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@ -25,7 +25,7 @@ image::images/mbc2_0301.png["Bitcoin Core Architecture"]
[[compiling_core]] [[compiling_core]]
=== Compiling Bitcoin Core from the Source Code === Compiling Bitcoin Core from the Source Code
((("Bitcoin Core", "compiling from source code", id="BCsource03")))((("Bitcoin Core", "compiling from source code", "downloading")))((("code examples, obtaining and using")))Bitcoin Core's source code can be downloaded as a archive or by cloning the authoritative source repository from GitHub. ((("Bitcoin Core downloads")))On the https://bitcoincore.org/bin/[Bitcoin Core download page], select the most recent version and download the compressed archive of the source code, e.g. +bitcoin-0.15.0.2.tar.gz+. ((("GitHub bitcoin page")))Alternatively, use the git command line to create a local copy of the source code from the https://github.com/bitcoin/bitcoin[GitHub bitcoin page]. ((("Bitcoin Core", "compiling from source code", id="BCsource03")))((("Bitcoin Core", "compiling from source code", "downloading")))((("code examples, obtaining and using")))Bitcoin Core's source code can be downloaded as a archive or by cloning the authoritative source repository from GitHub. ((("Bitcoin Core downloads")))On the https://bitcoincore.org/bin/[Bitcoin Core download page], select the most recent version and download the compressed archive of the source code, e.g., +bitcoin-0.15.0.2.tar.gz+. ((("GitHub bitcoin page")))Alternatively, use the git command line to create a local copy of the source code from the https://github.com/bitcoin/bitcoin[GitHub bitcoin page].
[TIP] [TIP]
==== ====
@ -222,7 +222,7 @@ $ which bitcoin-cli
((("Bitcoin Core", "running core nodes", id="BCnode03")))((("bitcoin nodes", "running core nodes", id="BNcore03")))Bitcoin's peer-to-peer network is composed of network "nodes," run mostly by volunteers and some of the businesses that build bitcoin applications. Those running bitcoin nodes have a direct and authoritative view of the bitcoin blockchain, with a local copy of all the transactions, independently validated by their own system. By running a node, you don't have to rely on any third party to validate a transaction. Moreover, by running a bitcoin node you contribute to the bitcoin network by making it more robust. ((("Bitcoin Core", "running core nodes", id="BCnode03")))((("bitcoin nodes", "running core nodes", id="BNcore03")))Bitcoin's peer-to-peer network is composed of network "nodes," run mostly by volunteers and some of the businesses that build bitcoin applications. Those running bitcoin nodes have a direct and authoritative view of the bitcoin blockchain, with a local copy of all the transactions, independently validated by their own system. By running a node, you don't have to rely on any third party to validate a transaction. Moreover, by running a bitcoin node you contribute to the bitcoin network by making it more robust.
Running a node, however, requires a permanently connected system with enough resources to process all bitcoin transactions. Depending on whether you choose to index all transactions and keep a full copy of the blockchain, you may also need a lot of disk space and RAM. As of early 2018, a full-index node needs 2 GB of RAM and a minimum of 160 GB of disk space (see https://blockchain.info/charts/blocks-size). Bitcoin nodes also transmit and receive bitcoin transactions and blocks, consuming internet bandwidth. If your internet connection is limited, has a low data cap, or is metered (charged by the gigabit), you should probably not run a bitcoin node on it, or run it in a way that constrains its bandwidth (see <<constrained_resources>>). Running a node, however, requires a permanently connected system with enough resources to process all bitcoin transactions. Depending on whether you choose to index all transactions and keep a full copy of the blockchain, you may also need a lot of disk space and RAM. As of early 2018, a full-index node needs 2 GB of RAM and a minimum of 160 GB of disk space (see https://blockchain.info/charts/blocks-size[]). Bitcoin nodes also transmit and receive bitcoin transactions and blocks, consuming internet bandwidth. If your internet connection is limited, has a low data cap, or is metered (charged by the gigabit), you should probably not run a bitcoin node on it, or run it in a way that constrains its bandwidth (see <<constrained_resources>>).
[TIP] [TIP]
==== ====
@ -258,7 +258,7 @@ Using config file /home/ubuntu/.bitcoin/bitcoin.conf
... ...
---- ----
You can hit Ctrl-C to shutdown the node once you determined the location of the config file. Usually the configuration file is inside the _.bitcoin_ data directory under your user's home directory. Open the configuration file in your preferred editor. You can hit Ctrl-C to shut down the node once you determine the location of the config file. Usually the configuration file is inside the _.bitcoin_ data directory under your user's home directory. Open the configuration file in your preferred editor.
Bitcoin Core offers more than 100 configuration options that modify the behavior of the network node, the storage of the blockchain, and many other aspects of its operation. To see a listing of these options, run +bitcoind --help+: Bitcoin Core offers more than 100 configuration options that modify the behavior of the network node, the storage of the blockchain, and many other aspects of its operation. To see a listing of these options, run +bitcoind --help+:
@ -510,7 +510,7 @@ It will take some time, perhaps more than a day, for the +bitcoind+ client to "c
In <<cup_of_coffee>>, ((("use cases", "buying coffee", id="alicethree")))Alice bought a cup of coffee from Bob's Cafe. Her transaction was recorded on the blockchain with transaction ID (txid) +0627052b6f28912f2703066a912ea577f2ce4da4caa5a5fbd8a57286c345c2f2+. Let's use the API to retrieve and examine that transaction by passing the transaction ID as a parameter: In <<cup_of_coffee>>, ((("use cases", "buying coffee", id="alicethree")))Alice bought a cup of coffee from Bob's Cafe. Her transaction was recorded on the blockchain with transaction ID (+txid+) +0627052b6f28912f2703066a912ea577f2ce4da4caa5a5fbd8a57286c345c2f2+. Let's use the API to retrieve and examine that transaction by passing the transaction ID as a parameter:
++++ ++++
<pre data-type="programlisting"> <pre data-type="programlisting">
@ -530,7 +530,7 @@ ae24cb02204b9f039ff08df09cbe9f6addac960298cad530a863ea8f53982c09db8f6e3813014&#x
[TIP] [TIP]
==== ====
((("transaction IDs (txd)")))((("malleability")))A transaction ID is not authoritative until a transaction has been confirmed. Absence of a transaction hash in the blockchain does not mean the transaction was not processed. This is known as "transaction malleability," because transaction hashes can be modified prior to confirmation in a block. After confirmation, the txid is immutable and authoritative. ((("transaction IDs (txd)")))((("malleability")))A transaction ID is not authoritative until a transaction has been confirmed. Absence of a transaction hash in the blockchain does not mean the transaction was not processed. This is known as "transaction malleability," because transaction hashes can be modified prior to confirmation in a block. After confirmation, the +txid+ is immutable and authoritative.
==== ====
The command +getrawtransaction+ returns a serialized transaction in hexadecimal notation. To decode that, we use the +decoderawtransaction+ command, passing the hex data as a parameter. You can copy the hex returned by +getrawtransaction+ and paste it as a parameter to +decoderawtransaction+: The command +getrawtransaction+ returns a serialized transaction in hexadecimal notation. To decode that, we use the +decoderawtransaction+ command, passing the hex data as a parameter. You can copy the hex returned by +getrawtransaction+ and paste it as a parameter to +decoderawtransaction+:
@ -600,9 +600,9 @@ d50f654e788acd0ef8000000000001976a9147f9b1a7fb68d60c536c2fd8aeaa53a8f3cc025a8&#x
</pre> </pre>
++++ ++++
The transaction decode shows all the components of this transaction, including the transaction inputs and outputs. In this case we see that the transaction that credited our new address with 15 millibits used one input and generated two outputs. The input to this transaction was the output from a previously confirmed transaction (shown as the vin txid starting with +7957a35fe+). The two outputs correspond to the 15 millibit credit and an output with change back to the sender. The transaction decode shows all the components of this transaction, including the transaction inputs and outputs. In this case we see that the transaction that credited our new address with 15 millibits used one input and generated two outputs. The input to this transaction was the output from a previously confirmed transaction (shown as the vin +txid+ starting with +7957a35fe+). The two outputs correspond to the 15 millibit credit and an output with change back to the sender.
We can further explore the blockchain by examining the previous transaction referenced by its txid in this transaction using the same commands (e.g., +getrawtransaction+). Jumping from transaction to transaction we can follow a chain of transactions back as the coins are transmitted from owner address to owner address. We can further explore the blockchain by examining the previous transaction referenced by its +txid+ in this transaction using the same commands (e.g., +getrawtransaction+). Jumping from transaction to transaction we can follow a chain of transactions back as the coins are transmitted from owner address to owner address.