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Bitcoin Core supports creating a custom signet and mining utility for setting up a public test network with alternative functionality. This is not meant to be used to create an altcoin with actual or perceived monetary value as I (and many others) would recommend using a sidechain rather than attempting to start a new currency. Right now, I manage to run ...


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I mean if a large computer pool is used to attack a blockchain and modify the copy of the blockchain in 51% of computers in the network. Then due to consensus, the faulty blockchain will be replicated across the whole network. Thus changing the whole blockchain. It won't work. Large computers are terrible at mining. It's like trying to use a jet plane to ...


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You’re falling afoul of endianness. To promote equality, Satoshi sought to use Big Endian representation for hashes in Bitcoin, which have the byte order the opposite of what you are producing.


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You can't cancel a transaction. You can broadcast another transaction with a higher transaction fee (replace-by-fee) sending back to an address you own and hope that gets confirmed before the original transaction (miner is incentivized to mine this replacement transaction rather than the original one). Or alternatively you can ask the recipient to send the ...


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This is called arbitrage. It is theoretically possible to make money this way. Whether it is practically possible is another question. There was a feature of the market known as the 'Kimchi Premium', where it looked like this should have been possible with South Korean markets. However the capital controls and other regulations made this difficult or ...


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It is possible with json-rpc interface and one-time script. Enable json-rpc port by changing bitcoin.conf used by your Bitcoin Core (usually ~/.bitcoin/bitcoin.conf). https://ma.ttias.be/enable-the-rpc-json-api-with-password-authentication-in-bitcoin-core/ Start bitcoind/bitcoin core. Unlock your wallet using RPC walletpassphrase with timeout parameter ...


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You may have received such small amounts that it is impossible to accumulate them in one transaction due to the restrictions on the size of the transaction. Try sending 0.3 BTC and then 0.2 BTC in a second transaction (be prepared for unexpected large fees). It is also worth analyze your UTXOs. Maybe you have such small amounts that they are flagged as ...


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