The signed loan agreement, the bank's disbursement record, statements showing the investor received and then transferred the proceeds, the currency-conversion record, and the escrow or enterprise receipt establish the core source-and-path chain. The registered mortgage, deed and lender's appraisal can corroborate this secured transaction, but current policy does not make the farmland's entire acquisition history a categorical condition for contributed cash proceeds.
Follow the borrowed cash in one continuous chain
Start with the borrowing: provide the commitment letter and signed loan agreement, the bank's disbursement advice, statements showing the proceeds arrive in the investor's account, the currency-conversion receipt, and the transfer to the regional center's escrow or the new commercial enterprise. Those records should show that the investor lawfully received, owned and contributed the cash. Because this particular bank loan is secured on farmland, also retain the registered mortgage, deed and lender's appraisal to corroborate the bona fide transaction.
Under current USCIS policy, however, contributed loan proceeds are evaluated as cash, and there is no categorical requirement to prove the full historic source of the collateral merely because it secures the loan. If the lender or an intermediary is not a regulated bank, or the ownership and transfers are unusual, additional source evidence may be needed. Present the actual chain in a dated index so an adjudicator can follow every movement of the invested funds.