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Three months after mainnet launched, Vitalik deployed an advertising auction system to Ethereum. Eight ad slots, four auction mechanisms (one-phase winner-pays, cumulative, sealed-bid first-price, sealed-bid second-price), all managed by a factory contract called adStorer from ethereum/dapp-bin.
I matched the deployed bytecode to source through compiler archaeology. Exact match, 8,752 bytes, solc v0.1.1. Then I decoded every transaction across all 8 child auction contracts.
The only bidder was Vitalik himself. Two wallets (his old deployer and what’s now vitalik.eth), 229 transactions, 0.064 ETH in bids. The winning “advertisements” were two image URLs: me.jpg (a photo of himself) and heiko.jpg (a photo of Heiko Hees, who was building pyethereum). Both are 404 today.
Some details:
Slot 5 is a second-price sealed-bid auction. vitalik.eth bid 0.0005 ETH, his old wallet bid 0.0003 ETH. Second-price rules made vitalik.eth pay the runner-up’s price. The first Vickrey auction on Ethereum selected a photo of a pyethereum developer over its own creator.
Gas cost more than the bids. Vitalik burned \~1 ETH on gas (at 60 gwei, hard-coded in his deploy script) to move 0.064 ETH through the auction mechanics. At October 2015 prices, the whole experiment cost about $2.
Slot 1 was a stress test. 159 transactions, with Vitalik rebidding the same 0.0001 ETH increment 19 times in a row to validate cumulative bidding.
Three of the four all-pay auction variants got zero bids. He abandoned the one he tried before revealing. Even Vitalik didn’t trust his own all-pay math.
The sealed-bid auctions had a frontend bug where bid hashes were passed as ASCII hex instead of raw bytes, making commitments readable in calldata. Didn’t matter since the only participant wrote the code.
0.029 ETH (\~$70 today, $0.03 in 2015) is still locked in the child contracts from unrevealed sealed bids.
This was deployed three weeks before DevCon 1, on a network with maybe a few hundred users. A mechanism design experiment that nobody participated in except its creator, preserved on-chain for ten years.
I checked the Wayback Machine for the ad images. The closest capture of vitalik.ca/files/ is from June 2016. Neither photo was archived.
Full documentation with verified source, decoded bids, and all 8 slots mapped: https://ethereumhistory.com/contract/0xaf0334bf30c401b7e3afafbac1dbcdc712be8b9e
This is part of the EthereumHistory project where we’re documenting and verifying the earliest Ethereum contracts. If you want to help, the project is open.

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