Storage

In Solidity, a Dutch auction commonly stores auction data in a mapping owned by the contract.

Solidity

struct Auction {
  IERC20 buyToken;
  uint256 maxPrice;
  uint256 minPrice;
  uint256 duration;
  uint256 startedAt;
}

mapping(uint256 => Auction) private auctions;

Move object-based design

On Aptos, Objects are the preferred container for app-owned state.

For this example, think in terms of three entities:

1. a collection object
2. a token object for the asset being sold
3. an auction object holding the auction resource and transfer configuration

This gives you:

• explicit addresses for auction instances
• cleaner grouping of related resources
• compatibility with Digital Asset and Fungible Asset standards

The migration habit to learn here is that many Solidity mappings become either:

• user-owned resources
• object-owned resources
• framework-standard stores

not custom contract slots.