> They are interested in the fact that it is both decentralized and immutable So like https://ipfs.io/ https://ipfs.io/ or various other append-only logs? Or t

> They are interested in the fact that it is both decentralized and immutable So like https://ipfs.io/ https://ipfs.io/ or various other append-only logs? Or the certificate transparency project? The blockchain is the least efficient way to create a distributed append-only log if there are a fixed number of trusted actors publishing to it. Banks can far more easily publish append-only logs of transactions without the extra noise of "mining" and comparing longest chains based on proof-of-work.