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Deploy missing Squidrouter relayer contracts
Make monerium vs mykobo flows distinguishable
Reject registerRamp if any required ephemeral has on-chain history on a route-relevant chain (non-zero nonce/balance on Substrate/EVM, or a pre-existing Stellar account). Without this, the backend builds presigned transactions assuming nonce 0 and the ramp halts mid-execution after subsidies have already been spent. Route-to-network mapping mirrors the offramp/onramp transaction-builder dispatcher so only chains an ephemeral actually signs on are checked. Fails closed on RPC errors (SERVICE_UNAVAILABLE) since freshness cannot be presumed without on-chain data.
Add EphemeralNotFreshError and EphemeralFreshnessCheckError so partner clients can distinguish stale-ephemeral failures from other registerRamp errors and recover by retrying (the SDK regenerates ephemerals on every call). Document the retry pattern in the SDK README.
Add F-068 to FINDINGS.md (Medium, fixed), extend the ephemeral-accounts spec with invariant 9 + threat row + audit checklist item, and add invariant 10 + threat row + checklist item to transaction-validation.
1. EVM freshness now checks both nonce AND balance (not just nonce), rejecting addresses that received native funds but never sent a tx. 2. Use sandbox-aware Polygon network (PolygonAmoy when sandboxEnabled) in the freshness mapping, matching the transaction builders. 3. Error middleware now only masks 500 messages in production, preserving 503 SERVICE_UNAVAILABLE messages so the SDK can parse freshness errors.
Add fresh account check
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