A continuous documentary chain from the origin of each dollar to the enterprise: corporate financial statements and resolutions for company money, sale and tax documents for the donor's property, gift instruments, bank records for every transfer, and any exchange or transmission records where currency or institutions change.
Build a chain that a stranger can follow
Hypothetical example: Hartley would fund an EB-5 investment from his Callander company's retained earnings and a family gift. The standard to aim for is that someone with no knowledge of the family can read the file from beginning to end without being asked to assume anything. For the corporate portion that means the company's financial statements, the resolutions authorizing a dividend or repayment, the resulting tax slips or filings, and the bank entries showing money leaving the company and arriving in Hartley's personal account.
For the gifted portion it means his mother's purchase and sale documents for the property, the closing statement, evidence of any mortgage discharged, her tax filings for the year of sale, statements covering the intervening period, and the transfer into his account. Every conversion of currency and every intermediary institution adds a document. Translations must be complete and certified where anything is not in English.
The workable method is to build the chain backwards from the enterprise to each origin, listing missing documents as they appear, rather than forwards from memory, because memory produces a narrative while the file needs records.