Some Noob-ish questions
So, I've been doing my reading here, watching videos and trying to understand this world before I begin jumping in.
Some questions that remain a little unclear to me, so I hope you can help
Is there only one blockchain? Or is blockchain a concept? From my understanding there can be public and private blockchains e.g. UK Govt could have it's own medical blockchain, and Nationwide bank could set up it's own for banking.
Wallets - Can a hardware 'cold' wallet contain currency from more than one source, or would it only keep, say, 100k example-coins? A nano ledger wallet cannot keep some coins (e.g. sia?) as it's not set up for it?
I should not keep currency in exchanges - kraken, bitstamp
Without a wallet, I cannot use services to change bitcoin into X
How do I find/get a destination tag? Are they important?
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