A brief compare and contrast of why you may want to choose Hyperledger Fabric for your first foray into the world of building blockchain apps. If you are interested in how to deploy your first Hello World chaincode, please visit the slides below for a step-by-step guide. http://www.slideshare.net/Excelian/excelian-hyperledger-walkthroughfeb17 These slides were created by James Bowkett, Principal Consultant at Excelian.

1. 1
Hyperledger
Fabric

2. Hyperledger Fabric – What is it?
2
 Originally developed by IBM/DAH and donated to Linux
foundation
 More of a framework with default implementations
 Smart contracts are known as chaincode invoked
through Protobuf
 Chaincode runs inside a Docker container as its
sandbox
 Provides table-like storage using RocksDB
 (RocksDB is by Facebook and originally forked from
LevelDB by Google, so its scalability is okay ;-)
 Implemented in anything that can be run through the
chaincode compiler
 currently, Go and Java
 We will be using v0.6

3. Architecture
 Fabric has several framework
components:
 Membership services for security:
audit, registration & identity
management
 Blockchain services: Consensus,
Storage & transactions
 Chaincode services: Secure
container & registry
 For the hackathon we will focus on
the container and blockchain
storage
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Chaincode
REST ENDPOINTS
Hyperledger-java
API
Application code
ValidatingPeerNode
Dockercontainer RocksDB storage
Other
Validating
PeersREST
Consensus
Consensus
Consensus

4. Fabric Vs Ethereum – Key Differences
Storage Model RocksDB allows for a table of data with
primary key lookup
(think Excel, not Sybase!)
Data structures (maps, lists etc) held in
smart contracts
Sandbox/
execution
Java or Golang turned into chaincode for
remote execution in Docker containers of
validating peer nodes
Ethereum Virtual machine and Solidity
smart contracts
Permissions
Model
Roles/groups and digital signatures of
accounts that are enrolled into the
membership services
Application-specific, no permissions model
as-yet
Consensus
Mechanism
Consensus can be ignored, or batch PBFT Usually Ethash/Proof of Work
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5. Fabric - The Pros & Cons
✔ Any and all Java development tooling is
available
✔ The Docker paradigm is familiar
✔ Learning curve is quite shallow
✔ Often in blockchain prototypes, all we want
is immutable storage
✔ No restrictions on what can be
implemented
✔ Not tied to a currency
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❌ Platform is still maturing
❌ Deployment experience is a bit fiddly
(especially when compared to Ethereum),
nothing you can’t surmount though
❌ Debugging through Docker containers can
also be painful

6. “So, should I choose Fabric?”
Fabric is a good choice, if:
✔ Your main development language is Java/Golang
✔ All you want/need is immutable storage
✔ Your project is more of a consortium/permissioned design
✔ Your prototype is largely throwaway
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7. Next steps
 A step-by-step guide to deploying your first Hello World chaincode onto Hyperledger
Fabric click on the link below:
 http://www.slideshare.net/Excelian/excelian-hyperledger-walkthroughfeb17
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8. Thank you
www.excelian.com