Certification requirement for pre-funded instruments mandates bank-certified identity and an audit trail to ensure client-origin of funds. Where the aggregate daily value of pre-funded instruments per client meets the prescribed threshold, brokers may accept them only if accompanied by evidence identifying the account holder and debited bank account, certified by the issuing bank by means such as a bank certificate on letterhead, certified requisition slip, certified passbook/bank statement copy, or authentication on the reverse of the instrument; brokers must also maintain an audit trail for electronic fund transfers to ensure funds originate from their clients.