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Ethereum surgery understanding: Prev_out and N
Blockchain.info provides API information about blockchain operations. When working with their API, the developers often face two specific data points that may, at first glance, make fun of: Prev_out and N. In this article, we will delve into what these values are in the context of Ethereum transactions.
Prev_out
Prev_out is an object that appears in every Ethereum Blockchain operation. This demonstrates the output which was sent to a certain address (also known as the “recipient”) during the operation. In other words, Prev_out is information about the amount of ether (ETH) or other chips transferred from the sender’s wallet.
Each Prev_out object has three main components:
- Sum : Total ETH or other chips sent to the recipient.
- Address : Address, which is a output that is usually a public key, such as 0x … (eg 0x1234567890abcdef).
- ** values’: a logical tool indicating whether the operation was sent as a single ETH input (1) or several ETH input (0).
n
The value of each Prev_out object “N” is always equal to either 0 or 1. Ethereum are three available “n” values ::
0: One ETH input was sent.
1were sent several ETH input.
This difference is very important as it affects certain intellectual contract operations and interaction with Ethereum decentralized funding (Defi) ecosystem.
interpretation
When working with operations using Blockchain.info API, consider the following scenarios:
- If the operation also contains Prev_out objects over 0, it indicates that the same input is used for multiple exits. This can be a problematic interaction between the intellectual contract as it can lead to unexpected behavior.
- When “n” is 1, you can use the appropriate amount of ETH directly without any additional treatment.
the best practice
To ensure accurate and reliable data processing when working with Ethereum operations, follow the following guidelines:
- Always check the Prev_out.n value.
- Be careful when using multiple input for one -off exits (i.e. values higher than 0).
- Carefully consider the analysis of the operations data to avoid possible problems.
Understanding what Prev_out and N represent Ethereum operations, developers can better navigate “blockchain.info” API and ensure reliable functionality in their applications.