Last run November 10, 2026

Don't trust us.
Run it.

Every number below comes from a test you can run on your own machine. The code, the tests and the page generator are in the download.

30rule-by-rule contract tests, all passing

1,040random market weeks, including -60% and +150%

32/32bugs planted on purpose, caught by the tests

46/46checks on the real site, clicking a full week

The rules that must never break

A renter can never lose more than the rentChecked on 5,970 random rentals. The price limit is enforced, and a gain is exact to the unit.

Every ticket is fully backed by sharesAt most 50% of the vault can be rented. Checked 4,160 times, at every step, through weeks from -60% to +150%.

Rent reaches owners, the fee reaches keys, in the same transactionClicked through on the real site: owners’ rent + keys’ fee = exactly what the renter paid.

Nothing disappears, nothing is createdAfter 18,888 random actions, everyone exits. Total shares and dollars match to the unit; what stays in the contracts is rounding only.

The contract owner cannot touch fundsThe full list of write functions is itself a test. A hostile owner maxes the fee, pauses rentals and zeroes the caps: owners still exit in full.

Keys have no adminThe staking contract has no owner. A fake vault cannot create rewards: only dollars that really arrived count, once.

We tried to break it

Chainlink changes feed version right after the close
Chainlink feed dies: the vault unlocks and owners exit
Endless oracle pause: Friday’s price still settles after 14 days
No usable Friday price: the week closes without gains after 21 days, never before
A price from another date cannot replace Friday’s
Robinhood changes the token’s code: settlement still works, rentals stop
Two vaults, one key: fees add up, vaults stay separate
Nobody staked yet: fees wait for the first keys
A week exactly on the +5%, +10% and +15% lines

32 bugs we planted to test the tests: 32 caught

Rent more than the 50% limitCaught
Raise the rental limit to 90%Caught
Rent outside the windowCaught
Ignore the renter's price limitCaught
Miscalculate the renter's gainCaught
Pay gains only if the price doublesCaught
Settle before FridayCaught
Settle with a price that is not the last oneCaught
Settle with a price that is too oldCaught
Use the late fallback without waitingCaught
Close the week without gains too earlyCaught
Make vault shares transferableCaught
Claim a ticket twiceCaught
Collect rent twiceCaught
Withdraw shares twiceCaught
Split the rent wronglyCaught
Set a fee above 30%Caught
Wrong vault entry priceCaught
Wrong vault exit priceCaught
Rent on a stale priceCaught
Rent during an oracle pauseCaught
Rent ahead of a stock splitCaught
Swap the staking contractCaught
Skip the key requirement for priority depositsCaught
Never release rental locksCaught
Withdraw more shares than you ownCaught
Make earnings weeks cheaperCaught
Announce fees never receivedCaught
Unstake keys without the 7 daysCaught
Collect key rewards twiceCaught
Withdraw keys twiceCaught
Recount rewards already paidCaught

On a copy of the real chain

The vault read the real Chainlink TSLA price ($378.58), and took in and gave back 10 real TSLA tokens, on a local copy of Robinhood Chain. Nothing was sent to the network.

Run it yourself

cd contracts
npm ci
npm test                        # contract and stress tests
node e2e/mutations.mjs          # plant the bugs again
npm i --no-save playwright-core
node e2e/app-e2e.mjs            # click a full week on the site (Chrome)

Download the code and tests

Or paste the contract into your AI of choice with the prompt on the site.

What this does not prove

The simulated figures are for Tesla. Every other stock has its own vault, the same formula and its own results. In simulation, some stocks did worse for owners or renters.
Tests have limits. These are our own tests. Passing them does not prove there is no bug.
Vaults not open yet. No renters yet, and no real rent has been paid so far.
The full week was run on a local chain. The real TSLA token was only tested for deposit and withdrawal, on a copy of Robinhood Chain.
Real wallets and phones have not been tested yet.
The $2,573 figure is a simulation on real Tesla prices, and assumes half the vault is rented every week. If nobody rents, there is no rent.
Outside our control: Chainlink, Robinhood and the USDG issuer can change or block their own contracts.

Fingerprints of the tested code

RentstockVault.solac14c8aa58154f8d00366446184e8f5ab33e600876f998671d6351158ec4b5b9

RentstockStaking.sol24684a626d8e0c71a89a986345b1e38e95e2675b549f15ddf35f11ce9b45d6f1

lib/RentMath.sol937e8b6843979719bc6e362fd56797bd81301ccff94d46387487a04738015b4f

lib/MarketClock.sol22c4342b0e62dfde4bbd973dc6f59cdbe939ac03d19b443084b7d62ccf67e489

Interfaces.sol8056626a10b2f9d92231301c36922fb55a03d8f4ff91e160d6fcac5f64a56572

SHA-256. When the contracts go live, compare them with the verified source on the explorer.

Don't trust us.Run it.