blockchain and Smart Contract State of the art. Download: https://goo.gl/ksWUtk
Decentralized Risk-aware Access Control. Download: https://goo.gl/egPDgm

Useful link to learn and install Bitcoin Blockchain

https://bitcore.io/guides/fullnode
https://en.bitcoin.it/wiki/Main_Page
https://github.com/bitcoin/bitcoin/blob/master/doc/build-unix.md
https://dev.visucore.com/bitcoin/doxygen/
https://github.com/bitcoin-blockexplorer/insight_ui
https://github.com/bitpay/insight

Ethereum Blockchain and Smart Contract

Development Environment
Virtual Box
Install Ubuntu 16.04.3 (64bits)
Curl: sudo apt-get install curl
Npm: sudo apt-get install -y npm
Nvm:
curl -sL https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh -o install_nvm.sh
bash install_nvm.sh
source ~/.profile
nvm ls-remote
nvm install 8.5.0
nvm use 8.5.0
node -v
Chrome
Wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
Sudo dpkg -i google-chrome-stable_current_amd6.deb
Sudo apt-get -fy install
Atom IDE
Download from atom.io
Sudo apt-get install -f
Sudo dpkg -i atom-amd64.deb
Apm install language-ethereum
Metamask Chrome Plug-in: Search in google and add to chrome
Ethereum
Sudo apt-get install software-properties-common
Sudo add-apt-repository -y ppa:ethereum/ethereum
Sudo apt-get update
Sudo apt-get install -y ethereum
Truffle
Npm init -y -> package.json
Npm install -g truffle
Npm install -g ethereumjs-testrpc
Not support OS Ubuntu (fsevents 1.1.2)
Require OS: Arch or Darwin

Build Smart Contract
PET SHOP
npm install -g truffle
npm install -g ethereumjs-testrpc
truffle unbox pet-shop
truffle compile
Testrpc -p 8545
Geth attach http://127.0.0.1:8545
truffle migrate
npm run dev

Ref:
http://truffleframework.com/docs/getting_started/installation
http://truffleframework.com/boxes/
http://truffleframework.com/tutorials/pet-shop

Demo:
https://www.youtube.com/watch?v=lULuJt8Crdo

Get Bitcoin Blocks & Transactions

#!/bin/bash

#Get block json data from block id, ex: Block #300000
##for block_id in {START_ID..END_ID}
##do
	block_id=300000
	blockHash=`bitcoin-cli getblockhash $block_id`
	##echo "Block $block_id: $blockHash" >> blockHash.txt
	echo "$blockHash" >> blockHash.txt
	echo "Block $block_id: $blockHash" >> txn.txt
	echo "`bitcoin-cli getblock $blockHash`" >>txn.txt
	echo "" >> txn.txt
	echo "Block $block_id" >> allTxn.txt
	echo "`bitcoin-cli getblock $blockHash | jq '.tx'`" >> allTxn.txt
##done
	cat allTxn.txt | tr -d ']''['',''"' >> listTxn.txt

#Get transaction confirmation time
	block_hex_id=`cat blockHash.txt`
	echo "`curl -s https://blockchain.info/rawblock/$block_hex_id`" >> blockJSON.txt
	echo "`cat blockJSON.txt | grep '\"time\"'`" >> epoch_tmp.txt
	cat epoch_tmp.txt | tr -d '"time":'','' ' > epoch.txt
	block_time=0
	cat epoch.txt | while read epoch
	do
		second=`echo $epoch | awk '{print strftime("%c",$1)}' | awk '{print $3 ":" $4}' | awk -F: '{print ($1*86400)+($2*3600)+($3*60)+$4}'`
		#The first time value is the block creation time, the rest are transaction creation time
		if [ $block_time -eq 0 ]
		then
			time=$second
			block_time=1
		fi
		dif=$(($time-$second))
		printf '%02dh:%02dmin:%02ds\n' $(($dif/3600)) $(($dif%3600/60)) $(($dif%60)) >> Result.txt
	done
	rm allTxn.txt epoch_tmp.txt
exit 0

HyperLedger

https://hyperledger.github.io/composer/

Internet of Things

https://nodered.org/