are you talking about the OP_RETURN output scripts' content?

if so then you just have to parse the bytes into whatever format you want. since there is no rules for it, you have to know what that data is. it could be a text using ASCII or UTF8 encoding in which case you just have to decode it using those encoding schemes, or it could be some script or even a hash (ie. random data in your POV).
if you just want a site that shows these things then visit a block explorer like smartbit that has that option. https://www.smartbit.com.au/op-returns

that is the case with all prolonged trends, certain people get stuck in them. they always end up feeling it is the "normal" to see price rise every day each time we have a long period of bull runs near the end of the bubble cycle. that is why so many are always surprised when the bubble burst occurs and they no longer see every day rises for a long time.
it works both ways too, similarly we saw this year that everyone though going down was the "normal" and it should continue.

as for ICOs did people really buy "bitcoin" to invest in ICOs or were they buying ETH to invest in ICOs? i remember it was the later!

try combining the two methods: coinb.in with core client while using a BCD block explorer. that way you don't need to sync anything.

- open a BCD block explorer and search your address to get the list of transactions. now you have to figure out if each received tx is spent or not, explorers usually have some sort of indicator for that. if it weren't then copy its txid and the index of your address among the outputs of that transaction (eg. if the tx is paying you and your address is the first one your index is 0, if your address is the fifth one then your index is 4)*
- select inputs tab and set txid and N value. (leave script and amount empty)
- select output tab and insert your address and amount, you may need to convert your address here if BCD uses a different address encoding like a different version byte (if it does let me know to explain how to do that)
- click submit and get the raw transaction and transfer that to core client
- use the signrawtransaction command to sign it with your list of keys.

* a random example from last block:
https://www.blockchain.com/btc/tx/7f3298d222478f9ad2eae0e44dca57c32f6a5461c87555caf77e1954d05197f5
assuming 3CrHefYE5ZnMEeedXxKZbU8icQVkc93rPD is your address hypothetically, the txid is 7f3298d222478f9ad2eae0e44dca57c32f6a5461c87555caf77e1954d05197f5 and N (or index) is 7

that is what happens when you are using closed source software (that is iPhones operating system that is mostly closed source), the company (specially when it is located in US) always injects backdoors in their software intentionally and also like always backdoors will exist unintentionally and won't be caught for long times and will be exploited a lot.

it isn't the goal yet! 0.01BTC with current rate is about 80 bucks and that is not really a big goal. even back when 1 in a million was a goal and people wanted to reach 21 million the price was in the thousands (between 8 to 10 thousand dollar) with that rate the current goal would still be 1 whole bitcoin although i'd say that is lacking ambition.

you ARE asking how to do it, if you don't want people answering that question then change your title to a better one.

there currently are known services such as the one you have in mind but they all suffer from the same flaw and that is lack of trust. and  there is also a certain level of shadiness to all these online services that makes them undesirable.

its ok to post about it on this forum by the way, you can either post it here or in Service Discussion board.

altcoin era will not come until they start producing decent cryptocurrency projects. otherwise as long as they continue this way and keep creating useless coins copying bitcoin with minimal changes that have no purpose other than only to pump and dump, we continue seeing the same market situation.

as for this project you are advertising here, i don't see anything interesting in it. it has a lot of hyped up advertisement which we have seen millions of times in its predecessors. whether you want to invest in it or not depends on your willingness to gamble with your money or not.

that really isn't a good metric to look at. there are certain times where bitcoin price makes an unpredictable move like the past couple of days or the start of this year when it went below $6k and it surprises everyone so there is obviously a lot more topics being created about "the bottom" and the "sentiments", etc. but it really doesn't show anything about the actual "market sentiment" which can be anything even if the topics say something else.

it depends on your definition of the term "diversify".
normally to diversify means to invest in multiple "different" and "unrelated" assets so that you can reduce the risk you are taking while still keeping the profit up. when it comes to the cryptocurrency market, unfortunately we don't have any other option than bitcoin. the altcoins are more like penny stocks, so what you call "diversification" would be like buying Apple shares and then buying a couple of dozen penny stocks! that strategy can not be called "diversification". on top of that as @bitmover pointed out, altcoins are in a way linked to bitcoin. whenever bitcoin goes up or down they get dumped so you are not really reducing any risks, what you are doing is to give yourself a false sense of security while maximizing your loss.

actually the data on these sites is exactly the same and it is accurate. the percentage is also the same thing if calculated using the same data. if there is any small differences then it is because the lists are different meaning one list has 2345 shitcoins and the other has 2456 shitcoins so the final result may be a little different.

we have not yet reached enough adoption to have something like that specially for altcoins that so far have near zero adoption and are only used as short term trading toys by day traders. so all you can find is usually the same investing one coin in another when that other coin is getting pumped to increase the amount of first coin you have.
with bitcoin you may find some options for investment, usually it is in a bitcoin-related business that are looking for increasing their capital. be very careful what you trust though, since there are lots of scammers out there trying to abuse the irreversibly of bitcoin and rob you.

it is called "private" key for a reason, it should remain private. if you share it with others then it is no longer secure, not because they may access the funds but because they may leak it if they are not careful. i personally prefer hard copies on a piece of paper, that way you can only physically access them and you will remain in possession. then if something happened to you, your next of kin can go through your belongings and find it. you could also add instructions to what bitcoin is and how they could access the funds.

did you look at the pictures in that article with the curves and the lines? if you haven't first do that and then come back and read on. mainly this:



the point addition is basically defined as drawing a line between the two points, finding the third point (there is always a third point "intersection" when the other 2 points are on the curve) on the curve and negating that.

we call the point without a name S on this picture, and first have to find S then find R from that.
first a line between the two points and find the "formula" for that line. since the line is straight the formula is y = mx + a where m is the slope also known as λ.
λ = (y_q-y_p)/(x_q-x_p) and
y = y_p + λ(x-x_p) is that formula using point P (we can use any of the other 3 points too). if we put it in the elliptic curve formula (y² = x³ + ax + b) we get:
x³ − λ²x² + a+2λ²x_p −2λy_px + (b−(λx_p−y_p)²) = 0
we know thanks to Vieta that in a quadratic equation ax³ + bx² + cx + d =0 that the sum of roots r₁, r₂ and r₃ is equal to -b/a so in our case sum of three values for x which are the coordinates of the 3 points on the straight line is equal to -(-λ²/1)= λ²
hence we can calculate the x coordinate of point S:
x_p+x_q+x_s=λ² => x_s=λ²−x_p−x_q. and since x_s=x_r we have found the x coordinate of our point R which is here: https://en.wikipedia.org/wiki/Elliptic_curve_point_multiplication#Point_addition
to find its y coordinate of S we simply use the line's formula and since y_r=-y_s we just have to flip the sign hence the y_r formula in wikipedia link

2 additional things to note:
1. point doubling aka adding a point to itself is the same math with only one difference: x and y coordinate of P and Q are the same.
2. all the math here is modular (mod curve's prime)

when they lost a huge amount of money by trusting some shitcoin that has a high market capitalization. that is the story with a lot of ethereum bag holders today as they are currently in nearly 90% loss and had invested in it just because someone told them it is "number 2" with their CMC sorting.

what you are looking for is not in Electrum source code but in server source code. the Electrum code is just the client that is sending the request to the Electrum node/servers which will then be processed by them and they return the response. they way servers work is that they have already indexed their blockchain (which is why it needs a much bigger disk space compared to a regular node) so they can look up requests easier.
i'm not really sure what code they use but i believe most of them are running this: https://github.com/kyuupichan/electrumx

usually things like this are considered advanced and since they don't have that much demand wallets either don't implement it at all (even through their CLI) or only have it accessible through the command line interface. but if you think it is needed (like seeing a lot of timelocked txs on the blockchain every day) then open an issue in your favorite wallet and ask them to add the functionality.
otherwise you only have less popular and sometimes less safe tools like coinb.in

as long as you own your private key and remember the "locktime" you used, you can always reproduce the redeem script easily. the script is a pretty easy one too:
even if you forget the "expiry time", if you knew the ball park you could easily brute force it in a short time.

ps. you can also always avoid using P2SH but coinb.in doesn't have that option.

giveaway is when you don't do anything but receive something for free as some sort of "gift". when you have to pay, then it is no longer a giveaway, it is more like an investment and in this case since there is no company or product or anything it is a Ponzi scheme. you didn't really have to check the domain, etc to figure it out either, it is just that obvious.

there is no conspiracy in action, it is just momentum. the price broke the very strong buy support at $9k+ and has been going down because of that thanks to a lot of stop loss orders, panic sellers with weak hands, lots of shorts and like always some manipulation.

well when you bend the definition of certain terms such as "dominance" then you can assign any values you like to them. for example nowadays the definition of "dominance" is distorted and it currently refers to "market cap ratio" so yeah, obviously the so called "dominance" of bitcoin is not 90%. not to mention that market capitalization is a fake value on its own that was imported from stocks market into bitcoin market and it doesn't make much sense specially with how most altcoins have major premines or are being created out of thin air whereas outstanding shares (of a company) do not.

but if you use the real value of the term "dominance" then you realize that bitcoin is dominating the market not by 90% but by nearly 100%. that is why it has the highest volume, why everything is being measured and traded with bitcoin, that is why whenever bitcoin rises or falls everything else gets dumped....

that was one of the interesting parts about your project actually. it makes recording the flip results and eventual conversion to an integer (or hex) which you could then store or use as your private key, a lot easier than using bash or generally a command line option.

coin flip or generally any source of entropy that doesn't depend on computers can be very secure but it is sometimes extremely hard and they require a lot of attention. you should always make sure there is no bias in the results. for example the coin should be symmetrical and your flips should always have a 50-50 chance of heads or tails. and you have to repeat this 256 times and each time do it in the same exact way, that is not easy!