How does a Blockchain work in Hyperledger composer and fabric? Also, I know that are no Miners in Hyperledger, then how does it work without mining in a Blockchain? Also, how do Smart Contracts operate on a Hyperledger platform?
Hyperledger Composer simplifies application development on top of the Hyperledger Fabric Blockchain infrastructure.
Hyperledger is a permissioned blockchain. Mining is primarily the domain of public Blockchains, not Permissioned Blockchains.
The javacript transaction processors and business logic are a constituent part of the Composer business network (ie smart contract) that is deployed to the Blockchain network.
I would suggest you to read the following documents for a better understanding:
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This will solve your problem
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