lnwallet+funding: sanitize upfront_shutdown_script #5369
Merged
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Otherwise, we would get non-standard txn's and fail to broadcast them when cooperatively closing a channel. This wouldn't affect funds security as no HTLCs would be active to steal. This is just a safety measure as we should only generate standard txn's.
BOLT#02: https://github.com/lightningnetwork/lightning-rfc/blob/master/02-peer-protocol.md#requirements-5