0g-chain/x/auction/spec/03_messages.md

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# Messages
## Bidding
Users can bid on auctions using the `MsgPlaceBid` message type. All auction types can be bid on using the same message type.
```go
// MsgPlaceBid is the message type used to place a bid on any type of auction.
type MsgPlaceBid struct {
AuctionID uint64
Bidder sdk.AccAddress
Amount sdk.Coin
}
```
**State Modifications:**
* Update bidder if different than previous bidder
* For Surplus auctions:
* Update Bid to msg.Amount
* Return bid coins to previous bidder
* Burn coins equal to the increment in the bid (CurrentBid - PreviousBid)
* For Debt auctions:
* Update Lot amount to msg.Amount
* Return bid coins to previous bidder
* For Collateral auctions:
* Return bid coins to previous bidder
* If in forward phase:
* Update Bid amount to msg.Amount
* If in reverse phase:
* Update Lot amount to msg.Amount
* Extend auction by `BidDuration`, up to `MaxEndTime`