https://am.is Access your digital assets with ease and confidence. AMIS Digital Asset Custody Service operates at institutional-grade security levels. Our advanced protocols and cryptographic systems ensure that your assets remain securely under your control.

1. Wallet Service
AMIS WS 如何提供便捷安全的錢包服務
07/15/2020

2. Wallet Service
AMIS WS 如何提供便捷安全的錢包服務
07/15/2020

3. About AMIS
Fintech Regulatory
Sandbox
Blockchain &
Research
Wallet Service

4. Fintech Regulatory Sandbox

5. Blockchain & Research

6. About Me
AMIS
MaiCoin
HTC
Wyse / Dell
Noodle Labs / TunesAccess
Oracle
Stanford
NCCU

7. 一句話描述 Wallet Service
提供高可用性 API 且安全的數位資產錢包服務
(Secure cloud digital asset wallet service with highly available API)

8. 一張圖描述 Wallet Service
Node Cluster Key Storage
+

9. 一張圖總結 Wallet Service
Reliable
developer API
Professional &
economical
node operation
Wallet security

10. Case Study: OMNI USDT 假入金security
https://www.coinness.com/news/582082
● 常見手法：駭客利用真的交易，假的內容騙收款者或是交易所收到
款項。
● OMNI 常見手法：使用非 USDT Property ID

11. 全都是 Tether US

12. USDA
USDB
USDC
USDE
USDS
USDT

13. 31 才是通用的
USDT

14. Case Study: Geth RPC 誤用security
● Geth：以太坊官方節點，提供節點及錢包功能。
● Geth RPC：Geth 提供給程式操作的接口。

15. Case Study: Geth RPC 誤用security

16. Case Study: Geth RPC 誤用security
● 搭配服用：
1. Geth RPC 沒鎖內網
2. 使用預設連接埠 8545
3. 接受任意來源 IP
4. 使用 unlockAccount，就算只 unlock 1s

17. Key Generation & Encryption
AMIS Service Service Cluster Storage Cluster
1.new_address 2.gen encryption key
Recursive multi-layered
distributed key
3.distributed key
encryption
4.distributed secure storage
security

18. Client Protection
App Service AMIS Service
Dual certification
Multi-factor
authentication
IP whitelisting
End 2 end encryption
Key rotation
Policies
security

19. Case Study: Gas Price 急速飆升Operation

20. Case Study: Gas Price 急速飆升Operation

21. Case Study: Gas Price 急速飆升Operation
https://ethgasstation.info/

22. Case Study: Gas Price 急速飆升Operation
AMIS Gas Price Prediction (GPP)
200 Gwei
P95

23. Case Study: Gas Price 急速飆升Operation
AMIS Transaction Watcher
89
86 ~ 103

24. Case Study: 雲端服務帳號／資料無預警遺失Operation

25. Case Study: 雲端服務帳號／資料無預警遺失Operation
● AWS 在 2017年就因為一位開發人員的失誤而造成了大規模的服
務中斷。
● Azure 在2018年則是因為天災而造成硬體裝置損毀。
● GCP 在2019年則是發生了近三年最大規模的當機。

26. Cross Cloud BackupOperation

27. Professional & Economical OperationOperation
Kubernetes
Powered Cluster
Smart Node
Management
Cross Cloud
Backup

28. Reliable Developer APIAPI
Scalable
Explorer API
Webhooks &
Alerts
Customizable
API

29. 一張圖總結 Wallet Service
Reliable
developer API
Professional &
economical
node operation
Wallet security

31. Digital Signature

32. Signature Generation & Verification

33. Moving Toward Decentralization - Multisignature
Wikipedia: Multisignature (multi-signature) is a digital signature
scheme which allows a group of users to sign a single document.

34. Bitcoin Multisig
● 原生 Multi-signature
1. Locking script: M <Public Key 1> <Public Key 2> ... <Public
Key N> N OP_CHECKMULTISIG
2. Unlocking script: OP_0 <Signature 1> <Signature 2> …
<Signature M>
● 或用 P2SH（較常見）
1. Redeem script + Locking script: <2 PK1 PK2 PK3 PK4 PK5 5
OP_CHECKMULTISIG> OP_HASH160 <redeem scriptHash>
OP_EQUAL
2. Unlocking script: <Sig1> <Sig2> 2 PK1 PK2 PK3 PK4 PK5 5
OP_CHECKMULTISIG

35. Ethereum Multisig
https://github.com/gnosis/MultiSigWallet

36. Ethereum Multisig

37. Ethereum Multisig

38. Ethereum Multisig

39. Keyless Wallet: Threshold Signature
MPC for signature
generation
Private key never exposed!

40. Keyless Wallet: Threshold Signature

41. @getamis/alice

42. Hierarchical Threshold Signature
Regular shares
High level shares

43. Hierarchical Threshold Signature

44. HTSS Use Case: 數位資產銀行保管箱
圖片來源：永豐銀行

45. HTSS Use Case: Multisig Mobile Wallet
AMIS Service
Users
MPC for signature
generation
App Service

46. https://am.is