If you dont hold it you dont own it. I have heard of metal backed crypto's which to me sound the same as ETF's but unregulated so never looked into them.
1/ I hold my silve rin a safe place only me and the wife know about
2/ The silver market is worth around $18 billion and the cryptomarket is worth $600 billion, i do not think they are related
3/ My silver stacking plan would not change, fiat has been losing value for ever 100 years
4/ I only own silver and small amount of gold. Copper is worthless, $10k in copper would need a truck to move. Silver and gold are easy to buy and resale
Good strategy... everyone should keep their precious metals in their own possession. However, if you have bulk silver and lots of it, you may want to consider storage in a vault. I have written a report on how to internationalize precious metals, it's over 100 pages long and a complete compendium on the topic. In doing so, I have spoken to many of the most reputable private vaulting facilities around the world. But a bird in the hand is worth 2 in the bush, hold the precious metals yourself if you can.