{
  "code": 2004,
  "slug": "E2004",
  "category": "storage",
  "what": "manifest commit rejected (E_COMMIT_EXPIRES_EPOCH_WINDOW): {detail}",
  "fix": "Derive expires_epoch as block_height / storage_epoch_blocks, using the length this chain's /chain-info publishes for its chain_instance_id (never a compiled or cached copy), and keep it within [current_epoch, current_epoch + MAX_COMMIT_STAGE_TTL_EPOCHS]; the receipt's detail carries both sides' numbers so a client/chain epoch skew is visible without node-log access.",
  "docs_url": "https://docs.cowboy.inc/errors/E2004"
}