You will receive proof of voluntary consent by using

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To ensure this, your online forms should have a checkbox with a declaration of consent. In addition, this should be described and listed in the data protection information.

double opt-in procedure - a mechanism in which the gambling data canada consent of the data subject to data processing is obtained twice and thus reliably confirmed .

GDPR and email marketing - Element 5:
Enable data transfer
The GDPR allows the processing of personal data in a machine-readable and structured form, which is done with consent or based on legitimate interest.
The fact that this data is available digitally is an implicit fact, which also enables it to be transferred to others.

This transfer can be helpful for those affected - for example, if they change provider. According to the GDPR, it can be requested from the data provider/contact at any time.
Therefore, make sure that your system is equipped for this possible data export.