ArbSys
Challenge
On an Arbitrum Orbit chain, the block your contract sees is not the block you think it is. Every contract written for Robinhood Chain has to know this before it ships.
Deposits from Ethereum confirm in about ten minutes over the canonical bridge.
- The testnet runs on chain 46630 with the same tooling.
- Withdrawals take a 45,818-block challenge period on Ethereum — about 6.4 days.
- The chain produces about ten blocks per second, and a block carries about eight transactions.
Gas is paid in ETH; the median base fee across the last twelve million blocks was 0.0225 gwei.
Solution
There is no token, no staking and no validator set: the bridge is Ethereum contracts.
Ninety-five tokenized US equities trade on the chain as ERC-20 tokens.
- Deposits from Ethereum confirm in about ten minutes over the canonical bridge.
- There is no token, no staking and no validator set: the bridge is Ethereum contracts.
- Thirty-four of the tokenized equities have their own Chainlink aggregator on the chain.
ArbSys at 0x…64 returns the chain's own height; block.number returns Ethereum's.
Every number on this page can be read back from the chain.
The canonical bridge is the trustless default; the other routes are listed separately and labelled as such.
ArbSys
DefiThe testnet runs on chain 46630 with the same tooling.