Architecture Overview

UTS implements a dual-layer timestamping architecture.

High-Level Flow

User → Calendar Server → Merkle Tree → EAS Attestation → Blockchain

Components

Calendar Server

HTTP server that:

• Accepts digest submissions
• Batches digests into Merkle trees
• Returns timestamp proofs

Stamper

Batching engine that:

• Builds Merkle trees from pending digests
• Submits attestations via EAS
• Manages calendar state

Relayer

Cross-chain service that:

• Anchors L2 roots to L1
• Bridges attestation proofs back to L2

Dual-Layer Architecture

L2 Direct Path (Fast)

1. User submits digest to calendar
2. Stamper batches into Merkle tree
3. Root attested on L2 via EAS (Scroll)
4. User receives proof in seconds

L1 Anchoring Path (Secure)

1. L2 attestation roots collected
2. Batched into L1 Merkle tree
3. Anchored on Ethereum mainnet
4. Provides maximum security

Data Flow

┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│    User     │────▶│  Calendar   │────▶│   Stamper   │
└─────────────┘     └─────────────┘     └─────────────┘
                                               │
                                               ▼
                                        ┌─────────────┐
                                        │     EAS     │
                                        └─────────────┘
                                               │
                          ┌────────────────────┴────────────────────┐
                          ▼                                         ▼
                   ┌─────────────┐                          ┌─────────────┐
                   │  L2 (Scroll)│                          │  L1 Relayer │
                   └─────────────┘                          └─────────────┘
                                                                   │
                                                                   ▼
                                                            ┌─────────────┐
                                                            │  Ethereum   │
                                                            └─────────────┘

Learn More

For detailed implementation, see the Reference Book:

• System Architecture
• Calendar Pipeline
• L1 Anchoring