Digital advertising is a massive industry, but it is also plagued by issues such as fraud, lack of transparency, and poor data privacy.

Blockchain could be used to address these issues and create a more efficient and effective advertising ecosystem.

For example, blockchain could be used to create a decentralized ad network, where advertisers and publishers can interact directly without the need for third-party intermediaries.

This could lead to more accurate data and metrics, as well as better targeting and measurement.

Additionally, blockchain could be used to create a more transparent and accountable system for ad spending and budgeting.