# Hyperledger Fabric HLF * The Linux Foundation founded the Hyperledger project in Y2015 to advance **cross-industry** blockchain technologies. * HLF is one of the Framework from *"HL Framework & Tools ecosystem"* with the primary objective to provide **Permissioned with Channel Support**. i.e., HLF is one of the blockchain projects within Hyperledger. * Like other blockchain technologies (Etherum), it also has * a ledger, * uses smart contracts, * participants manage their transactions, * Data Provenance\* by offering *immutable and cryptographically verifiable record of transactions* * Unlike other Blockchain technologies (Ethereum), it differs as * **private and permissioned**, * **No open permissionless system**, * **No unpermissioned entry** to any member/*unknown identities* to participate in the network, * **No PoW** ( “proof of work” protocol to validate transactions and secure the network), * **Membership Service Provider (MSP)**: Restricted Entry to Members of a Hyperledger Fabric network enroll through a trusted MSP. ### Overview of Hyperledger Framework and Tools Broader ecosystem of *HL Framework & Tools:* ![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1627311977415/bzbHBYPAgh.png align="left") ### Key Concpets of Hyperledger FABRIC ##### Blockchain network A blockchain network is a technical infrastructure that provides ledger and smart contract (chaincode) services to applications ##### Block and Chain A block contains an ordered set of transactions. It is cryptographically linked to the preceding block, and in turn it is linked to be subsequent blocks. The ledger’s chain is a transaction log structured as hash-linked blocks of transactions. Suuch as, Blockchain B contains blocks 0, 1, 2. ##### Smart Contract A smart contract is code (invoked by a client application external to the blockchain network) that manages access and modifications to a set of *key-value pairs* in the *World State* via Transaction. ##### Chain Code In Hyperledger Fabric, smart contracts are packaged as chaincode. Chaincode is installed on peers and then defined and used on one or more channels. ##### World State *World state* maintains “current state” of transaction in Ledger, and such data is stored in a state database for efficient reads and queries from chaincode. Supported databases include - *couchDB*. ##### Channel A channel is a private blockchain *overlay* which allows for data isolation and confidentiality. A channel-specific ledger is shared across the peers in the channel, and transacting parties must be authenticated to a channel in order to interact with it. Channels are defined by a *Configuration-Block*. ##### Membership Service Provider MSP refers to an abstract component of the system that provides credentials to clients, and peers for them to participate in HLF. ##### Ordering Service Also known as orderer. A defined collective of nodes that orders transactions into a block and then distributes blocks to connected peers for validation and commit. The ordering service exists independent of the peer processes and orders transactions on a first-come-first-serve basis for all channels on the network. --- HLF also leverages *Gossip Protocol* & *Raft Algo* for following 3 major functions: - 1) manages peer discovery and channel membership; - 2) disseminates ledger data across all peers on the channel; - 3) syncs ledger state across all peers on the channel The same *protocol* and *Algo* is used in **Progrium Consul** (a distributed computing CONSENSUS Algo for Leader election and worker management), and it is applied in Seneca (a Microservice Framework on Nodejs) --- ### Hyperledger FABRIC, Hyperledger COMPOSER, Hyperledger EXPLORER **Hyperledger FABRIC:** ```plaintext - A very popular Blockchain Network from Hyperledger ecosystem. - Whereas other Blockchain Network from Hyperledger ecosystem, such as Hyperledger SAWTOOTH is the 2nd popular network. ``` **Hyperledger EXPLORER:** ```plaintext User-friendly Web application tool from Hyperledger ecosystem to used to - view, invoke, deploy or query - blocks, - transactions and associated data, - network information (name, status, list of nodes), - chain codes and transaction families, - as well as any other relevant information stored in the ledger. ``` Reference: [Official Link](https://www.hyperledger.org/use/explorer) Reference: [Video Demo](https://www.youtube.com/watch?v=mI6-qRagn_Q) **Hyperledger COMPOSER:** ```plaintext The Hyperledger Composer Playground provides a user interface for the - configuration, deployment and testing of a business network. - Advanced Playground features permit users to manage - the security of the business network, - invite participants to business networks and - connect to multiple blockchain business networks. ``` Reference: [Official Link](https://hyperledger.github.io/composer/latest/playground/playground-index) Reference: [Video Demo](https://www.youtube.com/watch?v=gAxK6zYrfxI) ### DOCKER Hyperledger FABRIC Hyperledger EXPLORER * [Fabric baseimage from hyperledger](https://github.com/hyperledger/fabric-baseimage) * [Official reference](https://hyperledger-fabric.readthedocs.io/en/release-2.0/install.html) ---

Hyperledger EXPLORER Official Link of Hyperledger Explorer

Hyperledger COMPOSER Official Link of Hyperledger Composer

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