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Example webpage to interact with MetaMask

Here you have a very simple website that, when run, allows you to connect your MetaMAsk and interact.

Use it to learn what the different parameters are; and how MetaMask builds a transaction in JavaScript.

Deploy a Ropsten node on Chainstack and use it as an endpoint for your MetaMask. Follow this link for instructions, Chainstack on MetaMask.

This way, you will be able to see the requests sent from MetaMask to the node on the Chainstack dashboard.

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How to uninstall and re-install Python 3 on Ubuntu

Uninstall and re-install Python 3 on Ubuntu 20.04 lts.

Table of contents

• Table of contents
• Uninstall Python3
  • List all python versions in default locations
  • Remove just the python3 package

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Install Go lang and the Bor client

Install Go lang and the Bor client on Ubuntu 20.04 lts.

Intall Go lang

We need at least version 1.19 of Go.

Install ubuntu updates

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Intro to StarkNet and Cairo

StarkNet is a permissionless decentralized ZK-Rollup operating as an L2 network over Ethereum, where any dApp can achieve unlimited scale for its computation. All this without compromising Ethereum’s composability and security.

Sources:

• Chainstack announces support for StarkNet
• A StarkNet odyssey: Overview and developer tools
• StarkNet and Cairo docs

Table of contents

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Deploy and verify a smart contract on StarkNet

On StarkNet, a smart contract can be verified programmatically directly from the terminal using StarkScan; the StarkNet contract verifier.

Table of contents

• Deploy a smart contract with Protostar
  • Cairo smart contract example
  • Deploy on StarkNet testnet with Protostar
• Deploy the contract on the StarkNet testnet

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%lang starknet
from starkware.cairo.common.cairo_builtins import HashBuiltin

// Store a variable
// Storage vars are by default not visible through the ABI. They are similar to "private" variables in Solidity.

// This variable is a felt and is called my_value_storage
// From within a smart contract, it can be read with my_value_storage.read() or written to with my_value_storage.write()

@storage_var

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This code uses the eth_getLogs method to retrieve logs. Logs are generated when an event is emitted from a smart contract. We look at the transfer event from ERC-20 contracts in this case.

Here is how logs work:

The transfer event in the ERC-20 contract looks like this:

event Transfer(address indexed from, address indexed to, uint value);

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Introduction to Solidity Programming

For: Beginners Key Words: program, smart contracts Last update by: Constantine Fomchenkov Last updated time: February 21, 2023 5:58 AM Topic: Fundementals

💻 This is a Solidity onboarding guide designed for beginners. You'll learn all the basics of Solidity, which is the language used for writing smart contracts on the Ethereum blockchain.

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Chat with Your Code: LlamaIndex and Activeloop Deep Lake for GitHub Repositories 🦙🌊

This guide is your quickstart toolkit for integrating LlamaIndex with Activeloop Deep Lake. You'll learn how to effortlessly index GitHub repositories into Deep Lake and interact with your code through natural language queries.

What are LlamaIndex and Activeloop Deep Lake?

LlamaIndex: Your Data Framework for LLMs

LlamaIndex is a bridge between your data and Language Learning Models (LLMs). Whether your data resides in APIs, SQL databases, or PDFs, LlamaIndex ingests and structures it into a format easily consumable by LLMs. It offers features like data connectors for various data sources, indexing capabilities for quick retrieval, and natural language query engines that make your data not just accessible but also interactive.

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To run this code:

1. Sign up with Chainstack.
2. Deploy a node.
3. View node access and credentials.

• Install Bun
• Run the code: