January 22, 2023
In this article we'll learn what are libraries in solidity, the difference between using a library or contract inheritance, and review the most popular ones.
January 6, 2023
In this article cover error handling in Solidity using throw, revert and require see the differences in how they consume gas.
January 1, 2023
Explaining how to send blockchain transactions programatically using Ethers. This example is useful to send transactions from a backend or when you don't have a wallet and need to sign the transactions manually
September 16, 2022
In this article we explain what is the keccak256 hashing method and show some examples..
June 11, 2022
A detailed guide about how to create a button that automatically adds a blockchain to Metamask. No need to enter blockchain details manually
May 16, 2022
In this article we review what are smart contract interfaces in solidity and how to use them to interact with other contracts in the blockchain.
May 11, 2022
A detailed explanation of how to obtain the balance of a contract from the contract itself and for other contracts
April 21, 2022
In this quick tip I explain how to concatenate strings in Solidity and why it's done this way.
March 31, 2022
Explaining how to send blockchain transactions from a backend and understanding what Metamask does for us behind the scenes.
February 10, 2022
A walktrough of Ethernaut's smart contract hacking game second level, in which you can learn about constructors.
February 1, 2022
A walktrough of Ethernaut's smart contract hacking game first level, in which you can learn about fallback functions.
January 27, 2022
An introduction to Ethernaut, a smart contract hacking game to learn solidity advanced concepts, common hacks, and vulnerabilities.
January 24, 2022
A quick article explaining a very common scenario in web3 apps: sending ETH from a user's account to a smart contract
January 11, 2022
A detailed guide about how can you detect the network that Metamask is connected to and switch to the one your web3 app uses
January 4, 2022
A step-by-step guide explaning how to deploy a smart contract to the Rinkeby Ethereum test net using Alchemy
December 22, 2021
Another quick article with everything you need to know about how to handle dates and time in solidity smart contracts
November 21, 2021
Comparing strings is something very common in programming languages but in Solidity we do it a little different.
November 15, 2021
A detailed guide about functions visibility in Solidity explaining the difference between public and private, and internal and external
November 11, 2021
A quick review of the different places where you can store variables in Solidity: storage and memory
November 3, 2021
A detailed guide about functions in Solidity explaining how to declare them, return statements, visibility, and types (view and pure)
November 1, 2021
Continuation of the previous article about data types, now reviewing complex way to store and handle data using structs, arrays and mappings.
October 30, 2021
An introduction to the most basic data types in Solidity: integers, strings, booleans and addresses
October 29, 2021
A step-by-step guide on how to import local contracts in Solidity and how to adapt the deployment script to store their deployment address and make sure they work.