Actually what you are saying isn't too far-fetched at all.
Think about how technology interacts with our emotions / heart rate and bloody pressure and how smartphones and fitness bands can detect increases in performance, activity and stress levels just by monitoring our movement and vitals?
Well as the blockchain is just a highly secure, independent method of storing reasonable (small in modern standards) amounts of data, then yes this information could be stored in a blockchain (not bitcoins though).
You'd also need to explore the suitability of the technology, and limitations. It could be more beneficial to build a scalable database which could be replicated easier and queried quicker / more efficiently rather than encrypting all the data in a blockchain.
As long as data is anonymous and not relevant to the people providing that data, it doesn't need to be stored in a blockchain. It could be though.
Scientists are saying it could be feasible to upload consciousness in the future, and I don't see any reason why emotion would not be included in that.