# Computation

The Computation layer covers CosmWasm smart contracts, business logic, and workflows on the **Verona** network (`xiond`, `xion-testnet-2`).

### Contract development notes

WASM binaries built with the **latest stable Rust** may fail to upload to Verona (`xiond tx wasm store`) because the chain does not support WebAssembly **bulk memory** instructions that newer Rust toolchains can emit.

If you run into store or validation errors after upgrading Rust, create `rust-toolchain.toml` at your **contract project root**:

```toml
[toolchain]
channel = "1.86"
targets = ["wasm32-unknown-unknown"]
```

**Why 1.86?** Rust **1.87+** stable releases may emit WebAssembly with **bulk memory** enabled for `wasm32-unknown-unknown`. Verona’s `wasm store` and runtime do not support bulk memory today, so uploads can fail even when local builds succeed. **1.86** is the latest stable release known to produce upload-compatible WASM for Verona at the time of writing (May 2026). When you upgrade Rust—or when Verona enables bulk memory—re-test `xiond tx wasm store` and update the pinned channel if needed.

Rebuild the contract (and re-run the [CosmWasm optimizer](/verona/build-on-verona/computation/local-development/deploy-a-cosmwasm-smart-contract.md) if you use Docker) before uploading again. See also the [local environment setup](/verona/build-on-verona/computation/local-development/setting-up-env/installation-prerequisites-setup-local-environment.md#rust) guide.

### Overview

Smart contracts on the Verona network are built using CosmWasm and enable:

* **Business Logic**: Automate workflows and processes
* **State Management**: Store and manage application state
* **Integration**: Connect with other Verona features (accounts, payments, verification)

### Quick Start

Get started quickly with pre-built app templates:

* [Zero to App in 5 Minutes](/verona/build-on-verona/computation/quick-start/zero-to-dapp-in-5-minutes.md)

### Local Development

Learn how to set up your development environment and deploy your first contract:

* [Setting up Environment](/verona/build-on-verona/computation/local-development/setting-up-env.md)
* [Interacting with the chain using the daemon CLI](/verona/build-on-verona/tools/daemon-cli.md)
* [Deploying Your First Smart Contract](/verona/build-on-verona/computation/local-development/deploy-a-cosmwasm-smart-contract.md)

### Contract Library

Browse pre-built, audited contracts you can use in your applications:

* [Re-using Existing Contracts](/verona/build-on-verona/computation/re-using-existing-contracts.md)

### Integrations

Learn how to integrate with Verona features:

* [Token Factory](/verona/build-on-verona/computation/integrations/token-factory.md)
* [Oracles](/verona/build-on-verona/computation/integrations/oracles.md)
* [Websockets](/verona/build-on-verona/computation/integrations/websockets.md)
* [Indexers: Optimized Data Retrieval](/verona/build-on-verona/computation/integrations/indexers.md)

### Use Cases

Explore more example applications and use cases:

* [More Use Cases](/verona/build-on-verona/computation/use-cases.md)


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