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DGTX Treasury Sale

100M DGTX tokens are to be sold according to the following schedule:

  • Split into ten phases 10M tokens each
  • The first phase starts at 14.00 GMT, March 1, 2019 and then one every 3 months

Solidity implementation

The whole system consists of three contracts:

  • Whitelist
  • Treasury
  • Sale

Whitelist contract

Because of KYC requirements, Whitelist contract was added. It holds a list of approved addresses. It provides functions to modify this list (called by address listed in admins mapping, only owner can modify admins mapping) and checks if an address is allowed to participate (available to everyone).

Treasury contract

This contract holds tokens and releases them (sends to the Sale contract) according to the specified schedule: when new phase starts anyone can call this contract’s function and send 10M tokens to Sale contract.

Sale contract

This is a simple Ownable contract that sells all DGTX tokens it possesses. Anyone who passed KYC (address that is added to Whitelist contract) can buy tokens from this contract at the current rate. Rate is the amount of tokens that can be bought for ETH. Rate delimiter is 1000 (i.e. rate should be divided by 1000). The owner can update rate, though with some limitations to prevent front-running (like “new price become active in 15 minutes after update”). Current rate can be gained from currentRate() function call.

Minimum purchase amount is 1 DGTX, maximum amount per phase is 1 000 000 DGTX. Amount available for addr address for purchase in the current phase can be gained from availablePersonal(addr) function call.

Whitelist maintenance

Users added to admins mapping of Whitelist contract will ask every approved investor for their Ethereum address and add it to Whitelist contract in order to restrict access for some investors.