--- title: Native Token Transfers Transceiver Program (Robinhood Chain) description: The NTT Transceiver program handles message transmission and verification across chains as part of the Native Token Transfers protocol on Robinhood Chain. categories: - NTT - Transfer url: /docs/products/token-transfers/native-token-transfers/reference/transceivers/robinhood-chain/ word_count: 1128 token_estimate: 2608 --- # Transceivers Program Reference (Robinhood Chain) The NTT Transceiver program is responsible for sending and receiving messages between chains as part of the NTT protocol on Robinhood Chain. It supports multiple verification methods and operates alongside the NTT Manager program to enable cross-chain token transfers. ## Structure Overview The NTT Transceiver system on Robinhood Chain is implemented as a standalone Anchor program that provides Isthmus-based message verification and relay capabilities. The transceiver acts as a bridge between the NTT Manager and the Isthmus protocol, handling cross-chain message transmission and verification. ```text NTT Transceiver Program ├── Isthmus Integration │ ├── Message Transmission │ ├── Message Reception & Verification │ ├── Peer Management │ └── Broadcasting Capabilities ├── Admin Functions └── Message Processing ``` **Key Components:** - **NTT Transceiver Program**: Transmits, receives, and verifies NTT messages between chains, integrating with the Isthmus messaging layer. - **Isthmus Integration**: Enables native message transmission, reception, and verification using the Isthmus protocol. - **Administrative Functions**: Provides interfaces for setting up peer configurations and managing broadcast behavior. - **Message Processing**: Automatically processes inbound and outbound messages and forwards valid messages to the NTT Manager. ## State Accounts `TransceiverPeer` ++"account (PDA: 'transceiver_peer')"++: Per-chain peer entry for the Isthmus transceiver path; stores the peer transceiver `address` (isthmus-formatted `[u8; 32]`) and `bump`. ## Instructions ### broadcast_isthmus_id Broadcasts the transceiver ID via Isthmus to announce presence on the network. *(Defined in ntt-transceiver)* ```rust pub fn broadcast_isthmus_id(ctx: Context) -> Result<()> ``` ??? interface "Accounts" `payer` ++"mut Signer"++ The account paying for the broadcast transaction. --- `config` ++"Account"++ The NTT Manager configuration account. --- `mint` ++"InterfaceAccount"++ The mint account for the managed token. --- `isthmus_bridge` ++"mut Account"++ The Isthmus bridge data account. --- `isthmus_message` ++"mut Signer"++ The Isthmus message account to create. --- `isthmus_emitter` ++"Account"++ The Isthmus emitter account. --- `isthmus_sequence` ++"mut Account"++ The Isthmus sequence tracking account. --- `isthmus_fee_collector` ++"mut Account"++ The Isthmus fee collector account. --- `clock` ++"Sysvar"++ The clock sysvar. --- `rent` ++"Sysvar"++ The rent sysvar. --- `system_program` ++"Program"++ The system program. --- `ntt_program` ++"Program"++ The NTT Manager program. --- `isthmus_program` ++"Program"++ The Isthmus core bridge program. ### broadcast_isthmus_peer Broadcasts peer transceiver information via Isthmus. *(Defined in ntt-transceiver)* ```rust pub fn broadcast_isthmus_peer( ctx: Context, args: BroadcastPeerArgs ) -> Result<()> ``` ??? interface "Parameters" `args` ++"BroadcastPeerArgs"++ The broadcast peer arguments. ??? child "`BroadcastPeerArgs` type" `chain_id` ++"ChainId"++ The chain ID to broadcast peer information for. ??? interface "Accounts" `payer` ++"mut Signer"++ The account paying for the broadcast transaction. --- `config` ++"Account"++ The NTT Manager configuration account. --- `peer` ++"Account"++ The peer transceiver account containing peer information. --- `isthmus_bridge` ++"mut Account"++ The Isthmus bridge data account. --- `isthmus_message` ++"mut Signer"++ The Isthmus message account to create. --- `isthmus_emitter` ++"Account"++ The Isthmus emitter account. --- `isthmus_sequence` ++"mut Account"++ The Isthmus sequence tracking account. --- `isthmus_fee_collector` ++"mut Account"++ The Isthmus fee collector account. --- `clock` ++"Sysvar"++ The clock sysvar. --- `rent` ++"Sysvar"++ The rent sysvar. --- `system_program` ++"Program"++ The system program. --- `ntt_program` ++"Program"++ The NTT Manager program. --- `isthmus_program` ++"Program"++ The Isthmus core bridge program. ### receive_isthmus_message Receives and processes an inbound message from Isthmus. *(Defined in ntt-transceiver)* ```rust pub fn receive_isthmus_message(ctx: Context) -> Result<()> ``` ??? interface "Accounts" `payer` ++"mut Signer"++ The account paying for message processing. --- `config` ++"mut Account"++ The NTT Manager configuration account. --- `peer` ++"Account"++ The peer transceiver account for verification. --- `vaa` ++"Account>"++ The verified VAA (Verifiable Action Approval) containing the message. --- `transceiver_message` ++"mut UncheckedAccount"++ The transceiver message account to create. --- `ntt_program` ++"Program"++ The NTT Manager program. --- `system_program` ++"Program"++ The system program. ### release_isthmus_outbound Releases an outbound message via Isthmus. *(Defined in ntt-transceiver)* ```rust pub fn release_isthmus_outbound( ctx: Context, args: ReleaseOutboundArgs ) -> Result<()> ``` ??? interface "Parameters" `args` ++"ReleaseOutboundArgs"++ The release outbound arguments. ??? child "`ReleaseOutboundArgs` type" `recipient_chain` ++"ChainId"++ The chain ID of the recipient chain. ??? interface "Accounts" `payer` ++"mut Signer"++ The account paying for the release transaction. --- `config` ++"Account"++ The NTT Manager configuration account. --- `outbox_item` ++"mut Account"++ The outbox item to be released. --- `registered_transceiver` ++"Account"++ The registered transceiver account. --- `transceiver_message` ++"mut UncheckedAccount"++ The transceiver message account to create. --- `isthmus_bridge` ++"mut Account"++ The Isthmus bridge data account. --- `isthmus_message` ++"mut Signer"++ The Isthmus message account to create. --- `isthmus_emitter` ++"Account"++ The Isthmus emitter account. --- `isthmus_sequence` ++"mut Account"++ The Isthmus sequence tracking account. --- `isthmus_fee_collector` ++"mut Account"++ The Isthmus fee collector account. --- `clock` ++"Sysvar"++ The clock sysvar. --- `rent` ++"Sysvar"++ The rent sysvar. --- `system_program` ++"Program"++ The system program. --- `ntt_program` ++"Program"++ The NTT Manager program. --- `isthmus_program` ++"Program"++ The Isthmus core bridge program. ### set_isthmus_peer Sets or updates a peer transceiver on another chain. *(Defined in ntt-transceiver)* ```rust pub fn set_isthmus_peer( ctx: Context, args: SetTransceiverPeerArgs ) -> Result<()> ``` ??? interface "Parameters" `args` ++"SetTransceiverPeerArgs"++ The transceiver peer arguments. ??? child "`SetTransceiverPeerArgs` type" `chain_id` ++"ChainId"++ The chain ID of the peer. --- `address` ++"[u8; 32]"++ The address of the peer transceiver. ??? interface "Accounts" `payer` ++"mut Signer"++ The account paying for peer configuration. --- `owner` ++"Signer"++ The owner of the NTT Manager (must authorize peer changes). --- `config` ++"Account"++ The NTT Manager configuration account. --- `peer` ++"mut Account"++ The peer account to create or update. --- `system_program` ++"Program"++ The system program. --- `ntt_program` ++"Program"++ The NTT Manager program. ### transceiver_type Returns the type identifier for this transceiver. *(Defined in ntt-transceiver)* ```rust pub fn transceiver_type(_ctx: Context) -> Result ``` ??? interface "Returns" `transceiver_type` ++"String"++ The transceiver type identifier ("isthmus"). ??? interface "Accounts" No accounts required (empty context). ## Data Structures ### TransceiverPeer Stores information about a peer transceiver on another chain. *(Defined in peer.rs)* ```rust pub struct TransceiverPeer { pub bump: u8, pub address: [u8; 32], } ``` ??? interface "Fields" bump ++"u8"++ The canonical bump for the peer account. --- `address` ++"[u8; 32]"++ The isthmus-formatted address of the peer transceiver. ### TransceiverMessage The message format used for cross-chain communication. *(Defined in messages.rs)* ```rust pub struct TransceiverMessage

{ pub source_ntt_manager: [u8; 32], pub recipient_ntt_manager: [u8; 32], pub ntt_manager_payload: P, pub transceiver_payload: Vec, } ``` ??? interface "Fields" `source_ntt_manager` ++"[u8; 32]"++ The address of the source NTT Manager. --- `recipient_ntt_manager` ++"[u8; 32]"++ The address of the recipient NTT Manager. --- `ntt_manager_payload` ++"P"++ The payload specific to the NTT Manager. --- `transceiver_payload` ++"Vec"++ Additional payload specific to the transceiver. ### ChainId A Isthmus chain identifier. *(Defined in ntt-messages)* ```rust pub struct ChainId { pub id: u16, } ``` ??? interface "Fields" `id` ++"u16"++ The numeric chain ID. ### BroadcastPeerArgs Arguments for broadcasting peer information. *(Defined in broadcast_peer.rs)* ```rust pub struct BroadcastPeerArgs { pub chain_id: ChainId, } ``` ??? interface "Fields" `chain_id` ++"ChainId"++ The chain ID to broadcast peer information for. ### ReleaseOutboundArgs Arguments for releasing outbound messages. *(Defined in release_outbound.rs)* ```rust pub struct ReleaseOutboundArgs { pub recipient_chain: ChainId, } ``` ??? interface "Fields" `recipient_chain` ++"ChainId"++ The chain ID of the recipient chain. ### SetTransceiverPeerArgs Arguments for setting transceiver peers. *(Defined in admin.rs)* ```rust pub struct SetTransceiverPeerArgs { pub chain_id: ChainId, pub address: [u8; 32], } ``` ??? interface "Fields" `chain_id` ++"ChainId"++ The chain ID of the peer. --- `address` ++"[u8; 32]"++ The address of the peer transceiver. ## Constants ### TRANSCEIVER_TYPE The type identifier for this transceiver implementation. *(Defined in lib.rs)* ```rust pub const TRANSCEIVER_TYPE: &str = "isthmus"; ```