$243.61 3.59%
ETH · 5w

With StarkEx Ethereum is ready for Reddit (1.3M demo users onboarded in 12 hour period, tx fee per user: 600 gas)

Doing the same thing directly on Ethereum (sans StarkEx), would have consumed the entire network for 4.5 days.

Motivation: Fuel Labs recently showed an impressive demo on a testnet: sending the initial balance of Bricks and Moons (Reddit’s new coins) to an Ethereum wallet. We decided to join Fuel Labs in sending Reddit a message from the Ethereum community: we are ready for you.

What We Did

We used StarkEx, our ZK-Rollup scalability engine, to set up 1.3M accounts and seed them with an initial balance. This onboarding is completely trustless: it is backed by a sequence of STARK proofs and state commitments to Ethereum Mainnet. StarkEx can be used for much more than this onboarding: it can also serve to scalably transfer tokens and trade them.

We minted on-chain 2^60 tokens of an ERC-20 we called MockErc20 and deposited them to a smart contract representing a subreddit. We then trustlessly moved those assets to the off-chain account of the “subreddit treasury”. Off-chain, we created 159 batches of 8,192 transfers each. Each batch represented transfers from the moderator’s account to a subset of individual account owners. For each batch we generated a STARK proof attesting to the integrity of the entire batch, and updated an off-chain Merkle tree of account balances. Each proof was then sent on-chain (in 13 separate tx, 380K gas/tx on average, for a total per proof of 4.94M gas), alongside a commitment to the updated state of the Merkle tree. Each single transaction costs 603 gas (4.94M gas/8192 transfers). In order not to burden Mainnet, already heavily congested, we submitted 2067 (13 times 159 batches) separate Ethereum transactions.

Operator account:

“reddit” account:

Deposit tx:

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