There are plenty of examples of gold "side chains". The GLD ETF derives its value from gold. Egold once derived its value from gold. In fact anyone who owns any kind of note that is redeemable for gold is participating in a gold "side chain". Perhaps the most infamous example is the USD which has also lost its peg to gold. These pegs were eventually lost because of central points of failure, but the physical gold remained unharmed. Bitcoin distributes these central points of failure and if side chains fail, the bitcoin will remain. Of course none of the elemental properties of gold were changed to create gold "side chains" and that is why we should go the federated route with bitcoin.
i don't necessarily agree with this. those ETF's and egold had to hold physical gold which "backs" those derivatives, whereas with SC's, BTC units are "transformed" into something totally different and then ride on less secure SC's. these speculative assets i think are worth less than the original BTC. if they get hacked or fail, those BTC are locked up forever, which i don't think necessarily translates into higher value for the rest of us still on MC. it could erode confidence.
Maybe you don't agree because you don't understand it?
Those ETF's, egold &
BANKS were indeed supposed to "back" those promissory notes with gold in vault. History has shown us that this dependence on counterparty leads to abuse of trust and ultimately inflation of the value invested.
SPVP Sidechains solve this problem by relegating the convertibility and "peg" to the protocol. Much like it was the case with BTC the counterparty risk is considerably reduced effectively guaranteeing that the "derivatives" are backed with BTC.
I have already presented that example but sidechains are to Bitcoin what paper currency was to gold. Unlike paper currency, the trust does not reside in one central entity but in a federation of servers OR in more desirable cases in the Bitcoin network.