The first strong reason is because Trade Financing is self liquidating meaning repayment come from underline Transactions itself. For eg: Pre Shipment financing under LC will be liquidated from the proceeds of Post shipment financing or after paid by the issuing bank. So Trade Financing is less risk...

If required signuture verification, then there is somthing to be verified against something ie: signature on Inspection Certificate must be verified against signature on hte passport or on the Resident Identification card otherwise it could be fraudulant if someone just verified it without supportin...

In accodance with ucp600, you can discount as a nominated bank. Agree to advance or Purchase is allowable however it is your business decision whether you want to take the risk or not.

You as issuing Bank have to decide. As you mentioned that documents were presented earlier and you have advice discrepancy to Negotiating Bank, then you have to approach the applicant whether they accept dthis discrepancy or not and if they accept it then you may consider to pay negoatiating bank.

Sight draft in case is juast a simple receipt and a proved that beneficiary has claim to the applicant. If they mentioned specific date or maturity date in future then it is agreement between Beneficiary and the Applicant and it does'nt contradiction with sight draft.