Tangle Anonymous LLM Inference Blueprint: Combining Privacy Protection and Pay-as-You-Go

vllm-inference-blueprint is a Blueprint project on the Tangle network that combines the high-performance vLLM inference engine with the Shielded Credits privacy payment system to provide anonymous LLM inference services. It supports dual-path payments (on-chain tasks and x402 HTTP) and OpenAI-compatible interfaces, achieving a balance between user privacy protection and operators' business sustainability.

Tangle is a decentralized service network that allows developers to create and deploy Blueprint service templates (defining service behaviors, payment logic, etc.). Operators run nodes based on these templates to earn revenue. The Blueprint SDK provides infrastructure for service registration/discovery, task distribution/verification, payment settlement, etc. This project encapsulates LLM inference services based on this framework.

Core Architecture

• Operator Node (Rust): Manages vLLM subprocesses to provide inference capabilities, handles HTTP requests, and integrates the SpendAuth billing system.
• Smart Contract (Solidity): The InferenceBSM contract is responsible for GPU resource verification, model pricing management, and Shielded Credits settlement (including 24 tests).
• Client SDK (TypeScript): OpenAI-compatible API that automatically handles payment signatures and has type-safe definitions.

Dual-Path Payment

• On-chain Jobs: Records requests/results on-chain, supports verification and arbitration, suitable for high-verifiability scenarios.
• x402 HTTP Payment: Based on HTTP 402 status code, enables low-latency real-time interaction, with anonymous payments via the Shielded Payment Gateway. Users can flexibly choose the path.

The project integrates Tangle's Shielded Payment Gateway to implement anonymous payments:

1. Asset Shielding: Users transfer public tokens into the shielding pool to obtain Shielded Credits;
2. Zero-Knowledge Proof: Uses zero-knowledge proof to verify balance during payment without exposing identity;
3. Operator Receipt: Receives payments from the shielding pool while maintaining privacy. Guarantees: User identity is decoupled from requests, payment amounts/usage patterns are not public, and operators' revenue is protected.

Deployment Steps (Operators)

1. Prepare a GPU server and install vLLM;
2. Configure the Blueprint SDK and register to the Tangle network;
3. Set up the Shielded Payment Gateway connection;
4. Select a model and configure pricing (supports single-model deployment).

User Usage

Call via SDK or standard HTTP interface; the SDK automatically handles payment voucher generation and signing.

Application Scenarios

• Privacy-sensitive enterprises (medical/finance);
• Decentralized AI markets;
• Censorship-resistant content generation;
• Cross-border AI services (bypassing traditional payment restrictions).

vllm-inference-blueprint combines mature AI inference technology with blockchain privacy payment capabilities, exploring a sustainable business model for AI services under privacy protection. As privacy awareness increases and decentralized infrastructure matures, such architectures combining privacy computing and AI services may become an important trend in the future.