This question is about one of the applications of the Blockchain in Artificial Intelligence. I am not very familiar with Natural Language Processing and I see that there is a Blockchain platform named "Graphgrail" to employ Blockchain for NLP and AI.

In its whitepaper is mentioned that:

7.1 WHY DO WE NEED BLOCKCHAIN AND TOKENS:

Provision of the possibility of using data on a platform with mutual benefit for the owner (?) and buyer (?). The Token allows the platform to hash in the blockchain platform the users and the results that they receive when training a neural network, downloading and / or spacing data. This allows other users, with the permission of the owner, to analyze the usefulness of the data or the trained models, use them and leave comments about the quality of the decisions applied. On the other hand, thanks to the protocol, users have the opportunity to monitor hashes to their blockchain at any time and receive an appropriate reward for their work, which they themselves will assign. This guarantees both parties the desired benefits.

It's not yet clear to me HOW exactly blockchain can help the user for an NLP operation?

What does mean : "The Token allows the platform to hash in the blockchain platform the users and the results that they receive when training a neural network" ? And what is the advantage of hashing the users and their results? (Is it for data integrity?)

And who is "owner" and who is "buyer"?

And do you think in general is it logical to employ blockchain for NLP? and if so, is there an example?