-When all participating traders have signed their inputs in the Batch Execution Transaction, the auctioneer can sign the final input and broadcast the transaction. This transaction can be large, and serve as the funding transaction for potentially hundres of channels! The participating traders only pay chain fees for their inputs and outputs in the transaction, so everybody is saving substantially on fees compared to individually funding channels. If the trader supports account autorenewal and the account was close to expire, its expiry height will be automatically extended after the batch is sucessfully executed.
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