Mine a HashFly
Your browser hashes until one result lands below the target. Almost all of them are above it and get away. The one that is not buys you a fly — and what that fly looks like is settled afterwards, by the contract, out of the hash and the minute it arrived in.
Fly #1 goes to the first hash that lands under the target. Your address is hashed in, so nobody can take that solution from you.
The shape above is one average fly at the epoch‑0 floor — 26 doublings of work, every floor twice the one below it. Your own attempts take its place the moment the miner starts.
8 flies until the floor rises one bit and every search doubles with it.
About 67.1M hashes per one fly kept, at the epoch‑0 floor.
Hash of a recent block, read through the EIP‑2935 history contract. Valid for a 256‑block window (about 128 s), and your address is part of the work — and Arc has no observable mempool to copy a solution out of.
Measured hashrates will be published from the public beta, on named hardware. No performance figure is claimed here before it has been measured.