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Blocks are generated using Secure Hash Algorithms (SHA-256) after about one block per 10 minutes.
This results in a random block creation time of anywhere from 12:36:22 to 12:50:59.
The life of each block depends on the total accepted into the next block. The longest recorded blockchain contains 18,446,744 blocks, while the shorter one contains only 2,934 blocks.
Block data
The primary block data consists of:
Version of bitcoin being used (v0, v1, or v2)
Time the block was created
A one-way link to an existing block
Nonce / hex string for the proof of work
A merkle root of transactions for which this block is the latest ancestor block
The following fields in the transaction header are implemented for compatibility with the version of the bitcoin protocol being used, and are currently not used by the Bitcoin Core implementation:
This block's data
Prior block hash
Transaction Merkle root
Nonce
Size (bytes)
Size of a block in bytes
In block version 1, the nonce is 4 bytes long, while in block version 2 it is 8 bytes long.
The nonce, used for creating a proof of work, is a value used in bitcoin. A nonce is a unique number used only once in a given blockchain, similar to a counter. The purpose of the nonce is to prevent attackers from creating an unlimited number of blocks with value of 1 Bitcoin. The nonce (4 bytes) is concatenated with the time of creation of the block. The proof of work, based on a cryptographic one-way function, is encoded as a 256-bit integer. If the proof of work fulfills certain requirements, it is added to the block header. The proof of work is used to protect the network from attackers who attempt to create blocks in excess of the maximum number of blocks that will fit in a given amount of time. If the proof of work is successful the block will be added to the blockchain and all future blocks will be secured by proof of work. The nonce is incremented for each block to prevent attackers from creating blocks that will create valid proof of work. The nonce has nothing to do with the transaction fees.
Every block has a hash of the previous block and contains a link to it as part of the block header. As a result, the
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