David (CTO) walks you through what makes Cos72 different — secure, effortless, and out of your way. David（CTO）带你看 Cos72 的不同之处 —— 安全、省心、不挡路。
Passkey/biometric login + BLS-verified transactions, with amount-based tiers — small needs only your passkey, larger adds a DVT co-signature, large adds a guardian. A daily Guard caps spending. Keys live in KMS/TEE.Passkey/生物识别登录 + BLS 校验交易，按金额分层 —— 小额只需 passkey，更大加 DVT 协签，大额再加 guardian。每日 Guard 限额封顶。密钥存于 KMS/TEE。
Sign up with email + Face ID; no password to invent, no seed phrase to back up. WebAuthn/P-256 credentials replace the things people lose.邮箱 + Face ID 注册；不用编密码、不用抄助记词。WebAuthn/P-256 凭证取代了那些容易丢的东西。
SuperPaymaster sponsors gas (USDC via EIP-3009 + a relay). You can transact with zero ETH in your wallet — the #1 newbie blocker, gone.SuperPaymaster 代付 gas（USDC 走 EIP-3009 + relay）。钱包里 0 ETH 也能交易 —— 新手最大的拦路虎被搬走。
Your address is counterfactual (deploys on first use) and network details stay hidden. It feels like a normal Web2 app — the blockchain stays out of your way.地址是反事实的（首次使用才部署），网络细节被隐藏。用起来就像普通 Web2 应用 —— 区块链不挡你的路。
2-of-3 guardians (including a default community guardian) can restore your account if you lose a device. The community guardian is only 1 of 3 — it can help, never harm.2-of-3 守护人（含默认社区守护人）在你丢设备时帮你找回账户。社区守护人只占 3 之 1 —— 只能帮你、不能害你。
Fully open-source and provider-portable. Use the hosted version or self-deploy; no vendor lock-in. Your data, identity and assets stay yours.完全开源、provider 可替换。用托管版或自部署;无厂商锁定。数据、身份、资产都归你。
Community points (xPNTs), non-transferable reputation SBTs, ticketed membership, and gas sponsorship for members — the pieces a community needs, built in.社区积分（xPNTs）、不可转让声誉 SBT、门票制成员、为成员代付 gas —— 社区需要的零件,开箱即用。
Modular primitives behind stable contracts: swap runtime/sandbox providers (E2B, veFaaS, local), and addresses come from one SDK canonical source across chains.稳定契约后的可组合原语：runtime/sandbox provider 可替换（E2B、veFaaS、本地），地址跨链统一取自 SDK 单一事实源。