From what I understand of mimblewimble is there are no records kept
There are no records kept in the *blockchain*. But every full node receives all the intermittent states of each transaction, and there is nothing stopping them from logging that information. It requires some credulity to think there are no interested parties who have logged Grin from the genesis block.
A self-pruning blockchain does not equate to a fungible blockchain.
Thank you Joroz for pointing that out.
So although at any point in time a MW chain would be forensically impossible to analyze it can be assumed that that information (that is not stored in the chain but is accessible and collectable at the time of a transaction) has already been cached by TPTB and I'm sure any others wishing to sell that info in the future.
Is that safe to say?