Toshimasa Nasu LINE / Blockchain Lab While the LINE Token Economy concept and white paper was published in late August 2018, technical details and future architectural plans were not. This session focuses on key topics surrounding LINE's blockchain technology, including LINE's decision to expand services utilizing blockchain technology, reasons behind LINE to develop/launch its own blockchain platform, current issues and how LINE is working to solve them, LINE Token Economy infrastructure for creating blocks, and architecture for Smart Contracts execution platform.

2. • Get Benefit • Get Benefit
User Service Shareholder
• Get Benefit?
FIRST QUESTION?

3. Cash/Point UserService
SECOND QUESTION?

4. Cash/Point UserService
THIRD QUESTION?
System ≠ Benefits?

5. TODAY
32,834,324,740 point
(2017/09 - 2018/08)

6. TODAY

7. TRANSPARENCY AND SAFETY
More Fun !
Service User
Transparency and Safety

8. FUTURE
Blockchain

9. BACK TO TODAY

10. TECHNOLOGY OF BLOCKCHAIN

11. User ExchangeService
FUTURE WITH BLOCKCHAIN
Point/CashPoint

13. USER BOTTLENECKS
Private Key DiscoveryWallet

14. DEVELOPER BOTTLENECKS
Safety Scalability
Blockchain
Technology

15. Service-Oriented Blockchain Platform
LINK Network
LINK Framework
dApps
LINK Chain
= Service

16. Service dApps
DECENTRALIZED APPLICATIONS

17. LINK Network
LINK Framework
dApps
Service-Oriented Blockchain Platform
= Service
LINK Chain

18. - Consensus Algorithm
- Scalable architecture
LINK Network

19. CONSENSUS ALGORITHM

20. SCALABILITY

21. LINK Network
LINK Framework
dApps
Service-Oriented Blockchain Platform
= Service
= Blockchain
LINK Chain

22. LINK Framework
- Auto-create wallet at sign-in
- Secure private keys
- Available APIs

23. - LINE open platform
- Smart contract templates
dApps

24. SMART CONTRACT
LINK Point on Smart Contract

25. LINK Network
LINK Framework
dApps
Service-Oriented Blockchain Platform
= Service
= API
= Blockchain
LINK Chain

26. LINE OFFERS A
SERVICE-ORIENTED
BLOCKCHAIN PLATFORM

27. LINK Chain
LINK Network
LINK Framework
C-Node
C-Node
C-Node
Leader
C-Node
S-Node
S-Node
C-Node
C-Node
C-Node
C-Node
C-Node
C-Node
S-Node
S-Node
LINK SCAN UI LINK Admin/TDK UI
LINK API Module
LINK Block Data Module
LINK Relayer Module
LINK Connect Module
LINK Front API Module
LINK Wallet Module
LINK Query Module

28. Wizball 4CAST

29. LINK Network
Consumer
LINK SCAN
HBase
LINK SCAN
Front
Watcher
Prometheus
IMON
Logger
filebeat
Logger
logstash
LINK SCAN
Front
Internet
L7 (DNS)
LINK SCAN
Radis
C-Node
C-Node
C-Node
Leader
C-Node
L7 (DNS) L7 (DNS)
S-Node
S-Node
C-Node
C-Node
C-Node
C-Node
C-Node
C-Node
S-Node
S-Node
LINK Network
Watcher
Grafana
Producer Kafka

30. LINK SCAN
https://scan.link.network/contracts

31. LINK Network
Consumer
LINK SCAN
HBase
LINK SCAN
Front
Watcher
Prometheus
IMON
Logger
filebeat
Logger
logstash
LINK SCAN
Front
Internet
L7 (DNS)
LINK SCAN
Radis
C-Node
C-Node
C-Node
Leader
C-Node
L7 (DNS) L7 (DNS)
S-Node
S-Node
C-Node
C-Node
C-Node
C-Node
C-Node
C-Node
S-Node
S-Node
LINK Network
Watcher
Grafana
Producer Kafka

32. C-Node:
Consensus-Node
● Nodes that run on the
consensus algorithm for
generating and validating
blocks
C-Node
C-Node
C-Node
Leader
C-Node
L7 (DNS) L7 (DNS)
S-Node
S-Node
C-Node
C-Node
C-Node
C-Node
C-Node
C-Node
S-Node
S-Node

33. S-Node:
Sync-Node
● Read-only nodes that are fully
synced with C-Nodes to
provide stable data query to
the service
C-Node
C-Node
C-Node
Leader
C-Node
L7 (DNS) L7 (DNS)
S-Node
S-Node
C-Node
C-Node
C-Node
C-Node
C-Node
C-Node
S-Node
S-Node

34. Fast Finality
PBFT CONSENSUS ALGORITHM
Request Pre Prepare Prepare Commit Reply
Client
Leader
Replica
Replica
Replica

35. Request
PBFT
Request Pre Prepare Prepare Commit Reply
Client
Leader
Replica
Replica
Replica

36. Pre Prepare
PBFT
Request Pre Prepare Prepare Commit Reply
Client
Leader
Replica
Replica
Replica

37. Prepare
PBFT
Request Pre Prepare Prepare Commit Reply
Client
Leader
Replica
Replica
Replica

38. Commit
PBFT
Request Pre Prepare Prepare Commit Reply
Client
Leader
Replica
Replica
Replica

39. Reply
PBFT
Request Pre Prepare Prepare Commit Reply
Client
Leader
Replica
Replica
Replica

40. Smart Contract on LINK Network
LINK Contract
LINK Contract A
Owner
Wallet
LINK Contract
Update
Check
Whitelist

41. Inside C-Node
FLEXIBLE ARCHITECTURE
Channel
LINK Core LINK Service
Peer Manager
Block Manager
Network Interface Message Queue
Client Interface
(REST, jsonRPC)
Outer service
(gRPC, jsonRPC)
Inner service
(Message Queue)
Consensus Manager
Broadcast Manager
Base Coin Manager
LINK Contract Manager
Governance Manager
STEP Manager

42. Inside Channel
MODULAR NODE ARCHITECTURE
LINK Core LINK Service
Peer Manager
Block Manager
Consensus Manager
Broadcast Manager
Base Coin Manager
LINK Contract Manager
Governance Manager
STEP Manager

43. Whitelist management
LINK Contract
TX
Whitelist
Request Pre
Prepare
Prepare Commit Reply
Client
Leader
Replica
Replica
Replica
LINK Service
Base Coin Manager
LINK Contract Manager
Governance Manager
STEP Manager

44. 5
4
3
2
1
Unzip & Load
Validate
4 & 5 TX
with Contract
Deploy
TX
Contract.zip
Temporary
LINK
Contract
List
Contract
Block & Transactions
Request Pre
Prepare
Prepare Commit Reply
Client
Leader
Replica
Replica
Replica
LINK Contract

45. 5
4
3
2
1
Deploy Finality
TX
Contract.zip
Temporary
LINK
Contract
List
Confirmed
LINK
Contract
List
Contract
Block & Transactions
ContractRequest Pre
Prepare
Prepare Commit Reply
Client
Leader
Replica
Replica
Replica
LINK Contract

46. 5
4
3
2
1
Update
TX
New Contract.zip
Temporary
LINK
Contract
List
New Contract
Confirmed
LINK
Contract
List
Contract
Block & Transactions
Request Pre
Prepare
Prepare Commit Reply
Client
Leader
Replica
Replica
Replica
LINK Contract

47. 5
4
3
2
1
Update Finality
TX
New Contract.zip
Confirmed
LINK
Contract
List
Confirmed
LINK
Contract
List
New Contract
Block & Transactions
ContractRequest Pre
Prepare
Prepare Commit Reply
Client
Leader
Replica
Replica
Replica
LINK Contract

48. LINK Framework
LINK Framework
LINK SCAN UI LINK Admin/TDK UI
LINK API Module
LINK Block Data Module
LINK Relayer Module
LINK Connect Module
LINK Front API Module
LINK Wallet Module
LINK Query Module

49. LINK Framework
HOW TO USE
LINK
Frame
work
1. Create Account
Admin Admin Wallet
1.1 Create Wallet

50. LINK Framework
HOW TO USE
LINK
Frame
work
Admin Admin Wallet
dApp dApp Smart
Contract
2.1. Mint
2.2. Add Whitelist
2.Register dApp

51. LINK Framework
HOW TO USE
LINK
Frame
work
Admin Admin Wallet
dApp dApp Smart
Contract
Operator Operator Wallet
3.1. Create Wallet
3.2. Add Whitelist3.Add Operator

52. LINK Framework
HOW TO USE
LINK
Frame
work
Admin Admin Wallet
dApp dApp Smart
Contract
Operator Operator Wallet
User
4. LINE Login
User Wallet
4.1 Create Wallet

53. LINK Framework
HOW TO USE
LINK
Frame
work
Admin Admin Wallet
dApp dApp Smart
Contract
Operator Operator Wallet
User User Wallet
5. Transfer 5.2. Call
5.1. Check whitelist
5.3. Transfer

54. LINK Network
LINK Framework
HOW TO USE
LINK
Frame
work
Admin Admin Wallet
dApp dApp Smart
Contract
Operator Operator Wallet
User User Wallet
LINK Scan UI

55. LINE OFFERS A
SERVICE-ORIENTED
BLOCKCHAIN PLATFORM

56. PAST ACHIEVEMENTS
LINK Chain
2018.09

57. AND FUTURE MILESTONES
LINEAR
NETWORK
PARTNER
dApp
OPEN dAppLINK Chain
2018.09 2018.12 2019.1Q 2019.2Q

58. Leaf-chain
Root-chain
Leaf-chain Leaf-chain Leaf-chain Leaf-chain
LINEAR NETWORK

59. PARTNER / OPEN dApps
LINK Framework
dApp
Easy & Secure
dApp dApp
Functional Own Chain

60. ?
PUBLIC BLOCKCHAIN

61. CLOSING
THE DISTANCE
USER

62. CLOSING
THE DISTANCE
PARTNER

63. THANK YOU