"Coinbase Wallet" app is not the same as "Coinbase" so having the log-in credentials wont help on recovering the former.
However, since you're using Coinbase, then you can just log-in to the site/app since you have your log-in info.

Or do you mean "Coinbase Wallet"? If that's the case: It's a non-custodial wallet;
being non-custodial, Coinbase doesn't have access to your backups and you really need the seed phrase (backup phrase) to restore it.

Ah, so it's a totally different kind of transaction.
I don't get how is that a "blockchain evidence" since you already know that the transaction is from Houbi exchange and Exchanges always consolidate their users' deposits.

TheQuin is on point, most consolidation transactions by Exhanges (even the ones that I use) have almost identical input values.

You mean something like this? (coinbase transaction with lots of outputs): 0000000000000000046fafea54ec57f8b1d030e74d0d15545e0534fbd6e02f4d

That was a mining pool that had been directly sending the block rewards to its miners.
This old pool is one of the example (that transaction is one of theirs): btc.com/stats/pool/Eligius
check the older block heights because most of the newer ones have "normal" coinbase transaction.

This is fully answered but I would like to add an example why this wont happen.

That signed transaction file contains the same data stored in your blockchain mempool and can even be queried using a blockexplorer using an address, TXID, etc.
So if it's possible to extract the private key from the signature, most transactions in the blockchain mempool should've been stolen by now.

Here's a tip: In Electrum, if you see any "(?)" or "Info", click it to know about that feature's function.

Given that, here's the help tooltip of the "Expires after" drop-down menu (not available in older versions):


Pretty much everything that's mentioned in this thread.

That's (from?) an outdated tutorial. The 'debug window' menu under 'help' has been unavailable since October 2018: https://github.com/bitcoin/bitcoin/pull/14573
In the later versions, the (debug) node window can be launched in "Window->Console"  

I recently had an issue with connecting to servers with domain names, can only use the servers that are IP addresses, maybe you're experiencing the same?
I think it had something to do with DNS cache and solved itself after a few days.

To check if it's the same issue:
Look for the "status" in the Network settings; to open it quickly: click the (red) connection circle icon.
If it has at least 1 connected node (but not to the selected server) you can temporarily use any of those "connected nodes" (IP addresses) as server.
To select, right click on it and select "Use as server".

For the GUI, these are the settings that you'll need (under "Settings->Options..._>Window"):


If you want to start bitcoind:

• Go to the location where the "daemon" folder is, already pointed in the other replies.
• Now, in that folder, Hold 'SHIFT' and 'right click' on an empty space inside windows explorer (while nothing is highlighted/selected),
  a right-click options will be displayed, select "Open command window here" and cmd will open that's already started with that directory.
• Lastly, type: bitcoind and it will start.

In newer Windows10 versions, "cmd" has been replaced by "PowerShell" in the right click menu of Windows explorer or start menu.
If you'll use that instead of cmd, type ./bitcoind instead.

If you want a shortcut, you can create a ".bat" file that you can double-click to start bitcoind:

• Create a new text file in the daemon folder: "Right-click->New->Text document"
• Edit it and type bitcoind, save and exit.
• Rename the "New Text Document.txt" into "any_name_you_want.bat", the important part is the extension.
• You can create shortcuts for you to link to start of desktop:
  "Right-click on the .bat file->Create shortcut" or "Right-click on the .bat file->send to->Desktop (create shortcut)"

Then you can use that to start bitcoind without manually launching command prompt.

If you can remember if it was detected by your PC (can be seen in the BIOS/UEFI), then the chance that the PCB at fault is low.
But I wouldn't suggest to reconnect a mechanically damaged drive to a computer as it may introduce more damage.
If it's the internal mechanism, then you'll definitely need a professional to do the job since it needs an enclosed contaminant-free space and specialized tools to repair.
Take note, do not seek the typical "tech repair guy" but someone specializes in hard disk drives.

It's your decision, you must consider the fact that you're not certain that you've set the miner correctly or successfully mined a block.

Correct me if I am wrong but wasn't wallet.dat encryption introduced in late 2011 Bitcoin version 0.4.0?
If so, the chance that it's unencrypted is high and would increase his confidence on proceeding to recover the data.

Setting wrong the slider into 2 of 3 could happen in most cases but during the steps of pasting the cosigners,
I doubt that they wont notice that it'll only require two additional cosigners while making a "M of 4" MultiSig wallet.

Moreover, the chance that all four cosigners happen to wrongly set the sliders into 2 of 3 is way too slim,
if it's only one cosigner, then the addresses he'll get will be different from the rest of the cosigners.

I'd say that the wallet wasn't created by accident.

Congratulations,
you might want to contact the service where you've given the other wallet.dat because he might still be working on its password.

There's a "lock topic" button below (lower-left) if you think this thread's issue is solved.

That totally depends on the wallet,
if it's a "custodial wallet" or "custodial service", then it's their customer support or recovery page if they have one.
Example of those are: Exchanges, some mobile wallets and most online wallets.

If it's a "non-custodial wallet", it's up to your own effort to recover your password.
Options mainly involves bruteforcing of the password or using other forms of backup like "seed phrase" to re-create the wallet.
Example of those wallets are: Hardware wallets, Bitcoin Core, Electrum, Mycelium, some online wallets like Blockchain.com.

Mostly in yoga class or during recreational activity  

I think the "eye symbol" is an indicator that the transaction is for the wallet's watch-only addresses, thus not the actual fix.
The pull request name didn't indicated the fix but one of its commits does: /commits/d476f41d5f16e3f9f6f59f358cb5649657081384

Ah, so that's why you've resync.
What I'm thinking is it might be not necessary depending on the cause of the issue.

But since resync is already initialized, there's nothing you can do but to finish it, and hopefully that might fix the issue.

If it's not in his mempool nor blockchain, but he's using the GUI (bitcoin-qt)
he can use right-click menu of the transaction in the 'transactions' tab and select "Copy raw transaction" to get the raw transaction.

But you're right, I think there's a bigger problem somewhere since the transaction wasn't broadcast.

If it's not in his mempool, he can just abandon it, it's one of the options in the same right-click menu (clickable for "not in mempool" txns).

Why? Guess you'll have to wait until it's finished since you've already started it.
Is your blockchain pruned?

Your 'Overview' tab's recent transactions are displaying 'labels' (eg. User1) instead of addresses and the bug is caused by those addresses' length.
And most importantly, those aren't your own addresses, "Payment to yourself" transactions have an icon with two arrows pointing on opposite direction,
yours are only upward indicating that those are "Sent to" transactions.
Those info are already explained in post number2.

To properly reproduce it, use your own addresses (from receive tab), do not add any label and do not use any your wallet's address with label to make sure that the transaction will display your addresses in the recent transactions.

The issue occurs when you have a transaction in the "Overview" tab that has multiple receipients.
Sending or receiving to multiple addresses will just add multiple entries per output (address) in that tab.

To properly reproduce it, follow this (use RegTest/Testnet, not Mainnet for testing):

• Get two or more addresses from the "Receive" tab.
• Go to "Send" tab of the same wallet and click "+Add Receipient" to add more "PayTo" fields.
• Paste the addresses in each PayTo field and enter the amounts you prefer, then finish creating the transaction.

One scenario where that example could happen is when a user consolidates his inputs (send all to self) by using two of his own wallet's receiving addresses as outputs.

It's always "false" by default and the fee should be covered by the input,
if its value isn't enough, Bitcoin core will have to include your other inputs or select the one with the right value,
otherwise, it will return with an error: "Insufficient funds"

Use sendmany (0.21.0/rpc/wallet/sendmany) instead of sendtoaddress and enable "subtractfeefromamount" for the "new address" to make sure that it wont generate a change address.
The tricky part is to set the correct amount up to the last satoshi, if it was set with lower amount, a change output will be added.

For example (RegTest):

• bcrt1qk3hqnujdex64v045qdh7df28vywg5rwtdzj008 - user's address that you'll pay.
• 2Mu9fzGjgnuvCrAJ1cuAu1vZGfDVzHZNHKU - your "new address" from other wallet that will receive the rest of the balance.

The example wallet's balance is 19.10239312 RegTestBTC, so the values of the outputs are 1 and 18.10239312 respectively.
But the final sent amount to 2Mu9fzGjgnuvCrAJ1cuAu1vZGfDVzHZNHKU is only 18.10238080 RegTestBTC because it's set with subtractfeefromamount flag "true".

I don't get the "issuer" part.
The addresses issued by an exchange is created from the private key of their bitcoin wallet software (eg.: Bitcoin core, other software or their own implementation of Bitcoin).

If you're looking for a way to tell if any random address belongs to an exchange or wallet, the one suggested by Bitcoin_Arena will work in some instances.
But not all services and exchanges are named, you'll mostly get "Wallet [NNNNNN]" names.

Note: It doesn't work like there's an "issuer data" or something but using "Blockchain Analysis" so the result you get can be false specially if the address was a part of a "CoinJoin" transaction.

Sometimes, I can't access the site but AFAIK, it used walletexplorer.com's API for the "Wallet Name" field. But now it always blank "-".
The "Tags" are submitted by users and will be added whether there's a proof or not (so you shouldn't trust that site's tags fully).