Node Architecture

The Switchboard network distributes data processing across various node types, each with specific responsibilities. Understanding these node types is essential for grasping how data requests are handled and secured within the Switchboard architecture. The following table details each node type and its key functions:

Node Type	Role/Function	Key Features/Responsibilities
Guardian	Gatekeeper of Data Integrity	Verifies Oracle code integrity, Bridges blockchains and SGX, Initiates SGX verification, Strict approval process
Oracle	Decentralised Access — Acts as a web API for public access	Segregated internal components for security and efficiency
Oracle Router — Frontend	Traffic Controller-Mitigation of DoS threats — Protects the internal environment from Denial of Service (DoS) attacks	Front-end traffic control
Oracle Router — Gateway	Task Distributor — Assigned tasks efficiently across workers	Calculates the best way to assign different tasks with different parameters
Oracle Worker	Task Executioner — Runs code for data retrieval and signing	Executes tasks assigned to worker

Guardian and Oracle Onboarding

Guardians play a crucial role in the Switchboard network by verifying that oracles and other guardians are running the correct software images. This verification process involves checking their Trusted Execution Environment (TEE) attestations. Once approved, guardians can proceed through the guardian attestation process and act as validators for the network.

Step 1: Initial Onboarding as Root of SGX Attestation.

Guardians are first and foremost onboarded into the network as the root validators of SGX attestations. This inaugural step is necessary to establish their pivotal role as the secure bridge between TEE attestation practices and the blockchain itself.

Here is a visual representation of the entire process:

Following successful verification, a minimum of one-third of all guardians are required to attest to the SGX quotes of each oracle. This ensures robust validation and security across the Switchboard network.

Oracle Onboarding

Before any attestation can occur, all oracle nodes must first successfully navigate a pre-approval process. Only then can they formally seek guardian approval. Once an oracle has been both approved and verified that the correct software image is running, said entity gains the ability to join the Oracle Queue.

Step 2: Guardian Attestation and Addition to Oracle Queue The diagram below shows the Guardian attesting to the oracle's SGX quote and, upon successful verification, adding the oracle to the Oracle Queue.

Important Keypair Verification Note: Similar to oracles, guardians must also undergo a keypair verification process, ensuring that All secp256k1 keypairs are considered valid for a period of seven days, after which they must undergo a re-verification.

Following the successful completion of the onboarding procedures for both guardians and oracles, users can then commence the process of requesting price signatures to be used on-chain.

The Lifespan of a Data Feed Request

Once onboarded, Users have the flexibility to define their custom data feeds and solicit updates from oracle nodes within the network. This process ensures that the data returned to the user includes essential data feed outputs, and any signatures required to validate data updates on-chain.

Step 3: User Request and On-Chain Posting

The user requests data from a specified feed through the gateway. In response, the user receives a signature-set. The user then posts this signature-set on-chain to update the data.

Illustrated below, users can request up-to-date data from a specified feed through the gateway. Following a response, the user receives a signature set, which is then posted on-chain to update the data.