The Meta

The Meta is BLCK's model of sequencer-edge engineering on Robinhood Chain: how the chain orders transactions and where the edges are. One sequencer, run by Robinhood, orders strictly by arrival time. There is no public mempool, no priority auction, and no protocol-level way to pay for position. Today that removes most of what searchers on other chains spend their time on and leaves one thing: reach the sequencer first with a transaction that already does everything it needs to do. The discipline is named for the sequencer rather than for FCFS because it has to survive a rule change. If Robinhood adds a priority auction later, a bid becomes a second variable next to arrival time, and the measurement, simulation, and execution work stays. 02, 03, and 04 each say what would change. Every claim in The Meta traces to STATUS.md in the repo, which is verified against live RPC, the L1 contracts, a raw feed capture, and the official docs. Where something is inferred rather than published, The Meta says inferred. Where something is unknown, it says unknown.

The six documents

1. How sequencing works on Robinhood Chain. One sequencer ordering by arrival, no public mempool, what the feed and the dedicated submission endpoint are for, block cadence, the finality ladder, force inclusion at 4 days with a caveat, the Sept 4, 2026 blob-posting gap during which L2 blocks continued, the single point of failure, and the sequencer's region as an inference.
2. No priority auction, no way to pay for position. What does not exist on the chain, what "atomic" means when you cannot group transactions, Timeboost as an Arbitrum One feature rather than a Robinhood Chain one, what BLCK would do if that changed, and third-party private submission layers.
3. The Edges. What pays on a strict FCFS chain, venue by venue: latency, cross-pool arbitrage across Uniswap v2, v3, and v4, liquidations on Morpho Blue, the chain's liquidation venue, launch sniping on Pons, and stock-token gaps against the Chainlink US equity streams that run 24/5 and report Closed on weekends. Each edge names its BLCK module and what would change if a priority auction landed.
4. Robinhood Chain vs Solana and priority auction chains. Robinhood Chain against Solana and against Arbitrum One with Timeboost, a translation table for people arriving from Solana, and what changes if Robinhood adds an auction later.
5. Gas and fees. ETH as the gas token, the L2 basefee floor and one observed reading, the L1 data component, why the priority fee has no ordering effect, what to set for maxFeePerGas in a latency race, and gas as the cost of spam strategies.
6. The Stack. The Rust searcher stack and why each piece is there: the crates, Foundry, the feed decoder, endpoints, environment variables, a module-to-stack map, and why the safety model is a fork rather than a test chain.

Read this first if you come from Solana

Start with 04. It is the only document in BLCK that discusses Solana, and it maps what you optimized there onto what exists here. Most of it maps to arrival-time latency and single-call atomic strategies. Some of it maps to nothing, and the document says so rather than inventing an equivalent. Read it before 01, because otherwise 01 will read as a list of missing features instead of a description of a different game.