The podcasting industry continues to explode with potential for advertisers, and the numbers show it: Marketers spent $479 million on podcast ads in 2018, and podcast advertising revenues are projected to surpass $1 billion by 2021, according to figures from the Interactive Advertising Bureau (IAB) and PwC.

Podcasts still have a ways to go before catching up with traditional radio. As marketers try to reach the growing audience of digital audio listeners, podcasts stand out in a few key ways.

The podcast ad market is taking off as people increasingly tune in. But large brand advertisers still want better measurement and analytics before they really buy in.

Blockchain’s distributed ledger could potentially revolutionize digital advertising. But advertisers are cautious about whether the emerging technology will improve things.

Although it receives constant buzz, there are a few reasons why blockchain isn't widely adopted yet.