- Uint8Array ret = bindings.TrustedClosingTransaction_sign(this.ptr, funding_key, funding_redeemscript, channel_value_satoshis);
+ Uint8Array ret = bindings.TrustedClosingTransaction_sign(this.ptr, InternalUtils.check_arr_len(funding_key, 32), funding_redeemscript, channel_value_satoshis);