Here is an article on the format of the content of a block key at the Bitcoind level:
Understand the key block content format at the Bitcoind level level
When working with the Bitcoind LeveldB block index files, it is essential to understand the format of the block keys and their contents. This is crucial to efficiently search for specific blocks within the database.
What are block keys?
The block keys, also known as block id or block numbers, are unique identifiers assigned to each block in a bitcoin block chain. They serve as labels that help Bitcoind identify which block to process below during the validation and verification process of the block.
Format of the content of a block key
The format of the content of a block key is generally represented by an integer of 64 bits (8 bytes) that contains several fields, which include:
0x01: A bit indicator that indicates whether the block key is valid
0x00-0x7f: Additional information about the block, such as its time and/or other metadata brand
The most commonly used format of the content of a block key at the Bitcoind level is:
`
0x01 (validity)
| 0x00 0x00 0x00 0x00 (Time brand)
seconds from the beginning of the time
| 0x01 (metadata, for example, time brand, size, etc.)
0X08-0X07 (Block ID, a 64-bit integer)
0x00-0x7f (additional metadata or flags)
Specific block bytes position
To find the position of byte of specific blocks within the database, you can use the 'blk field in the content of the block key. This field indicates the initial address of a block.
For example, if you have a block key with a validity indicator of 0x01 and metadata that indicate an 0x12345678 block, the byte position of that specific block would be:
`
0x08-0x07 (block id: 0x12345678)
initial address
Example use case
Suppose you want to find a specific block within the database. You can create a 'blk field with the desired byte position and metadata, such as:
`Bash
Blk00029.dat | 0x01 (validity) | 0x08-0x07 (block id: 0x12345678)
Then, you can use the Bitcoind LeveldB command line tool (Bitcoind -DB Route/A/DB -Query Blk00029.dat | Grep Block_id: 0x12345678) To search for the specified block.
By understanding the format of the content of a block key and using the 'blk field with the desired byte position, you can efficiently find specific blocks within the Bitcoind Leveldb database.