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About How-to Guides

Explore the how-to guides for IOTA Smart Contracts, offering step-by-step instructions on various topics and functionalities.

Before You Start

A guide to familiarizing yourself with the IOTA repository, branch and network structure, SDKs, CLI, and recommended IDEs and plugins.

Call Context

The call context is a predefined parameter to each smart contract function, which allows you to access the functionality that the call environment provides.

Calling a Smart Contract

Smart contracts can be invoked through their entry points, from outside via a request, or from inside via a call.

Consensus

IOTA Smart Contracts consensus is how Layer 2 validators agree to change the chain state in the same way.

Decentralized Identifiers (DID)

The Decentralized Identifiers (DID) standard from W3C is the fundamental standard that supports the concept of a decentralized digital identity. Explore the basic aspects of the DID standard.

Getting Started

An introduction to getting started with IOTA Rebased development.

How Accounts Work

IOTA Smart Contracts chains keep a ledger of on-chain account balances. On-chain accounts are identified by an AgentID.

Introduction

The current release of IOTA Smart Contracts also has experimental support for EVM/Solidity, providing limited compatibility with existing smart contracts and tooling from other EVM based chains like Ethereum.

Sandbox Interface

Smart Contracts can only interact with the world by using the Sandbox interface which provides limited and deterministic access to the state through a key/value storage abstraction.

Smart Contracts

Smart contracts are applications you can trust that run on a distributed network with multiple validators all executing and validating the same code.

State, Transitions, and State Anchoring

The state of the chain consists of balances of native IOTA digital assets and a collection of key/value pairs which represents use case-specific data stored in the chain by its smart contracts outside the UTXO ledger.

The IOTA Repository

A guide to familiarizing yourself with the IOTA repository, including branch and network structure.

Validators

Each chain is run by a network of validator nodes which run a consensus on the chain state update.

Verifiable Credentials

Verifiable credentials are statements about the holder. They can be verified online or in person, and the holder decides who to share them with.

Verifiable Presentations

Verifiable presentations are a way for a holder to present one or more verifiable credentials to a verifier.