Solana: Initializing Token2022 Metadata with PDA mint authority
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Initialize the marker metadata with PDA Mint Authority: Step by Step
When designing a decentralized application (DAPP) that uses solana, it is important to treat marker metadata. One of the critical aspects of token management is the initialization of metadata with Disigt activity (PDA) in the mint administration. In this article, we check how to do this with a unique event and sign a smart contract.
Problem
It is used by Solana for traditional events such as « Init » for various purposes, such as initializing, creating new accounts or transferring tokens. However, if the marker metadata is needed in initializing the PDA, these traditional events cannot be used directly.
Solution: Initialize the marker metadata with the PDA Mint Authority
To solve the problem, we can create a unique event called « Init », which is used to initialize the marker metadata with the PDA mint administration. Here is an example of how the code looks:
`Rust
#[Derivative (accounts)]
#[Event_cpi]
The structures of the pub
#[Account (mut)]
PUB ID: PUBKEY, // The unique identifier of the new mint
Pub Owner: Account ,
Pub metadata: account // New marker metadata is stored here
}
In this example, we defined the « Init » event with three parameters:
1.
- « Owner »: Account responsible for creating a new money mint (« account » account)
- « Metadata »: New marker metadata account that stores initialized data
Calculation of smart contract
To calculate an individual event, we are creating a new intelligent contract that executes « Init ». Here is an example:
`Rust
Use Solana_program :: {{
Account_info :: {Next_account_info, Accountinfo},
Free point,
Program_Arror :: Program Error,
Program_Result :: Progressive,
};
Use core :: {serialize, desserialis};
#[Derivative (series, modern, debugging)]
Pub Struct InitParams {
ID: PUBKEY,
}
#[Derivative (accounts)]
#[Account (
signed_by = owner,
Pub Key_info = Keyinfo ,
PUB SYSTEM_PROPS_ID = Systemid,
Pub metadata_account_id = metadataAccountid,
Pub accounts = [
Accountid :: No_unique_key (MetadataAccountid),
]
))
The structures of the pub
PUB ID: PUBKEY,
}
In this example, we defined the « InitParams » structure to maintain the necessary input parameters and a new « Init » structure that performs the function « Accounts ». The « Init » structure is signed by the account responsible for the creation of a new cash register (ie owner).
Definition of the event
We use the following code to determine the event:
`Rust
A pub event init (
ID: PUBKEY,
Owner: Account ,
Metadata: MetadataAccountid,
) {}
In this example, we defined the « Init » event with three parameters:
1.
- « Owner »: an account responsible for creating a new cash register
- « Metadata »: New marker metadata -invoice ID
Program implementation
To implement an individual program, we create a new feature invited when you receive the event:
`Rust
Pub Fn Init (
ID: PUBKEY,
Owner: Account ,
Metadata: MetadataAccountid,
) -> programpressult {
// Initialize the marker metadata with the PDA Mint Authority
Let the mut metadata_account = Next_account_info! (metadata)?;
metadata_account.mint_id = ID;
OK (())
}
In this example, we defined the « Init » feature with three parameters:
1.
- « Owner »: an account responsible for creating a new cash register
3.
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