Unfortunately I don't know the Mycelium wallet that well. But from what I understand it looks like you scanned/copied a public address and created a watch-only account. Could that be? Do you maybe remember doing this? If you can't reconstruct the private key than the bitcoins can't be accessed anymo...
I don't know the Core wallet that well.
Maybe it shows you the value at the time of the transaction.
In any case the value shown in the Core wallet is not that important.
The value you would receive depends on the market where you are going to sell the bitcoins.
The Bitcoin SegWit blocks are full and as a result only those who pay the highest fee get included in the block. Do you see your transaction on a block explorer as unconfirmed? e.g. on https://www.blockchain.com/ . If your fee is to low you can try to accelerate it here: https://pool.viabtc.com/tool...
You have used many inputs which made your transaction bigger. The fee you have chosen is 35sat/B which is too low because the mempool is full. (this is a big problem with Bitcoin SegWit and why Bitcoin Cash has forked in August) Fortunately you have enough fees to accelerate it here: https://pool.vi...
My guess is that you are using hashflare.io for the cloud mining. I don't know why the tx can't be seen in any other block explorer. It could be that they don't broadcast the tx and will mine it themselves at some point. The transaction fee would be too low to get included by other miners at the mom...
You need to do this from the wallet console. I don't know how to get there on a Mac. Please search for it in the menu. Once you are in the console type the following. 1. walletpassphrase "your password" 600 (only if you have a wallet password) 2. dumpprivkey [your public address] (the address on whi...
Bitcoin (SegWit) fees are high at the moment. But 0.01 sounds a bit too much. Maybe it would make sense to export the private key and sweep it into a modern client like Electrum . Because you were in possession of the bitcoin before August 1st 2017 you also have Bitcoin Cash on that address. I recom...
Did you create a SegWit address in Electrum and send the Bitcoin Cash to it? If this is the case then you need help from a miner to get the bitcoins back. I heard that btc.com helps. What is important is that you don't spend from the same SegWit address on the Bitcoin (SegWit) network. If you do so ...
There is no technical reason. It is a safety feature for users. Most wallet work with a BIP39 seed. Meaning that you can recreate all addresses with only the seed. Some people used to import private keys to those wallets and did not realize that the imported private key would not be recoverable usin...
I don't think you can import the armory wallet to any other client. You could export the private key from armory and sweep the bitcoins into your new wallet. (Meaning a transaction will be created to move the bitcoins to the old address from armory to the new address in the bitcoin wallet) If you ha...
You should never give your private key to any other person or homepage.
If someone is asking you to do this it is very likely that they want to steal your bitcoins.
What is it you want to do exactly and what 3rd party wants your private key?
If you use the bitcoin.com wallet you will have to wallets but both use the same seed and thus should receive the Bitcoins. A problem could be if you transacted more with Bitcoin Cash and thus the addresses have advanced more on that wallet than on the other. You can go to Settings -> [you Core wall...
Electrum works only for Bitcoin.
The Electrum client has been forked as Electron Cash to support Bitcoin Cash and can be downloaded from https://www.electroncash.org/.
You should be able to use the same seed as with Electrum to create the Electron Cash wallet.
If you use the Bitcoin.com wallet you can see all addresses under Settings -> [your wallet] -> More options -> Wallet addresses Start at the top and check them in the block explorer. BTC: https://explorer.bitcoin.com/btc/ Once you found it check how many sat/B you are paying for the fees and let me ...
The Bitcoin SegWit chain is congested and the mempool is very high thus transactions can take very long.
(Although it is interesting that the transaction is not even in the mempool)
Did you check with Bitpay given that both the wallet and the credit card are from them?