Yes there is. I was rescanning my bitcoin wallets from 2013 and 2015, because they are worth more now. It turned out to be the exact same wallet, and I made payments from these two wallets to my v0.20.0 BTC client.
I didn't even wait till the wallet was rescanned, and frankly i spended bitcoins i didn't own. So the transaction was conflicted and thrown out of the mempool before reaching a block. So then I had two wallets with a conflicting transaction.
I tried and some other things, but the transaction was not eligable for abandoning.

What you do in this case?

should be fully up-to-date with the blockchain.
Go to your conflicted wallet's transactions and copy the transaction ID of the transaction you should delete.
Then go in the console and export the wallet to a textfile. It's in the same directory as .
Have a texteditor with linenumbers. Find the line with the transaction ID, say it's line 678 of a textblock starting at line 5. Now go to the empty line halfway of the textfile, say the first line of the next block is 3413. Now that textblock is just as long as the first block of text.
should be deleted now. After that, delete line 678.
Don't mess this up or you'll end up a loosing money!
line 678:
is a secret encoded key, the date and time, transaction label, and input/output address.

line 4086:
are tuples of the same data, they only have encoded data.

So delete these lines and now go to the BTC client console
Now the full blockchain will be rescanned with your wallet, it will take four hours or so.
And you have your BTC back!

The EvaCoin Developers announce a new altcoin: The EvaCoin !

This is not the existing X11 Eva-coin, sold on Yobit for satoshi's (10 pico-Bitcoin, $0,00015), but a new sha256d cryptocoin, much like Bitcoin.

In fact, the wallet software is based on our good old Bitcoin client 0.8.2 from 2012 in a 'new coat'.

This makes EvaCoin the ultimate coin 'for techies': Their old deprecated bitcoin mining hardware will get a new use for mining EvaCoin.

What makes the EvaCoin special and outstanding?

Again, technology is the answer! The network is inherently stable while each transaction is dealt with in 10 minutes.

It even allows for a decrease in network hash rate, as opposed to any other crypto coin.

Please preview the wallet software, excelling in simplicity. 

 

Now let's talk about money. The EvaCoin has no premine at all. The network's age is three hours at the time of writing.

Join the network and step in now. Read more and download the wallet: https://github.com/Gerjan77/EvaCoin/wiki

 

It means yes, and it's a huge amount: 49.000.000 NED, which is 70% of all total available coins.
and actually it was not mined, it was generated in the genesis block:
https://chainz.cryptoid.info/ned/block.dws?1.htm

Why the premine?

The premine went to the not Evil wallet. These funds are used to pay the users that are part of the not Evil Rewards program and actively searching on the Dark Web. Find the search engine here : hss3uro2hsxfogfq.onion



Unfortunately, I don't own any of the genesis coins.

18:39:45

{
"blocks" : 3536,
"currentblocksize" : 0,
"currentblocktx" : 0,
"difficulty" : 196218.70779873,
"errors" : "",
"generate" : false,
"genproclimit" : -1,
"hashespersec" : 0,
"pooledtx" : 0,
"testnet" : false
}

There is no mining pool just yet. It is now useful, since our network hashrate just went up to 700 GH/s. No more solo mining..
Just reply and tell me the hashrate of your hardware. If we have enough hashrate to start, i will set up a mining pool.
My hardware is an old 300 MH/s Saphire block erupter.

notEvilDime (NED) logo:http://i.imgur.com/NGCmpvm.png

Algorithm SHA256
Type PoW
Address letter N
RPC port 17934
P2P port 17933
Premine Y
Block reward 50 coins
Block halving 210000 blocks
Total coin supply 70000000 coins
Coinbase maturity 20 blocks
Target spacing 5 minutes
Target timespan 10 minutes
Transaction confirmations 6 blocks

Download the Wallet: https://github.com/Gerjan77/notEvilDime/releases

Blockchain info: https://chainz.cryptoid.info/ned/

Wiki: https://github.com/Gerjan77/notEvilDime/wiki

I had no luck getting my transaction confirmed. But abandoning the transaction in bitcoin-qt worked:

• Go to the Bitcoin Core datadirectory and delete the mempool.dat file
• Restart Bitcoin Core with the -walletbroadcast=0 option
• Go to the transactions list, right click the transaction that is stuck. It is no longer greyed out! Choose the Abandon Transaction option.

I'm trying to move 0.01360100 BTC to Bitsane Exchange, but it is unconfirmed. Can you help me? I'll make a donation 

https://blockchain.info/tx/2d8a50fd915ac77493d5aa79e7668aef55072d4797aff0da903c0da232d4b54b