I have an Auction contract which has a function like this:

function bid() payable{
    //calculate and store highest bid value

But because each transaction takes time to mine, so when a user bids the highest amount, the highest bid displayed for other users takes time to be updated, which is undesirable because other users can't know what is the current minimum amount they have to bid to win.

So what should be a good solution to this problem? I thought of storing a highest bid variable in the server side that get updated whenever a user bids, but this could run into a problem when the transaction is canceled or violates something and reverted.


I hope you are storing the highest bid in your contract. In that case, you can handle this using your UI components. When someone places a bid you can show a loader, telling transaction pending verification and once the transaction is completed, you can display the success message as well as the then highest bid fetched from the contract.

The user(other users) can refresh the component to fetch the current highest bid from the contract before placing a bid herself. The fetching should be instantaneous. The placing of bid will take time to confirm.

You should not that in the ethereum world there is nothing that is instantaneous other than perhaps your local test network.

  • Problem is a user might wait forever to know the actual highest bid. For example: user A want to bid, but user B keeps on bidding 1$, 2$, ...(this could be multiple users keep on bidding). As it takes some time for each transaction to complete, user A will never know what is the actual highest value. – user10799255 May 20 at 6:45
  • But user A can instantaneously know, what is the current highest bid recorded in the contract as a result of a verified transaction. You can refresh the UI component when user A shows an intent to place bid. The bid which he is going to place is with similar knowledge to other users. All users who refreshed at the same time get the same result. – Sanjay S B May 20 at 8:50

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