[nemo1618]

Why on earth would you use IOTA for this? Even ignoring its ignominious history, the security paper itself acknowledges that IOTA currently isn't an "immutable ledger" at all:

>at the moment the log entries on IOTA will be deleted after a certain time and won’t be stored indefinitely on the ledger. Therefore, it is highly recommended to download the generated CSV files from time to time, which contain all the information about the logs. It is expected that the IOTA Foundation will release a solution for this problem in the coming month.

[Noc2]

The advantage of IOTA compared to for example OrbitDB is that you want some kind of proof of work for the metadata. Otherwise everyone can just create instantly millions of fake entries. However, regarding the mentioned snapshot problem, you can of course then create a simple copy of the IOTA tangle entries on orbitDB.