Glossary
Adding Token Balances
Account Balances
Balances must be stored and retrieved from the storage. To do that, we need to create a key for each account balance. For simplicity, we are going to use the account script hash as the key. The account script hash is a unique identifier for each account on the blockchain and is derived from the account’s public key.
Addresses and script hashes are interchangeable in the Neo blockchain. Script hashes are 20 bytes long and are represented as hexadecimal strings. Developer tools and SDKs will automatically convert the script hash to the correct format.
Adding the balanceOf Method
The NEP-17 standard defines a method to retrieve the balance of an account. The method is called balanceOf and it receives the account script hash as a parameter. The method must be marked as safe and should return an integer.
Add the following code to the smart contract:
If you are using Go, you will need to include the balanceOf in the safemethods property.
Run the balanceOf method by pressing Run. Select any account from the dropdown and press enter.
Since we haven’t added any balance to the storage, the method will return 0.
