Skip to main content

Token Chain

Overview​

The Token Chain is a dedicated Chromia-based blockchain designed to streamline token management, account creation, and cross-chain asset bridging.

Key benefits​

  • Simplified bridging setup: the Token Chain automates setup on the Chromia side, streamlining the process. Future updates aim to automate the EVM side as well for greater efficiency.

  • Enhanced trust and security: listing tokens on the Token Chain increases their credibility and provides a secure environment.

  • A secure hub for tokens: the Token Chain serves as a trusted system chain. Tokens can be moved back to the Token Chain for security during updates or changes on a dapp chain.

  • Streamlined onboarding: users of multiple projects on the Token Chain already have an account for bridging, simplifying access to new projects.

  • Greater flexibility: tokens are independent of any single dapp chain. If dissatisfaction arises with a dapp's development, tokens can be transferred to a new forked version that aligns better with user preferences.

Architecture​

Account creation strategy​

Each project maintains a pool of CHR on the Token Chain specifically for creating new accounts. You can choose:

  • Open pool: anyone can request an account by paying a nominal fee.
  • Minimum amount strategy: require a minimum CHR deposit per new account to prevent spam.

Account creation on behalf of projects is authorized via ICCF and requires a list of blockchain RIDs for the chains allowed to create accounts. Fees for account creation are sent to a Chromia Foundation–managed account, and foundation members can redistribute these funds back to the economy chain or allocate them to the project's resource pool.

Token minting policies​

The built-in minting capability in FT4 allows you to use its before and after hooks to enforce minting policies. Token proposals include:

  • Maximum supply (optional)
  • Authorized minters
  • Minting interval and amount
  • Accumulative vs. fixed-rate modes
  • Option to specify rate and maximum supply per minter

Example RELL struct:

struct minting_policy {
  minters: set<byte_array>;
  max_supply: big_integer;
  minting_interval_ms: integer;
  minting_amount: big_integer;
  accumulating_amount: boolean;
}

Repository​

The Token Chain is open source and available on GitLab:

Repository: https://gitlab.com/chromaway/core/directory-chain/-/tree/dev/src/token_chain

This repository contains the complete Token Chain implementation, including:

  • Token proposal and management functionality
  • Account creation strategies and policies
  • Bridge configuration and deployment
  • Minting policies and controls
  • ICCF operations for cross-chain communication
  • Integration with the Directory Chain ecosystem