This depends on the actual configuration of the IBC. If You are a direct shareholder in the company (without using the nominee shareholding service), then Share Certificate(s) and an entry in the Register of Shareholders serves as your ultimate “proof of purchase”. If nominee shareholder is involved, then the clients` proof of beneficial ownership is confirmed by another legal document. It can be named several different ways: a declaration of trust, a deed of transfer, a nominee services agreement, a beneficial owner declaration. Regardless of the title, this document, signed by the nominees, will confirm in absolute certainty who the real owner of the offshore company is.