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ZeroMQ is a publisher / subscriber messaging system. In the case of Bitcoin Core it is a socket which other applications can connect to and get notifications of new events in real time, without having …

bitcoind supports the argument -stopatheight, which takes the number of blocks to download before halting. …

reindex doesn't also re-validate blocks, does it? It does, but signature verification (the slowest bit) is skipped on most of the early blockchain. The command attempts to sync with the network b …

listunspent only displays information about addresses which are currently part of your wallet. Bitcoin Core does not maintain indexes of unspent outputs for addresses you do not own, and will simply r …

bitcoin-cli invalidateblock `bitcoin-cli getbestblockhash` or bitcoind -maxconnections=0 …

You need to run your node with txindex=1 in the configuration in order to create one, and changing the option on an existing node requires you do do a bitcoind -reindex. …

Block rewards (coinbase outputs) can't be spent for 100 blocks. This is called "maturity" in the codebase and is to protect some behavior around reorganizations.

The RPC interface has a command getpeerinfo which will give a breakdown of upload and download metrics per connected peer. { .. "bytessent": 67619177, "bytesrecv": 47229533, …

1, 2 and 3. Transactions that arrive through inventory announcements on the network are validated completely by checking the form of the transaction for sanity, executing the script, checking signat …

If you want to retain any change, yes you will need two outputs to return unspent Bitcoin to yourself. If you are spending for example a 0.0001 BTC output, 0.0001 to fees, then a single 0 BTC OP_RETUR …

bitcoin-cli getinfo will show the number of connections. bitcoin-cli getpeerinfo will give information about individual connections.

They are files to assist reversing additions to the blockchain, handling reorganisations. They essentially contain the references needed to quickly reverse a block being accepted and it’s changes bein …

Bitcoins P2P network is a flooding design, new transactions and blocks are broadcast to every connected peer, and they broadcast to every one of their peers. Valid data reaches all participants very q …

Unless explicitly told otherwise, the datadir is always placed in /home/$USER/.bitcoin, there is no logic for automatically using any location other than this. The configuration file is always in the …

The regtest system is completely isolated from testnet and only exists on your local machine by default, you won't see the transaction from TPs faucet because it isn't on the same network. Blocks in y …