That is in all probability a query for an extended dialogue, much less for an q&a discussion board 🙂 There are too many opinions on , primarily based on the specified outcomes and values (and paranoia). The upper the values, the extra essential is a correct stress examined storage system. My present resolution can be a mixture of digital machines and completely different {hardware}.
I consider storing a number of altcoins in a number of chilly wallets (offline). My main concern can be knowledge loss because of damaged {hardware}. Therefor I might have two or higher three backups. I might create a number of offline PCs in digital machines/environments, and now have an offline Linux, and perhaps an older MacOSX and/or some RaspberryPIs (all offline). All programs have one benefit over the opposite. Within the digital machines I might attempt to setup a pockets, by compiling myself. If not, I take a default pockets. As soon as the process is “clear”, I can do the identical on an offline PC. It is astounding, what number of dependencies there are…
I might set up the default wallets on the offline machines, notice down the priv keys and/or seeds, seize a photograph of the priv key/seeds (ensure your cellular would not sync the picture to the community, and delete it after downloading!), and preserve it written down and/or someplace in a veracrypt container on the completely different offline PCs. It’s good to distribute, hardly all break on the identical time. Additionally I notice down the general public keys and/or addresses. Then within the exchanges, one might ship keys to “my” addresses.
I would not obtain all of the blockchain(s), that’s not required. For instance in Bitcoin, it’s ample to have the priv key, to get it loaded in an SPV pockets like Electrum. In Ethereum there’s MyEtherWallet. Different cryptos solely have the “full shopper”, which make it a bit tougher, in relation to spending. The purchasers may not acknowledge the funds, which have been despatched from an change to the chilly storage since its inception. So long as there is no such thing as a SPV kind pockets, you would need to obtain the chain as much as the purpose, the place you acquired final funds, or assemble a tx your self, and ship it to the community. I’ve carried out this a number of occasions with bitcoin, however by no means for altcoins…
You requested for an environment friendly course of, my guess is, there is not. I go away it to the viewers, to persuade me of the other 🙂 There are too many dependencies and completely different necessities, even if in case you have the technical understanding, implementing a pockets and having the ability to chilly storage nonetheless requires an excellent pondering on course of and making an attempt it out regularely. I might be very aggravated, if I believe I’ve saved my knowledge, simply to find at some point, issues have modified and I can not entry funds!
Right here within the discussion board are many hyperlinks to the key phrase “chilly storage”, and over at bitcointalk as properly. So my put up is by no means protecting all and each choices. Perhaps folks can share some extra choices.