In this story, I give some examples of use cases of NFTs in the Metaverse. NFTs helps companies to develop user engagement and brand recognition in the Metaverse. Generally speaking, NFTs develop the feeling of ownership, which increases the perception of value by users. Selling NFTs is also a new…

In this story, I focus on one of the pattern to protect against one of the main attacks: Reentrancy attack. ReentrancyGuard prevents reentrant calls to a function. By inheriting ReentrancyGuard, a contract can use the nonReentrant modifier, which ensures that a function cannot have nested (reentrant) calls to it. There…

This article presents key elements about Elastic Beanstalk, Cloud Formation, OpsWorks, and CodeDeploy. Elastic Beanstalk vs CloudFormation vs OpsWorks vs CodeDeploy CloudFormation Level: At the infrastructure level CloudFormation allows you to create AWS resources in an orderly and predictable way. This is called “infrastructure as code”. Use cases: Create and manage a hosted AWS Elastic Beanstalk application,

Recipe in english Ingredients 2 egg whites (100 g) 70 to 100g of caster sugar Preparation Preheat the oven to 80°C (th. 3) in a fan oven. Bring the egg whites to room temperature. Beat the egg whites until stiff, possibly with a pinch of salt. Add 20% of the sugar to tighten the egg…

This article presents key elements about Route 53. Alias vs CNAME records Criteria “cost”: CNAME charges for CNAME requests. Alias has no billing. Criteria “pointing”: CNAME can point to any hosted DNS record. Alias can only point to a CloudFormation distribution, Beanstalk environment, ELB, S3 bucket or a record in the same hosted zone. …

Overview The practice of “Stop, Start, Continue” helps to improve the working relationships between team members or the relationships of a team with others. The idea is to: give and receive feedback to team members about what they are doing that is helpful to others and what is not, receive ideas…

This story presents key elements about the AWS S3 service. The main features of S3 are: Transfer Acceleration allows to speed up data uploads by using CloudFront in reverse. Requester Pays allows the requester to pay for the requests and the data transfer on the S3 service. Events Notifications allows…

In this story, I present how the DevOps cycle can be applied as is to blockchain development. Only the “Operate” phase needs to be adapted to “Explore”. The phases of the CryptoDevOps cycle are : Plan Code, Build, Test, Release, Deploy, Explore, Monitor. Now, I’m going to introduce each phase…

DASP 10 (Decentralized Application Security Project, https://dasp.co/) is an initiative of NCC Group (https://www.nccgroup.trust/) identifying the top 10 categories of vulnerabilities in smart contracts developed with Solidity. Reentrancy AKA Race to empty, Recursive call vulnerability, Call to the unknown In this category, there are smart contracts that are vulnerable to reentrance…