gavel — sealed-bid auctions nobody can rig

[ gavel ]

sealed-bid auctions nobody can rig · bids sealed until the hammer · losing bids never revealed

PUT SOMETHING UNDER THE HAMMER

second-price (Vickrey)the winner pays the second-highest bid — bidding your true value is the winning strategy first-priceclassic sealed tender — the winner pays exactly what they bid

hammer falls in reserve unit

bids live only in attested enclave RAM — nobody can read them before the hammer, you included: that's what makes honest Vickrey auctions possible at all
your reserve is blinded and committed as sha256(salt‖reserve) before the first bid exists — bidders can't even tell if one is set
at close, only the winner and clearing price are revealed; every losing bid is scrubbed from memory, never published to anyone
every bidder gets a fingerprint proof their bid was in the set the hammer weighed

THE AUCTION IS SEALED

your reserve (even "none") is already committed — the hash below was fixed before anyone could bid. share it so bidders can screenshot it now and check it against the reveal.

share this link with your bidders:

admin link — keep it private: it can close early, cancel, and read the result:

connecting…

reserve sealed at creation: sha256(salt‖reserve) =

DON'T TRUST THIS PAGE'S WORD FOR IT

the salt, the reserve, and every bid's fingerprint are public now. this button re-checks them with WebCrypto, in your browser:

NOTHING HERE

this auction never existed, or its record aged out (closed auctions stay checkable for 7 days, cancelled ones for 1). sealed bids from a vanished auction were scrubbed, not archived.