I have attached a link below of a very informative guide to gold backed cryptocurrencies. A very good descriptor on what to look for and where various coins are in their development, ICO (Intial Coin Offering or PP), Exchange listing and coins in the graveyard.
Gold Backed Cryptocurrencies There are approx. (5) coins in their ICO stage - Not Metalstream
There are approx. (40+) coins in their Exchange Listing stage - Not Metalstream
There are approx. (20+) coins in their Development stage - Metalstream
There are approx. (24) coins in their unknown stage - Not Metalstream
There are approx. (25) coins in the graveyard - MSGOLD Metalstream's first attempt at a token is listed here.
The one thing that alot of people have shown concern for is the ability to see (at any time) the physical gold being held to back the token. The article references on several occasions the importance of its validation, audited, vaulted state. I have also attached a clip from Metalstream's development stage that clearly states the 2800kg's of initial gold is from the Forward Purchase Agreements in place.
MetalStream
Name: MetalStream (MSGLD)
Location: Labuan, Malaysia.
Website: metalstream.io
MetalStream Gold (MSGLD) tokens are gold-backed, ERC-1400 compliant security tokens backed by and redeemable for bullion. MSGLD are securities fully backed by physical gold extracted from mines in several countries to reduce risk.