Creating your own experimental Bitcoin network

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Bitcoin is a decentralised digital currency which has been growing rapidly in popularity and use. This blog post covers some technical topics about the Bitcoin block chain, which you might want to read up on the subject beforehand. The standard Bitcoin client, Bitcoin Core has three networks it can run on: This is the real Bitcoin network, with the block chain that everyone uses.

Every now and then the developers nuke the ledger to prevent selling off testnet bitcoins, and also to reset the mining difficulty low enough so a CPU can effectively mine. Currently it is called testnet3. The testnet runs on a different TCP port, has a different genesis blockand the Bitcoin addresses start with different letters. New in Bitcoin Core 0. It also has its own genesis block, and when you start your client, no peers are registered, and nothing is initially mined by anyone.

After the initialisation of the Bitcoin Core daemon, i. I have created a Docker image which simply allows you to run Bitcoin Core in a Docker container. After cloning the repository, hop into it and run:. There is a version 0. We are going to run two docker instances, one for Alice and one for Bob. Both containers will run their own Bitcoin peer using bitcoindand initially the only thing in common will be the regtest genesis block which is hard-coded in Bitcoin Core.

Run the following commands in their own windows:. Bitcoin testnet blockchain size bitcoind on both containers like so:. The rest of the examples will use this. Using rt, this is the equivalent of the previous command:. Right now there are no mined blocks, and no peers connected. A log entry in both peers should appear similar to the following.

If not, try it again bitcoin testnet blockchain size wait a bit. Just on Alice, run setgenerateand once that is done, check out your new, freshly mined 50 bitcoins:. Bitcoin testnet blockchain size rewards are released after confirmations why?

To do this, just get one of the nodes to quickly mine 6 blocks:. And the final screenshot shows Bob just received 6 blocks and his balance is now 42 bitcoin testnet blockchain size.

The Bitcoin Core bitcoin testnet blockchain size loading screen.

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The testnet is an alternative Bitcoin block chain , to be used for testing. Testnet coins are separate and distinct from actual bitcoins, and are never supposed to have any value. This allows application developers or bitcoin testers to experiment, without having to use real bitcoins or worrying about breaking the main bitcoin chain. There have been three generations of testnet. Testnet2 was just the first testnet reset with a different genesis block, because people were starting to trade testnet coins for real money.

Testnet3 is the current test network. It was introduced with the 0. Testnet uses a different genesis block to the main network. You can find it here or here.

The testnet was reset with a new genesis block for the 0. Testnet receives less transactions than the main block chain and is typically much smaller in size. As of January the size of the data on disk was 14GB, containing data for about 6 years worth of testnet activity. Once you're done with your test coins, it is a nice gesture to send them back to the faucets, so they become available to other developers. Retrieved from " https: Technical Developer Bitcoin Core documentation. Navigation menu Personal tools Create account Log in.

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