This project is a collection of smart contracts used by Alice, a social impact platform built on Ethereum https://alice.si.

Alice has moved all modules to a monorepo at alice-si/monorepo. See you over there!

The first application launched by Alice uses smart contracts to implement a "pay for success" donation model, where donors only pay if the charitable projects they give to achieve their goals.

Each charity project encodes a list of "goals" that the charity aims to achieve, and each goal is assigned a price that the charity will receive if/when the goal is provably achieved.

Donors give to projects on the Alice platform using fiat, and the payment logic is implemented on the blockchain using a stablecoin token pegged to the value of their gift. When a donor sends money to a project, the corresponding amount of tokens is minted and credited by the Charity contract. These tokens are held in escrow until a dedicated Validator confirms that an expected goal pursued by the charity has been achieved. Once this validation has been performed, the price assigned to the goal is then transferred to the charity's account. If the charity does not achieve any goals, outstanding tokens are unlocked and returned to donors. They can then be reused for future donations.

This project requires node-js runtime and uses truffle as the Ethereum smart contract development framework.

In order to run it, install truffle first:

npm install -g truffle

Then install all of the node-js dependencies

npm install

Connection to blockchain node is defined in truffle.js:

networks: {
    dev: {
      network_id: "*",
      gas: 4000000,
      host: 'localhost',
      port: '8545'
    }
}

We recommend using popular Ethereum test client ganache as a default node:

npm install -g ganache-cli

To run all of the smart contract tests, use the following truffle command in your console:

truffle test

If you are using the testrpc client, remember to start it with a sufficient number of test accounts:

ganache-cli -a 100

You can also use an automated test script instead of the previous two commands:

yarn test

We created a demo dApp so you can interact and test the smart contracts in a visual environment rather than hacking console scripts. To run this mode, deploy the smart contracts to your blockchain network:

truffle migrate

... and then launch a demo server:

npm run dev

This demo dApp should be available at: http://localhost:8080/ and look like this:

All comments and ideas for improvements and pull requests are welcomed. We want to improve the project based on feedback from the community.

MIT License

Copyright (c) 2017 Alice Ltd. (Jakub Wojciechowski [email protected])

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.