On the inside and the outside.One of the tools that allows people to bid on auctions online is the e-auction. To facilitate transactions between buyers and sellers in the event of a hidden bid, third parties may be required to pay higher costs. However, you should be aware of the risk of being misled by unreliable sources. An auction's administrator or owner may have unfettered access to the sale when it's hosted on a decentralized platform. A blockchain-based asset's smart contract takes over as owner and oversees the bidding process when it goes up for auction. In this study, we created an Ethereum blockchain-verifiable smart contract for sealed-bid transactions. In a sealed-bid auction, all participants remain anonymous and just one bid is accepted from each buyer. A winner is determined by the largest amount offered in the proposals. Before the auction is over, a bid can be retracted. The buyer will be given a second chance to place a bid in this scenario. This implementation of the smart contract is analogous to a sealed bid in that it reveals just the highest bid. Participants in the bidding process are not given any more information.