you still can't compute the master key (private or public) by only having the child keys (private or public) because the process is simply irreversible since it uses SHA512 hashes inside the HMAC.

unless you are a day trader you have made a huge mistake.
and as a day trader talking about one sell among dozens doesn't make any sense to be honest with you. and i am wondering since you are talking about your sell at the peak why aren't you also talking about your buy at the dip? unless you made another mistake and forgot to buy and now price is back up again?

FUD like this and even worse than this have always been around. whether this was the FUD itself or unrelated but used as FUD doesn't matter. in the end they keep spreading negative information about bitcoin which is why the adoption has been this little and price is still this low instead of being hundreds of thousands already.
but the good news is that in the long run, the effects of FUD shrinks as people see more bitcoin usage in real life and that is clearing a lot of things up for them.

bitcoin has always been a safe haven even before it reached $12k and long before that in its early days back in 2009. it is a safe haven asset because it is decentralized, unique and 100% secure. nobody can take it from you short of torturing you to get it out. gold and other assets can easily be confiscated or even stolen.

the only problem with bitcoin, which still exists, is that it is new and volatile. so it brings a certain level of risk with itself which is why it is not yet widely accepted by people around the world.

during price rises like this, i wouldn't call any price a "resistance" because they evaporate very easily. we just saw today how now just $11700 but also $12000 marks were surpassed very easily and even though there was a day trader + bot panic sell the price is still close to $12k.
it is the momentum that breaks all these no matter what resistances seem to exist on the charts.

let me try to explain it a little.
each time you receive a payment in a transaction you receive a transaction output that can be called a "coin". when you spend bitcoin, you are spending one or more of these coins by putting them in your new transaction and setting a new destination.
but like in real world when you want to pay $9.99 and have a $10 bill you are left with some change. that change is also a new transaction output (aka coin) in bitcoin.

lets say you have received 2 payments so far. so you have 2 coins and lets say they are worth 1500 and 2000. if you pay someone else by only using the first coin and pay 1000 + 250 fee you will end up with 250 satoshi change which goes into a new output and since that is too small, majority of nodes reject it as "dust". it would be a little like paying $9.999 and wanting to receive $0.001.

so your choice is either pay a slightly higher fee (not receive your change) or put more coins in to increase that change amount to be bigger than dust. in the example above you can add the other coin and basically enter 3500 and pay 1000 + 270(fee) + 2230(change).
fee goes up a little but you get your dust out and consolidate your outputs.

assuming the change is the dust that raised the issue, you either have to
- add that small amount to your payment to whatever address you are sending to
- or increase your fee by that dust amount so that you don't end up with any change
- or you have to add other coins to your transaction to make the change bigger which may not be so good for your privacy (linking different coins together).

you can select coins (transaction outputs) from your Coins tab which can be enabled under View menu.

all i have seen from this index was people analyzing the past. you can clearly see it in OP too. i have yet to see someone use this to predict the direction that market can go in future or even near future.
it also seems to me to be a very new analysis with very little merit.

when people talk about these crypto scams, one thing they usually forget is that they didn't really start with cryptocurrencies. these scams existed for many years even before internet and now they are changing their form.
because of that, there isn't much anybody can do about it. if you look around this forum alone you will see dozens of topics warning others about the scams and educating them about how they can verify them. this forum is also top rank in search engines. and yet people get scammed.

that is not pushing the value up though. it is only pushing the price up and that doesn't mean much.

value of bitcoin has to rise which means if you can for example buy a cup of coffee with 43000 satoshis today you have to be able to buy the same cup of coffee with 31000 satoshi (or anything less than X).
but when they print money, the value of fiat is decreasing and a cup of coffee that was worth $5 for example would be worth $7 then and you still pay the same 43000 satoshis even if bitcoin is worth more against $$$.

unfortunately when you look at the value of your bag of altcoins in terms of bitcoin most of the times you will see that the total value of it has decreased dramatically because they always dump against bitcoin. and the more altcoins you bag hold the bigger that drop is going to be.
but when you look at it in USD then it looks like it has grown, but why hold altcoins if you want USD profit in first place when the biggest rise is done by bitcoin?

yes.

these developers are making money when people use their product which isn't a bad thing but i still don't like the idea of it, i prefer peer to peer trades if i am to use a "decentralize" exchange.

in a list i saw there was a couple  of them that didn't look decentralized at all because they were using a server that could also log everything. there is also binance DEX that exists in most list and is fully centralized with all the sign up requirements and the restrictions it has!

if i wanted to use CEX i wouldn't have started this topic!

a real decentralized, peer to peer exchange has no cost for them to go bankrupt. it is fully peer to peer, it means you are using your own computer to connect to another person's computer and make a swap.
it is like saying "bitcoin core devs have to take a fee from each transaction we send using bitcoin core or they will go bankrupt"

it is because bitcoin private keys are not strings. they are integers that are encoded using a special encoding called base58 (since it uses 58 characters). and this special encoding has a checksum at the end which means when you change a random character there is a high chance that the whole thing becomes invalid.

i have been searching for a bitcoin exchange that is decentralized but i i have three problems:

1. some of what i find are not actually decentralized!

2. 90% of these decentralized exchanges are actually token swaps. but i have no interest in tokens, i am looking for an actual exchange where i can trade cryptocurrencies. i am not interested in tokens

3. finally it is the fees. it makes no sense to me to pay fees to a centralized authority while using a decentralized exchange! and sometimes their fees are also too high...

can you introduce me to an actual decentralized cryptocurrency exchange that has no trading fees (everything happening P2P)?

custodial accounts are the worst thing that has ever happened to bitcoin and will always be that way. they are not at all needed for growth, in fact if anything they could be keeping bitcoin back with all their shenanigans. each time we see a price rise their servers magically crash, each time things are good one big (but shitty) exchange gets hacked and loses millions of dollars worth of bitcoin and later we find out they didn't even know what the word "security" means!
not to mention that they are centralized and practically act like a bank (they control your money and can decide not to let you use it) which is against what bitcoin stands for.

do we actually know the location of miners (the farms they have) and the total hashrate of those that could be affected by such a flood assuming it happened?

to be honest this seems more like another "China controls bitcoin and if you sneeze there it affects bitcoin" type of topic to me.

the problem with a disaster of this magnitude and severity is that it wipes the person alongside their paper wallets! so there would not be anybody left to claim the coins from that paper wallet anyways assuming it is following the security recommendations and encrypting the paper wallet. otherwise without encryption the risk of having such a secondary backup in another location is higher in my opinion than not having it at all.

i'd say that $100k is a good estimate for the minimum value for the next ATH in the current ongoing bull run that will probably end in mid 2021. but it is still the minimum not the best price that could be reached. if the past is any indication we should see at least $200k and if the exact repetition of previous couple of cycles happens then price should reach somewhere between $400k and $500k.

you can always mine in regtest mode. the difficulty is too low that you can mine thousands of blocks within seconds and it won't go up either.
but for now here is a test case that has OP_CHECKSIG inside scriptsig:
https://github.com/bitcoin/bitcoin/blob/b53af72b8276e8a23915d38fe459889cccb56f50/src/test/data/tx_valid.json#L169

the data part could be anything but you still need at least 2 items (since OP codes like NIP and SWAP need 2 items) and they could be anything even un-equal values since it seems like your redeemscript is dropping the comparison result from the stack anyways so it won't matter.
also the redeem script itself must be there too.

by the way 030151 is an invalid script because it has 2 bytes instead of 3 (0x03 + 0x0151)