Blockchain explored

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Blockchain Explored
A Technical Deep-Dive on Hyperledger Fabric V1
Blockchain Architected
Blockchain Explored
Blockchain S...

Project Status and
Roadmap
Technical Deep Dive

3
What is Hyperledger Fabric
• Linux Foundation Hyperledger
– A collaborative effort created to advance cross-industry blo...

Hyperledger Fabric Roadmap
March 2017
V1 Alpha
• Docker images
• Tooling to bootstrap network
• Fabric CA or bring your ow...

5
Hyperledger Fabric V1 Architecture
Client
Application
SDK
(HFC)
Membership
Services
Peer
Endorser
Ledger
Committer
A
Cha...

6
Overview of Hyperledger Fabric v1 – Design Goals
• Better reflect business processes by specifying who endorses transact...

Project Status and Roadmap
Technical Deep Dive

8
Recall key blockchain concepts
Blockchain
Developer
D
Blockchain
Operator
O
Peers Consensus

Security
Systems
Integrati...

Technical Deep Dive
• [ Network Consensus ]
• Channels and Ordering Service
• Network setup
• Endorsement Policies
• Permi...

10
Nodes and roles
Committing Peer: Maintains ledger and state. Commits transactions.
May hold smart contract (chaincode)....

11
Application proposes transaction
Endorsement policy:
• “E0, E1 and E2 must sign”
• (P3, P4 are not part of the policy)
...

12
Sample transaction: Step 2/7 – Execute proposal
Endorsers Execute Proposals
E0, E1 & E2 will each execute the
proposed ...

13
Sample transaction: Step 3/7 – Proposal Response
Application receives responses
RW sets are asynchronously returned to
...

14
Sample transaction: Step 4/7 – Order Transaction
Responses submitted for ordering
Application submits responses as a
tr...

15
Hyperledger Fabric Network
Ordering-Service
Sample transaction: Step 5/7 – Deliver Transaction
Orderer delivers to comm...

16
Hyperledger Fabric Network
Ordering-Service
Sample transaction: Step 6/7 – Validate Transaction
Committing peers valida...

17
Client
Application
S
D
K
Hyperledger Fabric Network
Ordering-Service
Sample transaction: Step 7/7 – Notify Transaction
...

Technical Deep Dive
• Network Consensus
• [ Channels and Ordering Service ]
• Network setup
• Endorsement Policies
• Permi...

19
Ordering Service
The ordering service packages transactions into blocks to be delivered to
peers. Communication with th...

20
Channels
Channels provide privacy between different ledgers
– Ledgers exist in the scope of a channel
• Channels can be...

21
Single Channel Network
• Similar to v0.6 PBFT model
• All peers connect to the same
system channel (blue).
• All peers ...

22
Multi Channel Network
• Peers E0 and E3 connect to the red
channel for chaincodes Y and Z
• Peers E1 and E2 connect to ...

Technical Deep Dive
• Network Consensus
• Channels and Ordering Service
• [ Network setup ]
• Endorsement Policies
• Permi...

24
Bootstrap Network (1/6) - Configure & Start Ordering Service
Hyperledger Fabric Network
Ordering-Service
An Ordering Se...

25
Hyperledger Fabric Network
Bootstrap Network (2/6) - Configure and Start Peer Nodes
E0
E1
E2
E3
A peer is configured an...

26
Hyperledger Fabric Network
E0
E1
E2
E3
Bootstrap Network (3/6) - Install Chaincode
A
BA
B
A
B
Chaincode is installed on...

27
Hyperledger Fabric Network
E0
E1
E2
E3
A
BA
B
Bootstrap Network (4/6) – Create Channels
A
B
Channels are created on the...

28
Ordering-Service
O
O O
O
Hyperledger Fabric Network
E0
E1
E2
E3
A
B
A
B
A
B
Bootstrap Network (5/6) – Join Channels
Pee...

29
Ordering-Service
O
O O
O
Bootstrap Network (6/6) – Instantiate Chaincode
Hyperledger Fabric Network
E0
E1
E2
E3
A
B
A
B...

Technical Deep Dive
• Network Consensus
• Channels and Ordering Service
• Network setup
• [ Endorsement Policies ]
• Permi...

31
Endorsement Policies
An endorsement policy describes the conditions by which a transaction can be
endorsed. A transacti...

32
Endorsement Policy Syntax
Policy Syntax: EXPR(E[, E...])
Where EXPR is either AND or OR and E is either a principal or ...

33
Endorsement Policy Examples
Examples of policies:
• Request 1 signature from all three principals
– AND('Org1.member', ...

Technical Deep Dive
• Network Consensus
• Channels and Ordering Service
• Network setup
• Endorsement Policies
• [ Permiss...

35
- Enroll
- Request Ecert
Hyperledger Fabric
Blockchain
User A
uses
Ecert
invokes SC txn
(signed with Ecert)
Enrollment ...

36
Transaction and Identity Privacy
• Enrollment Certificates, Ecerts
– Long term identity
– Can be obtained offline, brin...

37
Membership Services Provider API
Membership Services Provider API
• Pluggable interface supporting a range of
credentia...

39
Membership Services Provider (MSP)
• An abstraction to represent a membership authority and its operations on issuing a...

41
Ecert
Fabric-CA Details
Fabric-CA
cluster DB
LDAP
Authenticate
Enroll ID, secret
HSM
Root
Certificate Authority
Fabric-...

42
Fabric-CA
Certificate Authority
• Issues Ecerts and manages renewal and revocation
• Supports:
– Clustering for HA char...

43
Blockchain
User
New User Registration and Enrollment
U
3. Enroll(Enroll ID, secret)
wallet
Registration and Enrollment
...

44
World state
Blockchain
block
…
Application Level Encryption
Ledger
Encrypt tx input
Client
Application
SDK
Chaincode
De...

Technical Deep Dive
• Network Consensus
• Channels and Ordering Service
• Network setup
• Endorsement Policies
• Permissio...

46
WorldState Database
• Pluggable worldstate database
• Default embedded key/value implementation using LevelDB
– Support...

47
Summary and Next Steps
• Apply shared ledgers and smart contracts to your Business Network
• Think about your participa...

Thank you
www.ibm.com/blockchain
developer.ibm.com/blockchain
www.hyperledger.org
© Copyright IBM Corporation 2017. All ri...

Blockchain explored

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