[indescions_2018]

Algorithmia also just launched its own smart contract for ML model validation. Two's a trend ;)

Trustless Machine Learning Contracts: Evaluating and Exchanging Machine Learning Models on the Ethereum Blockchain

https://blog.algorithmia.com/trustless-machine-learning-cont...

[tudorw]

and 3 is well... without mentioning the 'B' word, there is a very smart chap Feng He working on solutions to these problems, https://www.deepbrainchain.org/

[lowglow]

4 for it! Going to toss https://synapse.ai/ in there as well. :)