We at Nydegger consultants made some tests to attach an independent appraiser certificate, stored with the IPFS protocol, along every digital asset we issued on the RVN blockchain. Every asset representing a jewelry piece of our customer.
https://medium.com/@tronblack/ravencoin-proof-of-promises-d603f3e04b8f
More infos on our project at www.gems4btc.bit/
Eric
Posted from my blog with SteemPress : http://nydegger.biz/use-ipfs-data-strorage-with-raven-coin-protocol-rvn-2/