Bitcoin: What is the data format layout for txindex LevelDB values?

Here is an article on Bitcoin: Design of the data format for the level Txyndex levels level:

Understand the Bitcoin TXandex levels levels leveldb

Bitcoin is a decentralized open blockchain network that uses a new approach to manage its transaction index. The level txyndex 'in leveldb, a light data storage format, plays a crucial role in this process. In this article, we will deepen the design of the data format of the level Txyndex values ​​and explore the keys used in these peers.

The keys used in txandex

When you are considering the keys used in Txyndex Leveldb values, you may be surprised to know that they are quite different from those used in traditional databases. Bitcoin TXandex is designed to store and recover transaction data using a compact binary format. The keys used in this context are based on the structure of the Merkle tree of the block chain.

Pays of key values ​​

In Leveldb, the pairs of key values ​​are stored as a combination of a prefix (a fixed chain) and a suffix (the actual value). In the TXandex, these pairs of key values ​​are represented using a specific format. The keys used in the TXandex leveldb values ​​consist of two parts:

• Prefix

  : A haste of 32 bytes of the transaction ID.

• SUFIX : The actual value stored in the DB level database.

Key format

The key format for TXandex level values ​​is as follows:

''

''

Whereis a hash of transaction identification with 32 bytes, andThis is the actual value stored in the DB level database.

Example: 0x6A4E35F7-1C5B-4672-A77D-FDB74AAF3F33

In this example:

• 0x6a4e35f7it is a haste of 32 bytes of the transaction ID.

• -1C5B-4672-A77D-FDB74AAF3F33This is the actual value stored in the leveldb level database.

Data format design

When it stores a pair of key values ​​in Txyndex Leveldb, the following data format design is used:

''

+ ---------- +

| Prefix (32 bytes) |

+ ---------- +

|

|

V

+ ------------ ++ -------------

| Value | | Value |

+ ------------ ++ -------------

` ”

This design shows the two parts of the pair of key values: prefix and suffix.

Conclusion

In conclusion, Bitcoin TXndex level values ​​use a compact binary format to effectively store and recover transaction data. The keys used in this context are based on the structure of the Merkle tree of the block chain, which consists of a transaction identification hash at 32 bytes followed by the actual value stored in the level database DBA. It is essential to understand this pair of key values ​​to operate with the Bitcoin TXIDEX NIGLEDB TXIDEX values.

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