Take note that the extension doesn't necessarily have to be a word from BIP39 wordlist.
It can be any word, phrase or even symbols, the "Seed Phrase Extension" is actually a passphrase a.k.a. "BIP39 Passphrase".

Check the 'History' tab if it was saved as a local transaction (with blue computer icon and "local" txt),
if not, follow ranochigo's reply.
if there is, remove the local transaction first to be able to use the inputs that it used, those are basically 'locked' by the wallet until you remove it.

I have a Bluewallet wallet and my recovery phrase also consists of 24 words, but that's from a version from about 1 or <2 years ago.
Newly created wallets by the updated version only contains 12 words.

If it's the derivation path, you'll be able to restore the wallet but the restored addresses will be different.

To which wallet?
Because Bluewallet wont show a "Checksum Failed" when you paste a seed phrase with invalid checksum.
It will just fail to import the wallet with a different error.

If it's in Electrum with BIP39 seed option ticked, and if the next button isn't clickable while it's not ticked, then you may be correct that it's not in the correct order.

You can contact a pool operator with good trust rating from this board: Bitcoin > Mining > Pools
Ask them if they are willing to include your transaction to the next block that they will mine.

You can also try paid accelerator services like ViaBTC (not the free button) and check how much they'll charge you.
But I guess that it'll be an absurd price because of the transaction's size.

Take note that the statement yesterday about the fee was based on yesterday's mempool size, it's a bit lower today.

You got a blank output instead of the generated block so it must have failed because of "something".
I guess your processor now can't mine a block after 1000000 (default) iterations because of the new difficulty since there are already 5759 blocks in your blockchain.
You can try to increase the iterations to 100000000 to extend the time before mining fail;
for generate command (I see, it's forked from an old version of bitcoin core): shitcoin-cli generate 1 100000000for generatetoaddress command: shitcoin-cli generatetoaddress 1 "address" 100000000

Oh, if it's a WIF private key and a with a compressed pubkey flag, then you're likely getting the date wrong.

Read this thread and see if your private key is similar to any of the formats: [overview] Recover Bitcoin from any old storage format.
It also contains the necessary info on how to restore them.

That's because Electrum doesn't support P2PK (Pay to Public Key) outputs and if it's from 2009, then it's definitely P2PK.
It doesn't have an address, instead the public key itself.

Bitcoin core will work, you can import your private key using the command: importprivkey
and the funds will be added to your wallet after the rescan.

It looks like it's from an "Exchange" or a "custodial service" because the inputs' addresses belong to a wallet with huge number of addresses: walletexplorer [00008a0348]: 3EGmX5nsX2NXENgPcsN41AZrSVWjLZyjVV
And another problem: the 0.08000000 BTC value output also looks like from another custodial service: walletexplorer [00000240db]: 38RoP5wieQNjmijqW7YZUfxz3tFoJuzEzj
Thus there's nothing you can do unless you're the owner of either service.

And lastly, only a solo miner / pool operator can get your transaction confirmed but a $100 payment is currently lower than what they can get by normally including transactions at the tip of their mempool: txns with same size but with higher fee rates.

Are you perhaps talking about outbound transactions that's suddenly created after the wallet receives a transaction?

• Why? That's doable because spending "unconfirmed outputs" doesn't break any network protocol or standard rule, that's why it doesn't need to wait for confirmation to spend the just-received-transaction's funds.
• How? Some users build tools that can monitor address(es) and create a transaction upon receiving a transaction. To do that manually, the wallet/client needs to have a "spend unconfirmed outputs" option or similar feature, like Electrum.

That usually happens when the miner draws more power than the cables can handle.
Yes, pictures are necessary to know if it's safe to use, specially the power supply that you were using.
Since you're a newbie, you can only post the images as links, but use [img][/img] tag instead of [url][/url]

I'll ask a Mod to move this to Bitcoin > Mining > Mining support to get support from the right people.

Are you using Electrum's ZBar scanner (Tools->Load transaction->From QR code) or a third-party QR code scanner?
Because AFAIK, the latter will produce problems with the scanned transaction.

If it's not corrupted, it should work even if it's from versions below 2.0 (with some exceptions like very old versions 0.34 & below)

The error usually occurs when the wallet or some parts are corrupted.
Try to reassemble it in this format (create an 'electrum.dat' file and edit it using a text editor):
If it's encrypted (seed is longer base64 string), use this format:

Sorry but I have to turn down your paid private assistance request, I'd rather continue the discussion in public.
Having said that, please be careful on PMs claiming to be me or someone else since you've already shared your contacts, those are usually scam attempts.

Based from the current set of info, I don't have anything to add to my previous reply.

That is the Bitcoin's original client, it acts as a full node and a wallet. No, there's no incentive in a form of coin rewards.

If you want mining rewards, these are the examples of the "expensive hardware" kevin mentioned:
https://whattomine.com/coins/1-btc-sha-256 - Below the page (under "Mining Hardware").
Their prices are in the manufacturer's page, average power consumption is in that page.

So it's an imported watch-only SA account, means that you've imported an 'address' instead of a 'private key' to include that address in your wallet.
The bad news is there's absolutely no way to spend from that wallet without the address' "private key".
Bitcoin doesn't have a central authority/server to retrieve users' lost keys or balances, it's up to the user unless the fund is in a centralized service like an Exchange,
Mycelium's SA Bitcoin wallet isn't centralized.

The question is, where did you get that address from?
Because depending on where, you might have a chance to recover the funds.

Funny thing is: You claimed that it's "a couple of years ago", but you've used the default name which is the date when the address was imported  
What gives?

When I think about it, you don't need to test it  
The logic is: when you're seeing "All", it's showing all addresses from "Receiving" and "Change" combined; it won't switch to All addresses but it's the current list.
Get it?

Since they already told you how to copy the address from the invoice, you may as well test it.
Just do not use "Search" it's kinda bugged and may not find the copied address from neither of the lists.

Miners aren't prioritizing transaction based from the total fee, they'll base it from the fee rate.

First, take note of the transaction's "virtual size" and "Transaction fees" from here:

• 662f7e90b1e3d6f55c06388c07b62e15c6ab672c936372b64e8748c22d3923fb
• f3cb81d3a01f03b4e3b473fd3d264d0661d31f9081ca8ec6c544fee08b4ef853

The first transaction's size is higher than the second transaction so even though their total fee is almost identical, the fee rate will be lower for the transaction with higher size.
If you're not familiar, 'fee rate' is equal to the 'total fee' divided by 'virtual size'.

In contrary to what HCP said, if it said "Change", it means that you're seeing change addresses.
If you click it once, it will change to "Receiving" and the list will switch to receiving addresses.
Third time will switch it to "All" addresses.

You can check it yourself, see if the address you got from option1 belongs to the displayed list of addresses while it's displaying: "Receiving" "All" "Search"; if it is, those are "receiving addresses".

In addition, as a response to OP, you can use the second filter button "All/Unused/Used/Funded" and switch it to "Unused" so the list will only display unused addresses for you not to accidentally reuse addresses.
But option1 is still recommended.

I'm sure it's the vice versa, OP's wallet may be old or the address was imported because it's the new wallets that need BIP39 tool to export individual keys.
New wallets, those created today up to (2017?) update doesn't have that "PrivKey" option.
Only the 'imported addresses' and addresses from legacy blockchain.info wallets are the ones with the option to export PrivKey .

Looks like it's a lucky guess of seoincorporation since the only clue of the wallet being old in the OP is: he's trying to claim BTG which is a quite old fork, there's no clue in case of "imported address scenario".

Every slider appears at my end, I'm also using v4.1.2:


Perhaps you're talking about the fee slider options?
You can click the target's value ("X MB from tip", "Within X blocks" or the static fee rate) to switch from 'mempool', 'ETA' and 'Static'.