Try to acceleratate it using ViaBTC. Try all the time until it is successful acceleratated. It will definitely work.

Alternative
You can try to increase the feerate if the transaction support replace-by-fee. Do not use CPFP because it will only result into you paying for two transactions.

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If you are using legacy addresses (addresses that starts from 1), do not use it again. Use segwit addresses (the addresses that start from bc1), you can safe up to 42% fee or higher by using segwit addresses. To find a wallet that support segwit, use electrum. You can get it from electrum.org, make sure you verify its signature.

You need to provide more details. What is the feerate (sat/vbyte) used? Maybe you can use ViaBTC free acceleratator. If you are confused, can you paste us your transaction hash (txid)? Although, It can affect your privacy as we will know about the transaction and previous transactions into and out of the address.

I too have not used the wallet before, I downloaded it just to know how the wallet was at the time, and I deleted it without using it. According to the claim by the article I have found out about the wallet which I am not sure if it is true:


So, I do not think they store private key or anything related on database, that is why the seed phrase or the wallet file is important/needed during recovery.

That quote is a damn lie from blockchain.com

Blockchain.com wallet is a noncustododial web wallet, but a wallet that require email is not a recommendable wallet, one of the reasons such wallet should not be used, and the other reason is what you commented about above, about it not supporting segwit. The mempool is so congested right now, but it is as a result of miners that are recently not mining in China due to blackout (the cause of the blackout, I am not certain of), if they still not yet continue to mine, the mining difficulty will still be adjusted, and the feerate will be reduced in approximately 2 weeks time, which is usually done at every 2016 block.

There is no specific blockchain for Africa nor specific miners for Africa, there is only one blockchain and miners are all over the world mining and confirming transactions which is general and not specific to a particular country or continent. The mempool right now can include transactions with feerate over 200 sat/vbytes, this is unusual. This will soon be over approximately begining of next month when mining difficulty is adjusted, their would be reduction in feerate.

But, try to make use of segwit next time, you can use electrum wallet for that rather than using wallet that do not support segwit. Blockchain.com wallet supports only legacy, this will be responsible for more teasnation fee paid, if it is native segwit you want to use, 42% or more fee would be safed as segwit fee is lower by 42% or more.

Also, know that bitcoin transaction fee is not calculated using the amount you want to send, it is calculated based on weight. If you are sending $10 worth of bitcoin with 1 input and 2 outputs, and the fee is 0.00002 BTC, the same amount of fee will cost you if even sending $1000000 worth of bitcoin having 1 input and 2 outputs.
 

According to what I researched just now, ChnageNow is a decentralized exchanges, I do not know how decentralized actually is it, but it will definitely charged transaction fees paid to miners for every buying and selling, in addition to the normal fee charges. I guess the fee paid to miners for transaction confirmation is responsible for this. Is there no option to edit the fee? This will be the best option, also trying to make use of weekends to buy and sell if you can edit the fee (especially Sundays) because the fee are usually less during weekends, but not all weekends. Or, you can try to make use of direct p2p exchange performs (but be mindful of scammers), you will need to make use of a trusted escrow provider. Or, try to make use of noncustodial custododial exchanges like Coinbase or Kraken.

Waiting I mean be sey the resistance for a price above $60000 dey too much, and big institutions no dey try at that level. You know sey institutions tried as bitcoin price dey increase, especially the ones that cause fomo buying. Grayscale and microstrategy try push the price upto $40000, while Tesla push the price to over $58000. Although, no be sey na wating they invested push the price, na because sey the amount huge and cause people to fomo and bought more bitcoin at the time, which made the price to over $58000. News sey miners dey hold and whales no dey sell again push the price from $45000 when the price falled, it increased to $62000, the price drop again, the same news of whales and miners dey hold cause the last bull market again before the last crash. And the price not get upto to $70000 yet having resistance at $60000. Na why I say e go hard for the price to reach $70000, but over long time, as we know how bitcoin dey deflationary and people will buy more, will make the price increase above $70000 certainly, but I dey guess not now.

How many times do we need this to be repeated. The sudden huge fee paid lately is as a result of reduced mining hashrates, and if it continues like this, the next 2016 blocks is not even upto 2 weeks again, and the mining difficulty will be adjusted, in which fee will become back to normal.

You are right, but just to make it more clearer, it is not 2 weeks exactly, although it is usually roughly 2 weeks, but the exact time is based on block height which is every 2016 blocks that the mining difficulty will be adjusted, which is roughly every 2 weeks.

I think it is self explanatory, that you should increase the fee, the mempool is filled already with transactions that have higher fee, for the purpose of your transaction not to be removed from mempool, is the reason for the notification, you will need to increase the fee. The feerate is around 210 sat/vbyte for now, even having slightly higher fee like 20 sat/vbyte can not get your transaction confirmed for now.

There are three options for you:

The first
Use CPFP if you are the receiver, and that the receiver wallet can spend unconfirmed transaction (like electrum). All you need to do is to send the unconfirmed bitcoin to another address on the same wallet, but with a very high fee. Using around 270 sat/vbyte will be good for the child transaction. But, because of the high fee, I will not suggested this for now.

Second one
You can make use of paid Accelerator like ViaBTC, but also not still recommended because of very huge fee that will be paid.

Third
I will recommend you to make use of this third option. Make use of free acceleratator, most free acceleratators are fake, but ViaBTC still do work perfectly. I have tried to accelerate it for you, but not working, it do take 100 transactions per hour, try to make use of it like 5 minutes to the start of an hour to like 10 minutes after, likely it will work around such time.

It is not possible to guess the private key from the generated public key, private key is made up of characters that are long and not guessable.

But, if you mean 'is it possible to calculate the private key from public key' because public is generated from the private key. Still not possible because it is an asymmetric calculation in which what is generated from multiplying private key with a constant point called generated point to give public key is using one way function elliptic curve multiplication, dividing the public key with the constant point can not result to private key generation, it is not possible as it is one way-function.

Also, if you mean if the private key can be brute-forced from the public key, it is also not possible with the modern days computer. The private key space size is a very large number (2^256) which is approximately 10^77, while the visible universe is estimated to contain 10^80 atoms, so brute-forcing a private key just still remain impossible.

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It is better you use bitaddress.org to generate the paper wallet as suggested by Quickseller or using using wallets like electrum offline to generate it as pooya87 implied. During generating it from recommended means, also still make sure you generate it safely in an offline environment.

You dey correct, fear dey make traders make mistakes, but no be only fear, emotion generally dey there. If some trader dey see the market dey fall, and come dey rise back, they go still dey fear the market no go still dey fall further, and the best time to enter market na such time. But, this dey specific to trading.

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For me, I dey predict bitcoin market price no go fall below $50000, and if the price fall below $50000, e no go fall below $45000 for now, $50000 na strong support, the good reason Microstrategy put money for bitcoin at the price. As for getting beyond $70000, e go hard for now as all those big institutions still dey look for now, but sure that the price over long time period go go beyond $70000, that one dey certain.

I do not know which address format you asked them to submit, but it would have been better to asked them for native segwit address (bc1) in which you will reduced up to 50% of the fee or more if compared to legacy addresses.  (For 1 input and 2 output, the fee reduction is 42% but there are more fee reduction as the input increase if compared with legacy).

I checked Chipmixer recently payment, the transaction fee used was 164 sat/byte. Also I check Duelbit payment which was also yesterday, the fee was 164 sat/byte.

The mempool is currently at 199 sat/vbyte, but it I think using 164 sat/byte will be good for now compared to 255.4 sat/byte that you stated above, although the fee is still high but better.

The true bitcoin we have for now only have one blockchain, which is bitcoin blockchain, it has only three address prefixes for now which are (1, 3 and bc1). Binance Smart Chain known as BSC or BEP20 is a chain in which bitcoin is introduced into such chain (but not actually the real bitcoin chain) and make use of very low fee, but not bitcoin actually, such address starts from 0x which makes it combatible with ethereum blockchain, the fee are low, and I am pretty sure Trust wallet support BSC coins, but as we know almost all altcoin wallets are close source.

The Pros
Fees are extremely low as very low is still an understatement

The Cons
Not actually real bitcoin, although it assumes the price of bitcoin
People make mistakes that can lead to coin loss, especially by sending to addresses on exchanges that do not support BSC, but the mistake come from it having ethereum addresses.

Supported wallets
https://docs.binance.org/wallets/bsc-wallets.html

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You know the blackout in certain mining region if China that resulted to miners not mining in the area by now, this caused significant mining hash reduction, the reason for such congested mempool. If this continues, the mining difficulty adjustment is less than two weeks, it will be adjusted and things will become back to normal. I see that you are getting more into managing campaign now, after the whole issue is solved, you will still be able to send using a feerate between 10-20 sat/vbyte which is still fear enough. You can still hold on to using the normal bitcoin transaction.

Positive
If you have done some transactions, businesses or the likes with the person, and you believe the person is not here to scam but can be trusted, you can trust the person, you can include a link of any reason you trust him/her.

Neutral
If you think it is not yet worth giving the person positive trust yet, you can have him neutral. If you think the user is promoting what is not that meaningful to the forum, that users are possibly at risk of losing funds, you can first have account a neutral tag.

Negative
If the person is a scammer, then his/her account is worth to be given negative trust. If promoting scam sites, then negative trust. If he/she is  planing to scam and it is obvious, you can include the link and have him/her negative trust. Any other reason a person can harm other members of this forum should result to negative trust.

Taproot will likely be activated in bitcoin core before this year ends, then electrum developer will begin to work towards having electrum to support it which will be included in any update that will be released. The privacy is in indistinguishable transactions which will solely be handled by the schnorr signature in which people will be unable to know if a transaction is actually multisig or not. You will need to create new wallet on electrum once electrum support it, and go for taproot, taproot addresses will be generated.

I think if he transfer altcoin to Gemini, convert the altcoin to bitcoin, won't he later send to noncustododial wallet as he implied having coins on exchanges is not advisable?

I am not using Gemini, but according to what I researched just not long ago, bitcoin withdrawal fee with the bitcoin current price is 0.001 btc ($56.89) on the exchange, while it is just less than 0.0005 btc ($24) on Binance. Correct me if wrong.

Why that might (my comment) not be recommended is that Changelly is centralized. But,  he can still try to take the fee down. Like I implied, not now because the reduced mining hashes in China caused mempool to be congested recently, where bitcoin transaction fee is very high unusual. The mining difficulty is adjusted every two weeks and may remain the solution in which things will become back to normal.

On Sundays (but not all Sundays), if the mining difficulty as been adjusted, possibly the mempool might get back to normal in a way 10-20 sat/vbyte transactions might be included in a block fast on Sundays. This is the time to make use of what I explained above. On Changelly (when I used it on Coinomi one time ago), there are four fee estimates (high, normal, low, and custom). You can customize the fee when the mempool is less congested on Sundays. The fee I used one time ago to exchange was 10 sat/vbyte, it confirmed on Sunday.

You do not need to send anything from Binance to Gemini, so far you want to withdraw to your noncustododial wallet to have the full control of your wallet and to hold, there are ways to still avoid such high fee. I will recommend Monero withdrawal on Binance because the fee is very low which will be around $0.039 at the current $390 Monero price. Convert the bitcoin to monero, send at $0.039 as fee to a noncustodial wallet like Coinomi that support third-party exchanges, exchange it back to bitcoin which will require only the fee paid to miners, you can even customize (edit) the fee. Then send from the bitcoin from Coinomi to the wallet of your choice using low fee amount.

This may not be the best time for this, try to wait 2 weeks after the mining difficulty is adjusted, and do the whole process on Sunday if the mempool is very much not congested. All that will cost you may not take up to $6. I would have even recommended you to leave it on Coinomi, but Coinomi is a close source wallet, better moving it to a hardware wallet like Trezor is better for safety. Online wallets are not safe comparing to offline wallets, but the most recommended online wallet is electrum.

You question is not clear. You want to create a new wallet, also you want to input the seed phrase from the other wallet. If you want to create a 2fa wallet on electrum, you will need to generate the new seed phrase from the electrum, not importing any other seed phrase.

• open electrum
• Press 'Next'
• Click on wallet with two-factor authentication
• Read the important information and click on 'Next'
• press on 'create a new seed' or if you already had an electrum 2fa wallet before and you want to restore it, then click on 'I already have a seed'
• backup the seed phrase generated
• input a password
• 2fa code will be generated, scan it into authenticator, or use the key by inputing it on the authenticator
• the authenticator will generate code
• input the code on the electrum
• then you have crated 2fa wallet

But, important information:

             Batch size                     Per transaction price             Batch price
Pay every 20 transactions:           0.000025 BTC/tx           0.0005 BTC total
Pay every 100 transactions:        0.0000125 BTC/tx.        0.00125 BTC total

Which means for every 20 transactions, you will be charged 0.0005 BTC total, or you can make it 100 transactions which you will be charged 0.00125 BTC in total for every 100 transactions. The reason you should consider this before opening 2fa wallet on electrum.