1. Blockchain Infrastructure for e-Science http://ebloc.org
Can Özturan
Dept. of Computer Engineering
and TETAM
Bogazici University, Istanbul

2. Objective of the talk
Invite to collaborate on building a blockchain infrastructure for e-Science based on the open source Ethereum Smart Contract Platform

3. Blockchain Technologies
Peer-to-peer infrastructures (Bitcoin, Ethereum,..)
Decentralized trustless protocol
No need for central authority
Incentive driven ecosystem
Maintains a ledger (blockchain) of transactions among a distributed network of computers
Based on cryptography which allows secure transactions to be performed by the users
Solves double spending problem
Employs consensus algorithm for reaching consensus about the current state of the blockchain
Value/tokens/ownership can be tracked and exchanged without requiring a central point of control
Nodes (miners) verify transactions. They perform proof of work. In return, they win rewards and collect transaction fees.
51% attack may occur if 51% of hash power is held by one party.

4. TRADITIONAL SERVICES
servers
Users/programs

5. BLOCKHAIN CAN ALSO BE VIEWED AS AN OPEN, HISTORICAL AND LIVE DATABASE
servers
BLOCKCHAIN
Users/programs
blocks appear roughly every secs on ethereum

6. Blockchain for E-Science
Cluster computers, data, sensors, software, researchers, organizations, centers
etc. can be represented as a contract entity on the blockchain
BLOCKCHAIN
data
user
user
user
user
user
cluster
sensor
cluster
cluster
cluster
cluster
software
Center A
Center B
Center C

7. A simple smart contract example (example not tested, correctness not verified)
pragma solidity ^0.4.0;
contract ClusterMachine {
address public owner;
mapping (address => uint) public balances;
uint public totalcorehours ;
modifier owneronly {
if (msg.sender != owner) {
throw ; }
_ ;
// constructor
function ClusterMachine() {
owner = msg.sender ;
totalcorehours = 365*24 ;
function assigncorehours(address addr,uint
numcorehours) public owneronly {
if (totalcorehours >= numcorehours ) {
totalcorehours -= numcorehours ;
balances[addr] += numcorehours ; }
function getcorebalance(address addr) public
returns (uint retval) {
return(balances[addr]) ;
function transfer(uint amount, address dest)
public {
if (balances[msg.sender] >= amount ) {
balances[msg.sender] -= amount ;
balances[dest] += amount ;

8. Aim: Build a Blockchain Infrastructure for e-Science
Have each center / university / group / person run a single node
Use open/free source Ethereum code (geth, parity)
Even a cheap desktop can be used for running a node
Overall, we need many nodes (a few hundreds, the more the better). So we need to convince a few hundred researchers, universities, centers to run a node.
Almost no money needed for investment (an unused desktop can also be used).
But, in return we get a highly valuable blockchain infrastructure on which we can easily implement many useful things: auditing, evaluation, resource managers, sharing economy, virtual organizations, citation networks etc.
Blockchain can also be viewed as an open historical and live database: Data analytics can be performed on this live data.
It can complement existing European efforts and help these efforts to get more widespread adoption, e.g. by facilitating communities that always exist on the blockchain.

9. eBloc ( http://ebloc.org )
Please join our efforts to build a blockchain infrastructure for eScience by running a node
Contact: