Ok, so box is just geek for computer, and broadcast is just geek for send, and signing is still a mystery to me.
We do not speak the same language obviously.
How a turned of phone is less secure than a computer that you geeks run all the time is also a mystery to me.
I have no problem what so ever with having my coins on a phone, you are just way to afraid of ghosts.
two things;
You actually think a phone is ever turned off?
And no, an online computer is no more secure than a phone...that is what the offline computer is for.
I used to hold a decent portion of my bitcoins in my blockchain.info wallet that was paired to my phone. However, when BTC prices went from about $700 to $2,500 I began to become quite nervous about how much value that represented. It took me a little while to change around my security and to move a considerable amount of that value to off-line solutions (mostly hardware wallets).
The other thing that I noticed was that I had some value that was fairly insecure, and I was not really thinking about it too much because maybe it had represented less than $500 during the sub $700 BTC prices period - but then all of a sudden, those funds became real value and even caused me some worry to make sure that I secured them and then ultimately transfered a decent portion of those previous "crumbs" to largely off-line solutions.
I just want to say that this represents my frame of mind too... just a little while ago, I had money that wouldn't mind throwing around, and didn't care if I lost it all.. and I just invested without a care in the world (doing due research of course, but not stressing over it that much).
Now that I have an amount which I consider actually substantial, I worry all the time about "the next 90% crash" and stuff, and losing it all.
You seem to be bringing up another point that is different from my own, and accordingly, if you are fearful of a 90% BTC "crash," which would be BTC prices going down to about $2k, then you seem to be overly invested - because I think that each of us should make reasonable efforts to attempt prepare ourselves for a possible 90% crash - even if none of us will really like it, but if we believe in bitcoin, and we have held our bitcoin through 2017's price appreciations, we should have enough value reserves set in order that we are prepared for a 90% correction that would bring us down to about $2k, which is really only mid 2017 price levels.
I personally believe that the odds are currently against a 90% correction, at this time, because I think that BTC prices are likely to going to go up before they go down - however, since bitcoin prices have appreciated so much in the past year, and especially surprisingly in the past 4 months, those recent BTC price appreciations should have allowed any of us a much better preparations than what we had previously had - merely because the BTC price appreciations were so much beyond our expectations.
At least for me, it has been quite surprising how much money is represented by just having had taken out about 11% of the value of my holdings and having those in fiat - by the time that we were at the $19,666 top I had about 11% of my BTC value in fiat, and then after our 43% price correction, I still seem to have about 9% ready in the event that there is further BTC price crashes from here on out.
Now, I understand if, on the other hand, you did not have very much invested into bitcoin, prior to this year's price appreciation, then you might feel more attached to hanging onto whatever amount of BTC it is that you have invested into bitcoin and in those circumstances you might not have felt that you had been able to cash out enough BTC on the way that the BTC price was going up in order to provide yourself with adequate and sufficient downside price insurance.
Yeah, I don't want such a downside prices to happen, because I am much richer with prices staying higher or going up, and I am inclined to believe that a 90% price correction is not going to happen, yet, but I think that it is absolutely prudent to attempt to prepare for as much as a 90% price correction - even if the odds seem to be a bit against such a magnitude of correction.
Sure, you may be good enough to prepare for a 70% BTC price correction, but since we had so much BTC price appreciation in the past year and especially in the past 4 months, it may be beneficial to sketch out a plan that prepares you for a 90% correction, just in case.. and really you do not necessarily need to take too much of your BTC holdings (even 10% or less could be enough) in order to prepare for such a possible scenario.