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Blockchain (Hyperledger (Linux Foundation (Big data and analytics: ODPi, R…

- - - - Kafka + Structured Streaming
        
        Apache Kafka Tutorial
        
        Apache Kafka is an open-source stream-processing software platform developed by the Apache Software Foundation, written in Scala and Java. The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds.
  - - - Default: LevelDB
        
        the default key/value state database for Hyperledger Fabric, and simply stores key/value pairs.
      - Substitution: CouchDB
        
        an alternative to LevelDB. Unlike LevelDB, CouchDB stores JSON objects. CouchDB is unique in that it supports keyed, composite, key range, and full data-rich queries.
  - - - application, peer, endorser, and orderer identities, and verifies these credentials. A signature is generated through the use of a Signing Algorithm and a Signature Verification Algorithm.
      - Verifying: Application; Peer; Endorser; Other Identities
      - Gen signature (Signing Algorithm and Signature Verification Algorithm)
    - - Fabric CA Git Folder
  - - - https://hyperledger-fabric.readthedocs.io/en/release-1.1/samples.html
      - https://stackoverflow.com/questions/45033956/how-do-i-resolve-the-error-on-hyperledger-fabric
      - Sol
        
        $ curl -sSL https://goo.gl/6wtTN5 | bash -s 1.1.0
        $ export PATH=$PWD/bin:$PATH
        // cd into the ./bin directory
        make cryptogen configtxgen peer orderer peer-docker orderer-docker tools-docker
    - - Issuing in Name Conflict: The container already exist
        
        Question: How to rename or use different containers in HLF?
        
        Error:
        ERROR: for orderer.example.com Cannot create container for service orderer.example.com: b'Conflict. The container name "/orderer.example.com" is already in use by container "8acb9c09f93f28cd14f08caf198ea49c839096bcd2b01d969570f8b72cce6771". You have to remove (or rename) that container to be able to reuse that name.'
        ERROR: for peer0.org1.example.com Cannot create container for service peer0.org1.example.com: b'Conflict. The container name "/peer0.org1.example.com" is already in use by container "552a4f6ea9d933b454d53eb82cc54d98bb2ab93ad3e7f17e4f2e7b2122144d00". You have to remove (or rename) that container to be able to reuse that name.'
        
        Answer: ......
    - - Solution: https://stackoverflow.com/questions/47185654/cannot-create-container-for-hyperledger-service
        
        docker ps -qa | xargs docker stop
        
        Try multiple times if not working
        
        Very important
        
        You must bring down your network after using
        
        Finally, let’s test bringing down this network.
        
        Within the same terminal, do Control+C to exit the current execution.
        
        Then, run the following command:
        
        $ ./byfn.sh -m down
        
        Chain code location
        
        ...
  - - - How to change the data access rule in HLF and ETH?
      - Where does the Chaincode stored in HLF; and where does the Smart Contracts stored on ETH
      - How to change the data in HLF transaction?
      - How the find the history of Marble?
    - - There are two ways to develop smart contracts with Hyperledger Fabric:
      - Code individual contracts into standalone instances of chaincode
      - (More efficient way) Use chaincode to create decentralized applications that manage the lifecycle of one or multiple types of business contracts, and let the end users instantiate instances of contracts within these applications.
    - - init
      - invoke
      - As a developer, you must create both an Init and an Invoke method within your chaincode.
        The chaincode must be installed using the peer chaincode install command,
        and instantiated using the peer chaincode instantiate command before the chaincode can be invoked.
        Then, transactions can be created using the peer chaincode invoke or peer chaincode query commands.
  - - - Remove all Docker containers and images that we created in this tutorial with the following command in the tuna-app folder:
      - $ docker rm -f $(docker ps -aq)
      - $ docker rmi -f $(docker images -a -q)
- - - - Saving private and public key pairs
      - Sign transactions
      - Generate pub and priv keys
      - Public keys are the address to receive cryptocurrencies
    - - Functions of a Block object
        
        constructor
        
        toString
        
        genesis // used for building the genesis block
        
        mineBlock // link the next block
      - Run JS test
        
        before()
        beforeEach()
        after()
        afterEach()
- - - - If I want to build my own blockchain chain/DAO based on Hyperledger, where should I get started?
      - How to build a blockchain
        
        Starting with understanding the key terms and concepts
        
        Byzantine-fault tolerance (BFT)
        
        Permission Blockchain
        
        Proof of Work
        
        Byzantine general problem
      - What are the tools?
      - What are the rules?
      - Who controls it?
      - What are the applications on platform?
      - How to build a new consensus algorithm?
      - What is a good DEFINITION OF BLOCKCHAIN
      - The core technologies behind blockchain
      - What are the character words for blockchain?
        
        culpability, non-repudiation, incentivizes,
    - - Permissioning
        
        member enrollment certificates (eCerts)
        
        transaction certificates for each member (tCerts)
    - - Physical IT infrastructure layer
      - Blockchain middleware layer
      - blockchain consensus
    - - Asymmetric
        
        RSA (1024-8192)
        DSA (1024-3072)
        Diffie-Hellman
        KCDSA
        Elliptic Curve Cryptography (ECDSA, ECDH, ECIES) with named, user-defined, and brainpool curves.
      - Symmetric
        
        AES
        RC2
        RC4
        RC5
        CAST
        DES
        Triple DES
        ARIA
        SEED
      - Hash/msg digest/HMAC
        
        SHA-1
        SHA-2 (224-512)
        SSL3-MD5-MAC
        SSL3-SHA-1-MAC
        SM3
      - Random number generator
        
        FIPS 140-2 approved DRBG (SP 800-90 CTR mode)
- - - - How to build an ETH DApp?
      - What are the advantages
      - What is the structure of ETH?