This repository provides an example of a contribution campaign/token sale conducted on top of aeternity blockchain.

The tokens examples are following the AEX-9 standard for fungible tokens on aeternity.

The token-sale.aes contract is implementing the interface of an aex9 fungible token. Since we only need to call entrypoint mint() in order to issue new tokens for people that contributed to the campaign we are only using this interface:

contract FungibleTokenFullInterface =
  entrypoint mint                 : (address, int)          => unit

The contract also has few more functions - contribute, set_token and withdraw which respectively do the following:

set_token - this should be called in order to specify the address of the token contract which would be issued during the contribution campaign.

contribute - allows people to send value in AE tokens and calls the mint function on the specified token contract in the state of the contract, issuing new tokens amount according to the price ratio speicified in the token sale.

withdraw - allows the owner of the token-sale contract to withdraw the collected amount of AE.

This is a slightly modified version of the mintable aex9 contract. The difference is we have specified a new role - minter who is allowed to issue new tokens, increasing the total_supply.

In this case the minter is our token-sale contract.