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This section is written for reviewers, judges, and builders who want to understand how Depth is implemented.
The choices below are made to keep the ceremony close to the hardware and the data close to the people who generate it. Nothing here is novel for its own sake. Each layer exists because it earns its place in the ceremony.
LAYER
CHOICE
Frontend
SvelteKit
NFC library
libhalo + WebNFC fallback
Backend
Hono (TypeScript)
Database
SQLite via better-sqlite3
On-chain
Base Mainnet with ERC-8004 for identity and bonds
ENS
ethers.js ENS resolver
Auth
Chip signature verification only