Send builds in the open. Start with Sigilry.

Allen

2026

Engineering

A “Connect wallet” button looks simple. Behind it, an app needs to find the wallet, ask for access, track account changes, and follow a transaction through approval and completion. That's a lot of work behind two words.

Meet Sigilry, the open-source toolkit Send builds and maintains for connecting apps to wallets on Canton Network. It's already used in production by Send's Canton apps. The repository is public. The core packages, @sigilry/dapp and @sigilry/react, are MIT-licensed. Docs · Source

Sigilry is meant to be the art of signing. Today's world of onchain finance requires careful consideration of custodianship, authority, and protocols. The world is ever changing, and implementing open standards means we gain interoperability, which enables composability. Sigilry is the open-source toolkit for building applications on Canton Network today, on top of existing wallets.

This is the first Send Engineering League (SEL) spotlight on our open-source tools.

Send Connect, the way Canton apps connect to a Send wallet, is built on an open standard: CIP-0103, Canton's app-to-wallet interface. Sigilry implements that standard. It gives developers a common way to request a connection, read authorized accounts, submit transactions, and receive updates when wallet or transaction state changes. For apps built with React, it also supplies reusable connection and account helpers. Core toolkit · React integration

Use what you need, and send fixes back. The current core package, @sigilry/dapp, is 3.4.0; both the core and React packages use the stable 3.x line. npm · Installation and contributing

Credit to Allen for the core toolkit and Brandon for the WalletConnect and provider work.

Building a Canton app? Start at sigilry.org. The Send Connect testnet guide covers installing the desktop browser extension and connecting an app on testnet. The public repo accepts issues and contributions.

What's next

There is more public work to cover: Homebrew Canton, a tool for installing Canton, and Recall, a tool for finding earlier coding-agent sessions and following current work. They're candidates for later SEL spotlights. Sigilry is where this one starts.

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