... investors in COIN are going to be effectively be investing in bitcoin as they will own a trust that owns bitcoin.
Exactly. They will
have to own the corresponding amount of BTC, or the ETF will fail to track the BTC price (minus expenses). The gold bugs keep harping that "GLD doesn't own any gold" but the fact that GLD has done such an admirable job of tracking the gold price is a proof that it indeed does own the gold it claims to own.
Proof? Oh? The fact that GLD tracks gold doesn't prove it has any gold. It only proves the manipulators are paying attention and staying active.
But the comparison of COIN to GLD is interesting. If GLD can sell off the physical gold, as many believe they've done, what would keep COIN from secretly selling off some bitcoin from the fund? I don't know enough about the blockchain to know if clever deception can always be caught.
However, it should increase the liquidity and might stabilize the price (i.e., reduce the volatility) a bit.
Liquidity? Interesting. The FED's wrongful manipulation by "
injecting liquidity" by printing up fresh dollars is one of the problems bitcoin might partially solve. It seems almost dirty to talk about injecting liquidity in bitcoin.