Good morning Pieter,

>4. Use cases

>

>* Replacement for Bitcoin Core's gettxoutsetinfo RPC's hash

>computation. This currently requires minutes of I/O and CPU, as it

>serializes and hashes the entire UTXO set. A rolling set hash would

>make this instant, making the whole RPC much more usable for sanity

>checking.

>* Assisting in implementation of fast sync methods with known good

>blocks/UTXO sets.

>* Database consistency checking: by remembering the UTXO set hash of

>the past few blocks (computed on the fly), a consistency check can be

>done that recomputes it based on the database.

Another use case I can think of is a potential "chain-flip" hard fork of block header formats, where the UTXO hash rather than merkle tree root of transactions is in the header, which would let lite nodes download a UTXO set from any full node and verify it by verifying only block headers starting from genesis.

Regards,

ZmnSCPxj