> ## Documentation Index
> Fetch the complete documentation index at: https://t2z.d4mr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Build Zcash transactions from transparent inputs to shielded Orchard outputs

<img className="rounded-lg" src="https://mintcdn.com/d4mr/nSoESvgLLwdv6exo/images/t2z_hero.png?fit=max&auto=format&n=nSoESvgLLwdv6exo&q=85&s=9dc9000f30b80545da16ffd2ebe794d5" alt="t2z - portable libraries for transparent → shielded transactions" width="1920" height="1080" data-path="images/t2z_hero.png" />

## What is t2z?

**t2z** (transparent-to-z) is a multi-platform library for building Zcash transactions that send from **transparent inputs** to **shielded Orchard outputs**.

It implements the [PCZT (Partially Constructed Zcash Transaction)](https://github.com/zcash/zips/pull/1063) format defined in ZIP 374, enabling:

* **Multi-party transaction construction** — Different parties can contribute inputs, signatures, and proofs
* **Hardware wallet support** — External signing via `get_sighash` + `append_signature`
* **Cross-platform** — Available for TypeScript, Go, and Kotlin

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/quickstart">
    Install and build your first transaction in minutes.
  </Card>

  <Card title="Live Demo" icon="play" href="https://t2z-wasm-demo.d4mr.com">
    Try the interactive transaction builder.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference">
    Complete function documentation.
  </Card>

  <Card title="GitHub" icon="github" href="https://github.com/d4mr/t2z">
    View source and contribute.
  </Card>
</CardGroup>

## Available SDKs

<CardGroup cols={3}>
  <Card title="TypeScript" icon="js" href="/platforms/typescript">
    **@d4mr/t2z-wasm**

    Browser & Node.js via WebAssembly

    <Badge>Available</Badge>
  </Card>

  <Card title="Go" icon="golang" href="/platforms/golang">
    **github.com/d4mr/t2z/sdks/go**

    Native Go via CGO/UniFFI

    <Badge>Available</Badge>
  </Card>

  <Card title="Kotlin" icon="android" href="/platforms/kotlin">
    **com.d4mr.t2z**

    Android & JVM via UniFFI

    <Badge>Available</Badge>
  </Card>
</CardGroup>

## Why t2z?

### 🔐 Privacy Upgrade Path

Enable existing transparent-only Zcash infrastructure to send to shielded addresses without requiring a full wallet implementation.

### 📦 PCZT Format

Full [ZIP 374](https://github.com/zcash/zips/pull/1063) support allows transactions to be constructed across multiple parties, systems, or hardware devices.

### ⚡ No Downloads Required

Unlike Sapling which requires \~50MB proving key downloads, Orchard uses Halo 2 — the proving key is built programmatically on first use (\~10 seconds, cached thereafter).

### 🦀 Battle-Tested Core

All SDKs share the same Rust core built on official Zcash libraries (`zcash_primitives`, `orchard`, `pczt`), ensuring consistent behavior across platforms.

## Transaction Flow

A t2z transaction follows this flow:

<Steps>
  <Step title="Propose">
    Create a PCZT from transparent inputs and payment outputs.
  </Step>

  <Step title="Verify (Optional)">
    Verify the PCZT matches the original request before signing.
  </Step>

  <Step title="Sign">
    Add signatures for each transparent input.
  </Step>

  <Step title="Prove">
    Generate Orchard zero-knowledge proofs.
  </Step>

  <Step title="Finalize">
    Extract the final transaction bytes for broadcast.
  </Step>
</Steps>

<Card title="Learn the Flow" icon="arrow-right" href="/flow/overview">
  Dive deep into each step of the transaction flow.
</Card>

## Supported Features

| Feature                   | Status          |
| ------------------------- | --------------- |
| Transparent → Orchard     | ✅ Supported     |
| Transparent → Transparent | ✅ Supported     |
| Multiple inputs           | ✅ Supported     |
| Multiple outputs          | ✅ Supported     |
| Memos                     | ✅ Supported     |
| ZIP 317 fees              | ✅ Automatic     |
| External signing          | ✅ Supported     |
| Sapling outputs           | ❌ Not supported |
| Orchard inputs            | ❌ Not supported |

<Note>
  t2z is designed specifically for transparent-to-shielded use cases. For full wallet functionality including shielded-to-shielded transactions, see [Zashi](https://electriccoin.co/zashi/) or [Ywallet](https://ywallet.app/).
</Note>

## Related Specifications

* [ZIP 374](https://github.com/zcash/zips/pull/1063) — Partially Constructed Zcash Transaction Format
* [ZIP 244](https://zips.z.cash/zip-0244) — Transaction Identifier and Signature Validation
* [ZIP 317](https://zips.z.cash/zip-0317) — Proportional Transfer Fee Mechanism
* [ZIP 321](https://zips.z.cash/zip-0321) — Payment Request URIs