Can you accept any entry with out a verifiable object? If you can, how you can assure it is trustworty?

All entries are to be supported by relevant vouchers.

The following are the some of the examples of vouchers:

 Receipt obtained from a payee. 

Counter foil of a receipt. 

Purchase invoice. S

ales invoice. Cash memo. 

Bank pay-in-slip.

A contract or an agreement.

A resolution passed at the meeting of the board of directors.

Minutes of a meeting.

Bought notes.

Sold notes.

Debt note.

Credit note.

Wages sheet.

Salary register

Goods inward book.

Goods outward book.