Native Token Transfers

Native Token Transfers (NTT) by Wormhole Foundation is a composable, open-source framework designed to enable token transfers across multiple blockchains without relying on liquidity pools. It provides developers with granular control over token behavior on each chain, including token standards and metadata management. The framework supports two main modes: "locking" mode, which preserves the original token supply on a single chain by locking tokens during transfer, and "burning" mode, which allows deployment of natively multichain tokens with distributed supply across chains. This flexibility makes NTT suitable for projects aiming to implement secure and customizable cross-chain token transfers.

The architecture consists primarily of two components: the Transceiver contract, which handles sending token transfers forwarded through the NttManager on the source chain and delivers them to the peer NttManager on the destination chain; and the NttManager contract, which manages tokens, transceivers, rate-limiting, and message attestation. Transceivers implement the ITransceiver interface and can be customized independently of Wormhole core, allowing integration with various verification backends. The NttManager is token-specific but can control multiple transceivers, enabling flexible multi-chain token management.

NTT also includes features like amount trimming to handle token decimals differences across chains without destroying token "dust," and rate-limiting mechanisms on both sending and receiving chains to prevent network congestion. Additionally, cancel-flows help mitigate transfer delays caused by frequent bridging between specific chains by adjusting rate limits dynamically. Governance is supported through Wormhole Guardians, enabling decentralized contract governance across EVM and Solana runtimes. Developers can get started by deploying NttManager and Transceiver contracts configured for their tokens and chains, carefully choosing locking or burning modes to ensure safe transfers. Comprehensive documentation and community support are available to assist integration and customization.