# Write your first Daml Contract I Jatin Pandya

- Channel: [ETHGlobal](https://streameth.org/ethglobal)
- Date: 2026-06-09
- Duration: 30:44
- Topics: DAML, DPM, Canton, Canton Network, smart contracts, Jatin Pandya, package manager, templates, choices, signatories, observers, parties, proof of stakeholders, invoice, DAR file, DAMLC, hackathon, Ethereum, Solidity, privacy model, UTXO, ledger, access control, ensure, controller, test scripts, build, sandbox, finance, tokenization, Web3, blockchain, CLI, scaffolding, VS Code, modules, package hex, deploy, dispute
- Watch: https://streameth.org/watch/yt-3dHtm3vvTyo
- YouTube: https://www.youtube.com/watch?v=3dHtm3vvTyo

## Description

In this workshop, Jatin Pandya walks through writing a first DAML smart contract on the Canton network and building, testing, and inspecting it using DPM, the DAML package manager. He starts by pointing developers to docs.canton.network where they can find tutorials including Module 2, which compares Canton to Ethereum for hackathon builders coming from a Solidity background. Jatin explains that DPM is a CLI tool covering the full lifecycle of DAML development, from scaffolding new projects to building, testing, and interacting with smart contracts.

Jatin live codes an invoice smart contract featuring two parties (seller and buyer), an amount, a paid status, and a description. He explains DAML's core concepts: templates instead of smart contracts, choices instead of functions, and the proof of stakeholders model using signatories (who must sign actions) and observers (who can see state changes). The contract includes ensure clauses to validate positive amounts, a pay choice that returns a receipt, and a dispute choice with a required reason. He runs dpm build to compile the DAML code into a DAR file ready for ledger deployment, dpm test to execute test scripts achieving 100% pass rate, and dpm damlc inspect-dar to retrieve the package hex string used as the contract's identity on the Canton ledger.

00:00 Introduction
00:20 Where to Find Canton Documentation
01:19 What Is DPM (DAML Package Manager)
02:00 Installing DPM and Checking Versions
03:43 Exploring DPM Commands
04:51 Listing Available DAML Templates
06:01 Creating a New DAML Project from Scratch
07:23 Setting Up the Invoice DAML File
07:58 DAML VS Code Extensions Overview
08:53 Writing the Module and Importing DAML Script
09:50 Defining a Template with Parameters
11:14 Understanding Parties as Canton Addresses
12:27 Signatories vs Observers: Proof of Stakeholders
14:09 Using Ensure to Validate Amount
15:23 Choices: The DAML Version of Functions
16:18 Writing the Pay Choice with Controller
19:47 Adding a Dispute Choice with Reason
22:07 Completed Smart Contract Walkthrough
23:18 Writing Test Scripts with Alice and Bob
24:44 Running DPM Build to Generate the DAR File
26:01 Running DPM Test for Coverage Summary
27:13 Using DPM DAMLC to Inspect DAR Files
28:04 Extracting Package Hex String for Ledger Identity
29:44 Closing Remarks

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