---
title: "Motr WASM Light-Node"
sidebarTitle: "Motr Overview"
description: "Learn how to use the Motor WASM plugin as an MPC-based UCAN source for decentralized token operations"
icon: "play"
---

# Motor WASM Plugin: UCAN Source

The Motor WASM plugin is a WebAssembly-based plugin that provides Multi-Party Computation (MPC) powered UCAN (User-Controlled Authorization Networks) token generation and management.

## Overview

The Motor plugin enables secure, decentralized token creation and management through an MPC-based architecture. It provides the following key capabilities:

- Secure token generation
- MPC-based signing
- Flexible UCAN token creation
- Integrated enclave management

## Environment Configuration

To use the Motor plugin, you need to set the following PDK environment variables:

```json
{
  "chain_id": "sonr-testnet-1",  // Blockchain network
  "enclave": { ... },            // MPC enclave configuration
  "vault_config": { ... }        // Optional vault configuration
}
```

## UCAN Token Creation

### Creating Origin Tokens

```go
type NewOriginTokenRequest struct {
    AudienceDID  string                   // Target DID
    Attenuations []map[string]any // Optional restrictions
    Facts        []string                 // Additional claims
    NotBefore    int64                    // Token activation time
    ExpiresAt    int64                    // Token expiration time
}
```

Example usage:

```go
request := NewOriginTokenRequest{
    AudienceDID: "did:example:target-did",
    Attenuations: []{
        {"capability": "read", "resource": "/data"}
    },
    Facts: ["authenticated_user"],
    NotBefore: time.Now().Unix(),
    ExpiresAt: time.Now().Add(24 * time.Hour).Unix()
}
```

### Creating Attenuated Tokens

```go
type NewAttenuatedTokenRequest struct {
    ParentToken  string                   // Previous token to derive from
    AudienceDID  string                   // Target DID
    Attenuations []map[string]any // Token restrictions
    Facts        []string                 // Additional claims
    NotBefore    int64                    // Token activation time
    ExpiresAt    int64                    // Token expiration time
}
```

## Signing and Verification

The Motor plugin provides methods for data signing and verification:

```go
// Sign data using MPC enclave
func SignData(data []byte) (signature []byte, err error)

// Verify signed data
func VerifyData(data, signature []byte) (valid bool, err error)
```

## Error Handling

The plugin returns structured error responses with detailed error messages:

```go
type UCANTokenResponse struct {
    Token   string  // Generated token
    Issuer  string  // Token issuer DID
    Address string  // Blockchain address
    Error   string  // Error message (if any)
}
```

## Best Practices

1. Always validate the enclave before generating tokens
2. Use the shortest possible token lifetime
3. Implement granular attenuations
4. Validate tokens before using them

## Security Considerations

- MPC ensures no single party controls the entire signing process
- Tokens are cryptographically signed using distributed key shares
- Supports multiple key types: Ed25519, Secp256k1, RSA

## Advanced Configuration

For advanced MPC enclave configurations, refer to the DWN configuration documentation.