A comparison of blockchain technologies for distributed voting
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Transcript of A comparison of blockchain technologies for distributed voting
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A comparison of Blockchain Technologies for distributed votingBlockchain Vlaanderen meetup #3 June 22th, 2016
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Before we start...
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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
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But this is just a simple case...
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Real life voting in Belgium
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Guarantee full anonymity
Requirements
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Guarantee full anonymity
Requirements
Required for each person of age
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Guarantee full anonymity
Requirements
Required for each person of age
Tallied the same day
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Guarantee full anonymity
Requirements
Required for each person of age
Tallied the same day
No physical location required
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Votes are registered in the chain, if the address can be linked to a person we fail the anonymity requirement.
Challenges
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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.
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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.
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So, how could we do this?
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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 !
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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
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A matter of scale
8.000.000 eligible voters
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A matter of scale
370 transactions/ second
8.000.000 eligible voters
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A large public network
Validators / Miners
A semi-private network with nodes at each political party, the EU, the UN, interested parties, ...
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Our options
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Network
Consensus
Transaction speed
Smart contracts
Largest public network
Proof of Work
7t/s limit = 13 days!
None
Bitcoin Blockchain with Colored Coins addon
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Network
Consensus
Transaction speed
Smart contracts
Private network
Configurable Proof of Work
200t/s = 11 hours
None
Multichain
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Network
Consensus
Transaction speed
Smart contracts
Public network
Proof of Work
20t/s = 4.6 days
Solidity
Ethereum
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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
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Network
Consensus
Transaction speed
Smart contracts
Public network
Proof of Importance
2t/s = 46 days
None
NEM
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Network
Consensus
Transaction speed
Smart contracts
Private network
Federation
100k t/s = 80 seconds
None
BigchainDB
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Network
Consensus
Transaction speed
Smart contracts
Private network
Practical Byzantine Fault tolerance
210t/s = 10h
Chaincode
Hyperledger
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Most secure
Fast enough
Smart contracts
Quite a conundrum
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A hybrid solution?
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Public Ethereum smart contract to assign address to voters
BigchainDB to process the votes
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Thank You
Roderik van der Veer
@r0derik
https://linkedin.com/in/roderik
+32 491 50 58 15