I'm not OP and I shake my head at the "blockchain will be the future of software!" cultists, but I can imagine storing hashes of private operations (just the hashes, not the data themselves) on data in a publicized blockchain, for auditing purposes.
So one can probably suspect that a business whose ledger is totally different to the publicized hashes might be laundering money. And to make sure the publicized hashes aren't faked in the first place, somehow one would need to combine it with the hash of a receipt.
Just thinking out loud: taxman-sanctioned smartphone software that takes as input the time, business ID, and the purchased products, and generates a hash as an output. A shopper can compare the hash to the hash on the receipt she got, and later on she can check if the hash is in the blockchain.
So one can probably suspect that a business whose ledger is totally different to the publicized hashes might be laundering money. And to make sure the publicized hashes aren't faked in the first place, somehow one would need to combine it with the hash of a receipt.
Just thinking out loud: taxman-sanctioned smartphone software that takes as input the time, business ID, and the purchased products, and generates a hash as an output. A shopper can compare the hash to the hash on the receipt she got, and later on she can check if the hash is in the blockchain.