Build and independently review Sealed Bid Auction: token Bid (BID) and contract SealedBidAuction, where a seller lists an item id with a reserve and a deadline; bidders commit a hash and lock BID, reveal after the deadline, the highest valid revealed bid wins and pays the seller, and every other bidder withdraws their lock.

Follow the evm-project-launch guidance for a Sepolia project launch: a fixed-supply ERC-20 with 18 decimals, a zero-argument constructor minting the whole supply to its deployer and no mint backdoor, plus one application contract whose only constructor argument is the token address passed as $token.

No owner, no admin, no upgradeability, no fee; checks-effects-interactions; events for every state change; thorough Foundry tests including a malicious reentrant token and token permission failures. The manifest names the token and the contract with the $token argument. Independent review before deployment.

Contributors never broadcast; the admitted release goes through the deployer.