By the end of this tutorial, you'll see the first block on the Bitcoin blockchain, created by Satoshi Nakamoto.You'll also see how Bitcoin Core stores blocks on your disk.The first block on the Bitcoin blockchain—block 0—is called the Genesis Block.According to the timestamp in the block header, it was mined on 3 Jan 2009 at 18:15:05 UTC, although (as you'll learn) it contains more proof of work than we'd expect and the mining was only started on January 3rd.Let's take a look at it on the disk of your computer by running the following commands: The cd command changes your directory into the Bitcoin Core block data directory.The hexdump command above displays the first 255 bytes of the file.It should look like this: The output has three columns: The left side is the byte count; it starts at zero and increases by 16 bytes on each line except the last.The middle part is each byte with a space between it and the next byte.

Bytes are represented here in hexadecimal which takes two characters to represent a single byte.When we refer to byte sequences below, we'll use the common prefix of 0x.For example, the first byte in the output is 0xf9.On the right is the ASCII text representation of the hexadecimal data.Bytes that don't map to displayable ASCII are shown as periods.Almost none of the data in the blockchain is ASCII, but Nakamoto left us a surprise here (see below for details).Note the first four bytes, 0xf9beb4d9.This is called "Bitcoin's magic number", although it isn't really magical.It's just four arbitrary bytes chosen by Nakamoto as a byte sequence otherwise unlikely to appear in a Bitcoin datastream.In the block data files, these bytes identify the start of a new block but they aren't part of the block themselves.These bytes also start each message in the Bitcoin peer-to-peer network protocol to help clients tell when one message ends and another begins.

You'll note that the early part of the block contains many zero bytes (0x00).That's because the Genesis Block, unlike every other Bitcoin block, doesn't reference a previous block—it just references a long string of zeroes.This is truly the beginning of the Bitcoin blockchain.Finally, in the ASCII text section, you'll see the message Nakamoto left us: This was part of a special field in the special first transaction of a block, called a coinbase transaction.In Nakamoto's day, this field allowed miners to include up to 100 bytes of arbitrary data in each block they made.Today, that's been reduced to 97 bytes, but still most miners include a message of some sort in every block they make.Nakamoto's message is especially important.It's the actual headline (although slightly garbled) of a real newspaper, the Financial Times, from the indicated date.This message, which may also express some of Nakamoto's frustration with the pre-Bitcoin financial system, provides extremely strong evidence that Nakamoto couldn't have mined his block earlier than the morning of January 3rd.

(Based on the second block on the blockchain, dated January 8th, it's likely that Nakamoto didn't actually finish mining the Genesis Block until a few days later.)Why is this important?We also know that Nakamoto announced that the Bitcoin software was available on the 8th, and that there was another notable user (cryptographer Hal Finney) a few days later, so the proof that he didn't start mining until the 3rd shows that Nakamoto didn't attempt to mine all the early blocks himself in an attempt to create some sort of Ponzi scheme.bitcoin mining with nvidia geforceIf you want to see more of the blockchain, replace the number 255 in the command above with a higher number—but beware, the blockchain is pretty boring for its first few ten thousand blocks.bitcoin generator отзывы

Because the Genesis Block is unlike all other Bitcoin blocks, Nakamoto had to use custom code to mine it.In the next tutorial, we'll help you write your own CPU Bitcoin miner to re-create the exact same block Nakamoto mined as well as learn about what data regular miners include in their block headers.Jump to: , A genesis block is the first block of a block chain.Modern versions of Bitcoin assign it block number 0, though older versions gave it number 1.The genesis block is almost always hardcoded into the software.ethereum classic walletIt is a special case in that it does not reference a previous block, and for Bitcoin and almost all of its derivatives, it produces an unspendable subsidy.bitcoin difficulty riseHere is a representation of the genesis block[1] as it appeared in a comment in an old version of Bitcoin (line 1613).litecoin rehc

The first section defines exactly all of the variables necessary to recreate the block.The second section is the block in standard printblock format, which contains shortened versions of the data in the first section.The hash of the genesis block, 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f,[1] has two more leading zeroes than were required for an early block.The coinbase parameter (seen above in hex) contains, along with the normal data, the following text:[2] This was probably intended as proof that the block was created on or after January 3, 2009, as well as a comment on the instability caused by fractional-reserve banking.fidelity bitcoin fundAdditionally, it suggests that Satoshi Nakamoto may have lived in the United Kingdom.The original newspaper from which this title was taken has become a collector's item, and very few copies have been identified.The first 50 BTC block reward went to address 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa,[1] though this reward can't be spent due to a quirk in the way that the genesis block is expressed in the code.