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World’s first large scale blockchain based political election held on Zcoin’s blockchain

Nov 13, 2018 · 4 min read
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Over the period of 1st to the 9th of November, some of you have noticed that we had a huge surge in transactions, with hundreds to thousands of transactions being posted each block on Zcoin’s blockchain. We are now finally able to reveal what these transactions were. In fact this was hinted back in October with Mr. Korn Chatikavanij, former Minister of Finance revealing that political parties in Thailand have started using blockchain technology to select party leaders.

The Thai Democrat Party, Thailand’s oldest political party, recently held a primary election to elect its new party leader. In the past, the party leader was selected by the party’s MPs and the party chairman. With the primary election, all Democrat party members were eligible to vote and it represents the first time a Thai political party has selected its head with input from the grassroots.

The vote was concluded with a total of 127,479 votes that came from all over Thailand and to the best of our knowledge we believe this is the world’s first application of blockchain technology in a political election of this scale with other earlier votes on the blockchain being more of small scale test runs or with limited take-up rate or simply didn’t happen at all.

This leadership race had unique circumstances where the stakeholders wanted to be certain that votes were not tampered with. Most e-voting systems rely on a the use of a database that is controlled by an administrator. The stakeholders were unwilling to rely on this and as such it was agreed to use Zcoin’s public blockchain which had no administrator. The election mechanism, along with the source code to enable the elections was agreed by all the candidates and vetted by their IT advisors and also approved by the Democrat Party Electoral Commission which is supervised and reports to the Thai Election Commission.

The electronic voting took place via two methods: through voting stations nationwide utilising a Raspberry Pi based system and alternatively a mobile voting app called D-Elect that required voters to submit their photo ID.

There were two sets of data involved: identification documents and voting tallies. These data sets were encrypted and stored on IPFS, a decentralized and distributed file storage system. The IPFS hashes were subsequently then stored on the Zcoin blockchain, which acted as a decentralised immutable database while retaining auditability to the Electoral Commission and the Democrat Party candidates.

For those curious, this is a sample IPFS entry.

The voter tallies and identity documents were encrypted in a way that protected voter privacy. The encryption keys were split using a cryptographic method called Shamir’s Secret Sharing Scheme to ensure that not a single entity can decrypt the full set of voting data without the agreement and presence of all the stakeholders:

  • The voter identification documents can only be decrypted by a member of the Electoral Commission or a representative of the Democrat Party for the purpose of verifying the eligibility of voters.
  • Voting data can only be decrypted if all five parties — three representatives of each candidate, the Electoral Commission and the Democrat Party — are present and in agreement.

The voting data or identification documents on their own, read without the other are insufficient to reveal how a voter voted.

At the conclusion of the vote, despite the large amount of voters from all over Thailand, the final results were available in just under 12 hours. We are extremely proud to have played a part in enabling blockchain based e-voting to gain real world adoption and learnt many important lessons while carrying it out.

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Despite the many challenges of e-voting, we believe it is important to pursue such endeavors to make voting or polling easier, cheaper to carry out and most importantly trusted by the voters. In this case, blockchain was a good fit, with the stakeholders emphasis on the integrity of the vote database with no central administrator and also it being technology that they could understand and accept. We look forward to improving the system further such as the use of zero-knowledge proof systems in facilitating anonymous but verifiable voting on the blockchain.

Disclaimer: Zcoin does not endorse any political party and believes in the use of its technology in empowering personal liberties and democracy.

Originally published at on November 13, 2018.

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