Ethereum: What are the keys used in the blockchain levelDB (ie what are the key:value pairs)?

I will provide an article about Ethereum’s Blockchain structure and especially on Leveleldb and Node.js.

Ethereum Blockchain structure: A deep dive on Leveleldb

Ethereum Blockchain is a decentralized system for public registration with which transactions in the network can be checked and stored. To understand how this works, we have to break your underlying architecture.

Blockchain structure

Blockchain Ethereum consists of several layers:

• Block : A block is a collection of transactions. Each transaction consists of a sender, recipient, quantity and other relevant data.

• Strom : The electricity is the sequence of blocks from which the blockchain ether. Each block contains a hash of the hexadecimal representation of the front block.

• Header : The header is a clear identifier for each block. Contains metadata such as the date and clockwork record, the number of confirmations and more.

Leveleldb: A distributed database

To save blockchain data efficiently, Leveleldb, a distributed database, is used. Leveleldb enables searches, records and fast updates for large data records with low latency.

In the Ethereum Blockchain architecture, Leveleldb is used to store blocks and other metadata. This means that you can access certain blocks via your unique header -ID.

Key pairs/value

To understand how important couples work in Leveleldb, we should consider an example:

Suppose we want to restore the header of a block with the following key pairs: “Block_number”, “Timestamp” and “NOCE”.

• Block_number is a clear identifier for the block.

• TIMESTAMP represented when the block was created (in seconds since the UNIX time).

• Nance is an optional value that determines how often the block manufacturer can send transactions before it is confirmed.

In order to be able to access this data on Leveleldb, we would use the following key pairs:

| Key | Value |

| — | — |

| Block_number | 1234567890 (the real block number) |

| Timestamp | 1643723400,000z (The Timestamp) |

| Nance | 42 (optional value) |

In Leveleldb, this data is stored as hash by key value pairs:

`Json

{

“Block_number”: “1234567890”,

“Time Temple”: “1643723400,000z”,

“Nonce”: “42”

}

`

node.js and Leveleldb

To access the blockchain database directly via Node.js, you can use the “Leveleldb” package. Here is a simplified example:

`JavaScript

Constt Level = requires (‘level’);

// Create a new instance of Leveleldb

Const db = level (‘: memory:’); // ‘: memory:’ It is a special key that only enables storage databases

// Enter some data into the database

db.set (‘block_number’, ‘1234567890’, {TIMESTAMP: 1643723400,000z, Nonce: 42});

Db.set (‘transaction_hash’, ‘abcdefg’);

// Restore the header of a certain block with your ID

Consta block header = db.get (‘block_number’);

console.log (block header);

// update data to Leveleldb (optional)

db.update (‘block_number’, {timestamp: 1643723401,000z, Nonce: 43});

`

In this example we created a new instance of Leveleldb and inserted some data with Set (). Then we can restore the header with your ID from a certain block and update the data if necessary.

Diploma

The blockchain structure of Ethereum is based on efficient storage and restoration. If you understand how key pairs work in Leveleldb, you can use Node.js. However, remember that this requires a DBB level instance to be created and kept correctly.

stop wallet

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