He is the inventor of Cypherpunk and Hashcash. Here are the best ones available by category (detailed reviews can be found at the bottom of this post Bitcoin wallet comparison table, the complete beginners guide to Bitcoin wallets. AdditionallyRead more
The total number of bitcoins, as mentioned earlier, has an asymptote at 21 million, due to a side-effect of the data structure of the blockchain - specifically the integer storage type of the transaction output, this exact value wouldRead more
than one wallet address was involved (if you sent more than a single address held, for example). As unfortunate as it is, transactions on the Bitcoin network are designed to be irreversible and nobody has control over them. And, cancelling an unconfirmed tranasaction by @theymos (ackexchange) there are some tricks to hide your initial transaction from miners by creating a so called "non-standard" transaction. To motivate miners to include this transaction instead of the original one, you increase the transaction fee. The third one is required to enable RBF feature. I was able to use. You cant actually cancel a transaction, but you can replace it with a higher fee so it gets confirmed. Localbitcoins used to allow this, but does no longer. This payment is shown as Replaceable at the history tab before being accepted in the network. Use, bitcoin Wallet by s tools to replicate the transaction but leave off a higher fee.
Yes, obviously it is possible. After you get the requested confirmations for your new transaction, your Bitcoin will be safe in your wallet and the original transaction will be rejected as many nodes will reject double spending transactions. If that is not the case and your transaction has 0 confirmations, you might be able to double spend. Transaction replacement was introduced by Satoshi in the first release of the Bitcoin software, but later removed due to denial-of-service problems. If you have a passphrase on your wallet, use walletpassphrase "passphrase" timeout where timeout is in seconds (how long to allow commands without needing to do this again for other commands). Bitcoin: A Peer-to-Peer Electronic Cash System. However, not all miners honor this flag and some might still include your initial transaction. Read The story of John Mcafee and his bitcoin bet (still on, btw). Which was not yet broadcasted? You will need bypass the friendly UI of your wallet (or check if your wallet software supports RBF natively, some might do at this point). Bitpay encounterd zero double spents in the first 10000 transactions.