If the group of agencies is relatively small, this can be done just fine by having all the entities sign each change in state, no need for blockchain. (And if

If the group of agencies is relatively small, this can be done just fine by having all the entities sign each change in state, no need for blockchain. (And if one of the agencies has the ability to acquire more computing power than the others are currently contributing to the blockchain - which is almost always true in this era of cloud computing - they can attack the blockchain just fine. Yes, it will be "obvious" in that it won't match anyone else's records, but the whole point here is that you're not trusting the majority's records, you're trusting the blockchain, right? Who is to say the majority are not lying?)