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Login with NEARThe linkdrop contract We’re going to take a small detour to talk about the linkdrop smart contract. It’s best that we first understand this contract and its purpose, then discuss calling a method on this contract. The linkdrop contract is deployed to the accounts testnet and near, which are known as the top-level …
Login with NEARReplacing our solution hash So far in this tutorial, the user sends the plaintext solution to the crossword puzzle smart contract, where it’s hashed and compared with the known answer. This works, but we might want to be more careful and avoid sending the plaintext solution. Why? Blockchains rely on many computers processing …
Login with NEARAdd the login functionality Plan We’re going to add a login button that uses near-api-js to login with NEAR. Below is the workflow of logging in: User clicks the login button near-api-js creates a private key in the browser A redirect to NEAR Wallet occurs, passing the public key. NEAR Wallet (often) has …
Login with NEARIntermediate concepts This chapter will go a bit faster than the previous ones. We’re going to be covering an important part of smart contract development: cross-contract calls. Cross-contract calls A cross-contract call is when a smart contract calls another smart contract. For instance, if alice.near calls contract A, and contract A makes a …
Intermediate concepts (cross-contract calls and more) Read More »
Login with NEARAdding a puzzle We’re going to make a new puzzle, which means we need to provide the smart contract with a set of clues and info about the answers. Of course, we’ll not be sending the answers to the smart contract, otherwise everyone could see. We will, however, send details about each clue, …
Login with NEARLogging in with NEAR Previously… In the previous chapter we simply displayed whether the crossword puzzle was solved or not, by checking the solution hash against the user’s answers. Updates to transfer prize money In this chapter, our smart contract will send 5 Ⓝ to the first person who solves the puzzle. For …
Login with NEARStructs and enums Overview Structs If you’re not familiar with Rust, it may be confusing that there are no classes or inheritance like other programming languages. We’ll be exploring how to use structs, which are someone similar to classes, but perhaps simpler. Remember that there will be only one struct that gets the …
How to think about structs and enums when writing a Rust smart contract on NEAR Read More »
Login with NEARActions (including sending NEAR) We’re going to introduce a new Action: Transfer. In this chapter, we’d like the first person to solve the crossword puzzle to earn some prize money, sent in NEAR. Art by qiqi04.near We’ve already used Actions in the previous chapter, when we deployed and initialized the contract, which used …
Login with NEARDiving deeper In the last chapter we installed Rust and got up and running with a simple smart contract. The contract has a few issues, however, and isn’t as powerful as we’d like it to be. For instance, we can only store one crossword puzzle in the smart contract, the frontend is hardcoded, …
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