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Calculating Hashes on Ethereum: A Step-by-Step Guide
The Ethereum network uses a unique algorithm to create and validate transactions (Tx). One essential part of this process is calculating hashes, which are used to verify the integrity and authenticity of each transaction. In this article, we will explore how to calculate hashes on Ethereum, focusing specifically on Tx hashes.
What are hashes?
Hashes are one-way cryptographic functions that take input data (in this case, a Transaction) as an input and produce a fixed-size string output. The hash is unique and unalterable, making it perfect for verifying the authenticity of a transaction.
Calculating Hashes on Ethereum: A High-Level Overview
To calculate hashes on Ethereum, you need to follow these steps:
tx command in the Ethereum CLI:eth tx create
Replace
eth account command:eth account --send-receipt
This will create a new transaction with the double-sha256 hashed values.
eth hash command:eth hash --tx_hash
This will output the final hash of the Tx.
Fields to Double SHA Hash
To create a valid transaction, you need to include the following fields in your Tx:
Order of Fields
The order in which you include these fields does not matter. What matters is that they are included in the correct format.
Example Transaction
Here’s an example Tx:
{
"from": "0x1234567890abcdef",
"to": "0x9876543210fedcba",
"value": 10,
"gasPrice": 20000,
"gasLimit": 300000,
"nonce": 0,
"blockNumber": 1000
}
Double SHA-256 Hash Calculation
Using the eth account command, we can create a double-sha256 hashed input data:
{
"from": "0x1234567890abcdef",
"to": "0x9876543210fedcba"
}
The output will be a new transaction with the same hash value.
Final Hash Calculation
Combining the previous two hashes, we get:
eth hash = `1234567890abcdef@1234a5b6c7d8e9f0g0h1i2j3k4l5m6n7p8q9r10t11u184x15b13w1
This is the final hash of the Tx.
Conclusion
Calculating hashes on Ethereum involves creating a transaction, double-sha256 hashing its input data, and then combining these two hashes to create a final hash. By following this process, you can verify the integrity and authenticity of each transaction on the Ethereum network.
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