In the previous chapter, we launched a test network using fabric samples and created a channel to interact with the peers and chaincode. Chaincode is where you apply your business logic to the blockchain. In this chapter we will be: Creating chaincode Packaging the chaincode Installing the chaincode on peers …

What is Hyperledger Fabric? Hyperledger Fabric is an open-source private distributed ledger technology created by the Linux Foundation. Fabric supports smart contracts, aka chaincodes written in Go, Java and Node.js. If you are new to the fabric I suggest you read the Fabric's official documentation to get an understanding of Peers, Certificates, Channels, etc. …

Solidity smart contracts can also hold ERC-20 tokens like it holds native coins such as ETH/MATIC/BNB. Holding ERC-20 in a contract is for multiple purposes. It can be for Staking, Locking and Releasing tokens, Banking and etc. New to trading? Try crypto trading bots or copy trading on best crypto…

Tokenization is one of the key features of Blockchain. You can tokenize any physical or digital items and convert them into single or multiple tokens. Doing this keeps your asset secured and easy to use. What is SBT? In tokenization, tokens can be transferrable through the owner's consent. Documents like Birth Certificates and…

What is NFT? NFT aka Non-fungible tokens are a trend amongst Blockchains. The EVM standard for NFTs can be ERC-721 and ERC-1155 (Multi-token Standard). NFTs can be sold on marketplaces such as Opensea, Rarible, LooksRare. What is Royalty? Royalties are a percentage (commission) for the creator/artist of the NFT for every secondary sale done on the…

Denial of Service (DoS) Attack So what is a Denial of Service attack aka DoS attack? Well, it is an attack that is performed to prevent your smart contract from executing its function accessible to its designated users. Let us take the KingOfEther contract example: The example has two contracts, one is the victim contract that is “KingOfEther.sol” …

Not all your smart contract’s function is accessed by wallet address aka users, sometimes the contract’s function can be accessed by other smart contracts. You should always be aware of your function accessibility, by protecting your functions with relevant access modifiers. Reentrancy Attack Reentrancy attacks are commonly programmed to automatically steal the…