[00]field notesField notes.Product launches, engineering writeups, and the research behind what ships out of the lab.Product launchMay 21, 202612 min readIntroducing Replay: Solana mainnet, paused on a frame you can driveReplay starts from any mainnet snapshot, advances it slot by slot, splices transactions, patches accounts, and answers every read with JSON-RPC, WebSocket, and Geyser surfaces. The closest thing to a time machine for the Solana state machine — over HTTP or MCP.read post