NIST has a really good document, Blockchain Technology Overview (NISTIR 8202):
* https://csrc.nist.gov/publications/detail/nistir/8202/final
Chapter 8, Application Considerations, has a good yes/no flowchart that asks a series of question before saying "maybe Blockchain"
* Do you need a shared, consistent data store?
* Does more than one entity need to contribute data?
* Data records, once written, are never updated or deleted?
* Sensitive identifiers WILL NOT be written to the data store?
* Are the entities with write access having a hard time deciding who should be in control of the data store?
* Do you want a tamperproof log of all writes to the data store?
If the answer to any of the above questions is "no", NIST suggests something else.