Unlocking the Secrets of .rev* Files on Ethereum
Ethereum, a decentralized platform for creating smart contracts and decentralized applications (dApps), uses a variety of file formats to store and transmit data. One such format is .rev, which stands for “revocation” and is used to store revocation information for ERC-721 non-fungible tokens (NFTs). In this article, we’ll delve into the world of .rev files and explore what they contain.
The Structure of a .rev* File
A typical .rev* file consists of an array with [F9BEB4D9 + 32byte number + variable raw data] for each element. Here’s a breakdown of what this might look like:
[F9BEB4D9, 32byte_number, var_raw_data]
The first part, F9BEB4D9, is the magic number that identifies the file type. It’s not used directly in the data but serves as a unique identifier.
The second field, 32byte_number, represents an optional timestamp for when the revocation was recorded. This can be useful for auditing purposes or tracking the history of revocations.
The Variable Raw Data
The third field, var_raw_data, contains variable raw data that may include metadata, such as:
hash: a unique identifier for the NFT
metadata: additional information about the NFT (e.g., creator, description)
transaction_hash: a hash of a transaction that created or updated the NFT
This variable raw data is not strictly necessary and can be omitted if desired. However, it’s essential to note that omitting this field may lead to inconsistent revocation records.
Additional Information
It’s worth mentioning that .rev* files are stored on-chain, meaning they’re part of the Ethereum blockchain. They contain a specific set of rules for creating and maintaining these records.
Conclusion
In conclusion, .rev files on Ethereum provide a convenient way to store and manage revocation information for NFTs. While the structure is straightforward, it’s essential to understand the context in which these files are used. If you’re developing an application that interacts with ERC-721 NFTs or requires access to this data, familiarizing yourself with .rev file format can help streamline your development process.
Code Example
Here’s a simplified example of what a .rev* file might look like in Rust:
use eth_types::{Hash, U256};
struct Revocation {
timestamp: u64,
hash: hash,
metadata: [u8; 1024], // variable raw data (optional)
}
impl Revocation {
fn new(timestamp: u64, hash: Hash) -> Self {
Revocation { timestamp, hash }
}
}
Keep in mind that this is a highly simplified example and actual implementation may vary depending on the specific requirements of your project.
I hope this article has helped you understand more about .rev* files on Ethereum. If you have any further questions or need clarification on any aspect of this topic, feel free to ask!
