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Overview

  • Each dutch auction lasts 420 blocks, starting at 1 ETH and ending at .001 ETH
  • Exactly one mint is allowed per auction (enforced by auctionMinted[id])
  • If a full auction passes and no brew is minted, a new brew is generated for the next auction
  • Every 10th token is auto-minted to owner() for the next auction and is ineligible for a minter minter reward. (but can later be chosen as the random-holder to receive a reward)

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Supply Cadence

Every 420 blocks, a new brew is available for mint. Each dutch auction begins at 1 ETH and decreases linearly with each block until it reaches 0.0001 ETH. 
/// dutch auction duration
uint256 public immutable AUCTION_INTERVAL = 420;

/// start and end price of every auction
uint256 public startPrice = 1 ether;
uint256 public endPrice   = 0.001 ether;
Helper functions in the contract are used to track auction progress and price information. 
/// find out when the current auction ends
function currentAuctionEndBlock();

/// get the current mint price
function getCurrentPrice();

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Minting Brews

Only one brew can be minted per auction. If a full auction concludes and no brew has been minted, a new brew is generated for a new auction. The token ID only increases when a brew is successfully minted. 
/// track which auctions have been minted
mapping(uint256 => bool) public auctionMinted;

/// find out if the current auction has been minted
function currentAuctionMinted();
Minting results in the current brew being created on the Ethereum blockchain. 
function mint()
Every 10th brew minted results in a bonus brew, which is sent to the owner() address. This mechanism was designed to ensure a meaningful supply of the collection accumulates in the custody of the contract owner over time.