Blockchain can mean almost anything these days. What exactly is the technology behind this “ledger that can never be erased or rewritten”? Is it like the BTC/ETH public blockchains? Or is it a database protected with digital signatures? Is it truly distributed across multiple nodes voting on consensus (consensus of what by the way) or it is a regular distributed file system? Around the world entrepreneurs use the term “blockchain” without precision, shamelessly attracting attention and capital.
Regular security applications need to take care. “Immutability” never was a requirement until Bitcoin came along. Government registries need to be adequately tamper resistant of course, but true immutability is irrelevant in regular file management where mistakes are routine and editing is normal.