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Signature Minting

Signature Minting, also known as "on-demand minting," allows a contract administrator to grant users the ability to mint tokens from a contract that implements one of the extensions: ERC721SignatureMint, ERC1155SignatureMint or ERC20SignatureMint. This action requires a cryptographic signature and is limited to wallets assigned the MINTER role.

This allows you to conditionally generate signatures based on some condition/criteria, or allow a user to mint tokens with admin or user-specified metadata.


  • Ownership Verification: By requiring a signature, the system can ensure that the entity trying to mint a token has the right to do so.
  • Data Integrity: The cryptographic signature ensures that if the transaction data is altered, the signature becomes invalid.
  • Enhanced Security: Only MINTER-designated wallets can generate signatures, and only entities with the correct signature can mint tokens.
  • Smart Contract Control: By incorporating signature verification within the smart contract, you can add additional security logic around the minting process.
  • Reduced Risk of Human Error: Automated systems that require cryptographic signatures for minting are generally less prone to human error than manual methods.
  • Custom metadata: In the case of minting NFTs with signature minting, you can allow users to add custom artwork for their NFT metadata.
  • Whitelisting: Decide on a case-by-case basis whether a user can claim and what their claim conditions are.

Use Cases

Signature minting facilitates a range of use cases including, but not limited to:

Signature Minting in the Solidity SDK

Base Contracts


Add signature minting to your smart contract by using the following extensions:

Pre-Built Contracts Implementing Signature Minting

Example use cases that the thirdweb pre-built contracts solve:

  1. Self-Minting: For example, a user can mint their Twitter profile picture as an NFT on their own contract.
  2. Audience Minting:
    • Pre-defined Content: The admin pre-determines the nature of tokens, such as in a 10k NFT drop.
    • Dynamic Content: Tokens are not pre-defined, enabling real-time customization like a course completion certificate with the participant's name.

By implementing Signature Minting, you are adopting a scalable, secure, and versatile mechanism for minting digital assets.

Using Signature Minting in the SDKs