This slidedeck was used at the third Blockchain Vlaanderen meetup in Antwerp. It explores the currently available Blockchains and their capabilities within the context of voting in Belgium.

1. A comparison
of Blockchain Technologies
for distributed voting
Blockchain Vlaanderen meetup #3
June 22th, 2016

2. Before we start...

3. https://proofoflikes.be
Proof of Likes

4. Native mobile
applications
connected via
a REST API
Proof of Likes
Multichain
(multi asset
bitcoin fork)
Generates a
key pair for
each app and
issues 100
vote tokens
Full
transparancy
via the
Explorer

5. But this is just
a simple case...

6. Real life voting
in Belgium

7. Guarantee
full
anonymity
Requirements

8. Guarantee
full
anonymity
Requirements
Required
for each
person
of age

9. Guarantee
full
anonymity
Requirements
Required
for each
person
of age
Tallied the
same day

10. Guarantee
full
anonymity
Requirements
Required
for each
person
of age
Tallied the
same day
No physical
location
required

11. Votes are registered
in the chain, if the
address can be linked
to a person we fail
the anonymity
requirement.
Challenges

12. Votes are registered
in the chain, if the
address can be linked
to a person we fail
the anonymity
requirement.
Challenges
Only people who are
eligible are allowed to
vote, so the government
needs to send these
people a VOTE token.
Which links person to
an address.

13. Votes are registered
in the chain, if the
address can be linked
to a person we fail
the anonymity
requirement.
Challenges
Only people who are
eligible are allowed to
vote, so the government
needs to send these
people a VOTE token.
Which links person to
an address.
All eligible people are
required to vote, how
do we check this
without linking them
to an address.

14. So, how could
we do this?

15. First things first…
Paper letter with
a personal token Login to a portal
Generate a new
anonymous address
Issue a VOTE token
to that address
This action fulfils
the voting duty
requirement
National
Registry
! this portal knows exactly who you are and can link you to the address !

16. Smart contracts
to the rescue
• The smart contract is the only time, the login token and the generated
address ever meet.
• The smart contract code can be verified on the blockchain. We can be
certain that it is does not store anything except a login code being used

17. A matter of scale
8.000.000
eligible voters

18. A matter of scale
370
transactions/
second
8.000.000
eligible voters

19. A large public network
Validators/Miners
A semi-private network with
nodes at each political party, the
EU, the UN, interested parties, ...

20. Our options

21. Network
Consensus
Transaction speed
Smart contracts
Largest public network
Proof of Work
7t/s limit = 13 days!
None
Bitcoin Blockchain with
Colored Coins addon

22. Network
Consensus
Transaction speed
Smart contracts
Private network
Configurable Proof of Work
200t/s = 11 hours
None
Multichain

23. Network
Consensus
Transaction speed
Smart contracts
Public network
Proof of Work
20t/s = 4.6 days
Solidity
Ethereum

24. Network
Consensus
Transaction speed
Smart contracts
Private network
Configurable Proof of Work
in theory 370t/s ~ in reality 20t/s
= 4.6 days
Solidity
Private Ethereum

25. Network
Consensus
Transaction speed
Smart contracts
Public network
Proof of Importance
2t/s = 46 days
None
NEM

26. Network
Consensus
Transaction speed
Smart contracts
Private network
Federation
100k t/s = 80 seconds
None
BigchainDB

27. Network
Consensus
Transaction speed
Smart contracts
Private network
Practical Byzantine
Fault tolerance
210t/s = 10h
Chaincode
Hyperledger

28. Most secure
Fast enough
Smart contracts
Quite a conundrum

29. A hybrid solution?

30. Public Ethereum smart contract to
assign address to voters
BigchainDB to process the votes

31. So what do
you think?
https://proofoflikes.be

32. Thank You
Roderik van der Veer
@r0derik
https://linkedin.com/in/roderik
+32 491 50 58 15