Social referral marketing platform Grabbr has launched a blockchain-based ledger to transparently track key events.

Based in Franklin, Tennessee, the company offers rewards to users who share marketing content via email, social networks or SMS. Its platform was launched in January.

In a typical use case, CTO Eric Ramos told me, a marketer sets up a campaign in the Grabbr dashboard so that users “share this to get that.” The marketer identifies the material to be shared, as well as the reward, which might be a free digital copy of a book,

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