---
# System prepended metadata

title: Blockchain Notes and important links

---

# Blockchain Notes and important links


### Public Chains: (GUI- Metamask, API- Infura)

* Mainnet
* Rinkeby
* Ropsten
* Kovan
* Goerli

### Local chains: (GUI - remix Javascript-VM, API - truffle)
* localhost:8545 for truffle framework


### Concepts:
* Nonce
* Account Address  or Wallet Address
* Contract Address
* Public key, private key
* ABI, Bytecode
* Solidity programme language (OOPS based)
* Swapping token
* ERC20 and other token standards
* Gas price and its calculation
* Fee for Transaction
* Burn token
* Mining in blockchain



### Libraries, tools involved for NodeJS blockchain layer
* web3
* ethereumjs-tx
* ethereumjs-wallet
* keythereum


### Selected Chain for testing - Rinkeby:

Links:
* Chain stats: https://www.rinkeby.io/#stats
* Chain Explorer: https://rinkeby.etherscan.io


![](https://i.imgur.com/fra5wQ1.jpg)
