I am looking for solutions for longer term digital/physical storage for my BTC,  and alt-coins of assorted types.  I have been holding onto my coins and watching them steadily increase in value,  and I plan on keeping them longer term well into the future.  Some of the richest BTC investors today are people who bought coins in 2010/2009 and just forgot all about them until 2013 or now.

They are a great investment so far,  and although I have bought and sold in the past as an early adopter of ASIC mining in 2013,  I haven't moved/mined any since 2015....  and I first owned BTC at about $60.00 a coin.

One additional issue is that I want my coins to be accessible in case something happens to me,  to allow access to them by the caretakers of what is left of my estate.  I am considering holding in a safety deposit box at a bank.

The challenge with any storage medium is leaving instructions in how to deal with them to less technically capable persons,  particularly those who don't necessarily understand bitcoin/alternate coins,  and/or the value.  Easy access is important.

For BTC I was considering a Trezor,  although I am open to other mediums.

For Dash/LiteCoin/Doge/Cloak/a bunch of other alt coins of varying value - I am open to any suggestions.

One issue that I want to ensure that doesn't happen is the MultiBit HD unconfirmed bug,  which I just got over with.  It was ass-pain,  and while a simple solution,  might be beyond the capabilities of others who might have to handle the coins.

Thank-you