APEEJAY STYA UNIVERSITY

PALWAL ROAD, SOHNA, GURUGRAM,122103

HYPERLEDGER FABRIC ARCHITECTURE

PRESENTATION
ETCA408

NAME: ANUJ
COURSE: MCA-WITH IOT & CYBER SECURITY
U.R.N: ASU2024010100062
FACULTY NAME: DR. RITIKA
What is Hyperledger Fabric

• An implementation of blockchain technology that is intended as a foundation for developing blockchain

applications for the enterprise

• Key characteristics:
– Permissioned
– Highly modular
• Pluggable consensus, ledger, membership services, endorsement and validation
– Smart contracts in general purpose languages
– Privacy
– No “mining” or native crypto-currency required for consensus
– Execute-order-validate vs order-execute

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Hyperledger Fabric V1 Architecture

External-CA Fabric-CA

optional
Membership optional
✓ ✓
Services Admin

Peer

Endorser
Client SDK
Application (HFC)
Committer

O O Ledger
A
Chaincode B

O O Events !

Ordering-Service Hyperledger Fabric Network

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 How applications interact with the ledger
Client
Blockchain develops
Application
developer
SDK
develops submits
1. Client Application in
using Hyperledger
Fabric Client (HFC)
SDK Smart emits
Contract !
2. Smart Contract event
implemented using accesses
chaincode – managing
the World state ‘get’, ‘put’, ‘delete’ recorded

Ledger
block
emits
txn txn txn
!
event
World state Blockchain
Peer
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Fabric Ledger

• The Fabric ledger is maintained by each peer and includes the blockchain and worldstate
• A separate ledger is maintained for each channel the peer joins
• Transaction read/write sets are written to the blockchain
• Channel configurations are also written to the blockchain
• The worldstate can be either LevelDB (default) or CouchDB
– LevelDB is a simple key/value store
– CouchDB is a document store that allows complex queries
• The smart contact Contract decides what is written to the worldstate

Config Config Transaction Transaction

Block Block Block Block Worldstate
0 1 2 3
Genesis
Blockchain

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Nodes and roles

Committing Peer: Maintains ledger and state. Commits transactions.

May hold smart contract(chaincode).

Endorsing Peer: Specialized peer also endorses transactions by

receiving a transaction proposal and responds by granting or denying
endorsement. Must hold smart contract.

Ordering Node: Approves the inclusion of transaction blocks into the

ledger and communicates with committing and endorsing peer nodes.
Does not hold smart contract. Does not hold ledger.

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Hyperledger Fabric Consensus

Consensus is achieved using the following transaction flow:

Endorse Order Validate