Blockchain app testing helps in the creation of smart records and the prevention of fraud, while blocks are used to store data in the blockchain. There are various types of blockchain testing, such as functional, performance, and security testing. There are numerous tools available for testing, and blockchains are classified into two types: public and private. Appsierra is a testing company that offers these services and they have high expertise in blockchain testing and also they give the best solutions for testing issues.