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Managed sponsored events through an Ethereum smart contract
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Sponsored Event

Create a sponsored event then manage funds and pledges through a smart contract.

This can be used to manage, collect and distribute donations for any kind of charity event – sponsored walk, climb, run, pogo-stick marathon, etc.

No more chasing people for money after the event. No need to worry about how or whether the money makes it to the charity.

This contract also allows cancellation and withdrawal from the event. In that case, the participant's initial sign-up fee is transferred to the receiving charity but any pledges are returned to the sponsor.

Additional information about the event (description, title, images) should be stored off-chain in another database.

NOTE: Don't actually try to use this yet. It hasn't had nearly enough testing yet to be trusted with real money.

Getting started

Install Truffle and Ganache CLI

npm i -g truffle ganache-cli

Start the development web server

npm run dev

Web App Structure

The web app uses web3.js to interact with the smart contract SponsoredEvent.sol. It can also interact with a separate content database to keep as much non-critical data off the blockchain as possible.

Structure of Web App

Key Concepts

The Event

An event for charity where someone must complete all or part of something. In exchange someone else pledges to give money to a recipient.

The Recipient

The charity or body receiving the funds at the end. They don't need to do anything except have an account capable of receiving the funds.

The Organiser

The person creating the event specifying the name, date, description and designating the account of The Recipient. This account is the owner of The Event.

The Participant

The person actually taking part in The Event. This person signs up for the event and commits to taking part. They are given a unique URL which The Sponsor can use to pledge money. Participants are charged a sign-up fee.

The Sponsor

The source of the funds. This party has promised to donate money to The Recipient if The Participant takes part in The Event. They can include a message along with their pledge.


If the event is cancelled, all pledged money is automatically returned to The Sponsor. Sign-up fees are returned to The Participant.


If The Participant withdraws, all money pledged to them is automatically available for The Sponsor to reclaim. The participant's sign-up fee is not returned.

Ending an event

The Organiser can mark an event as Ended. This will transfer completed pledges and sign-up fees to The Recipient.

Retrieval period

Once the event has ended, The Sponsor is able to reclaim any funds donated to Participants who did not complete the event. It is possible to implement push here so that funds are automatically returned but this carries risks as The Event may not have enough to cover the transaction fees. It's safer to implement a pull model here so that any fees are guaranteed to be covered.

Closing the contract

After a period of time following the end of an event, The Organiser will close the event. This will transfer any remaining balance to The Recipient.

Contract Lifecycle

Each Sponsored Event contract starts when The Organiser creates it and deploys it on the blockchain. From that point, The Participants can sign up and The Sponsors can make pledges.

Lifecycle of a deployed contract

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