MeroDocs

MeroDocs is a privacy-first e-signature platform built on Calimero.
It empowers users on independent nodes to securely collaborate and sign PDF contracts peer-to-peer,
all without centralized servers or intermediaries.

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Live Application

🔗 MeroDocs App

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Project Overview & Current Status

Default Context (User’s Private Workspace)

• Each user creates a private default context on their node.
• This context stores:
  • The user’s signature library
  • A list of agreements (shared contexts) the user belongs to

Creating or Joining Agreements

• Create Agreement: A user creates a new shared context and becomes the Admin.
• Invite Collaborators: The Admin generates an invite payload using other participants’ Calimero identity and assigns permissions (view/sign).
• Join Agreement: A user on a different node enters the invite payload and names the agreement on their node.

Shared Context Workflow

• Multiple users across nodes join a shared context.
• Within the shared agreement:
  • Users upload PDFs
  • Members can view or sign, according to their permissions
  • Access remains restricted to invited participants—no third parties have access

Signature Library

Each user can maintain a personal signature library within their private default context. This feature allows users to:

• Create and Store Signatures: Users can draw their digital signatures securely within their private workspace
• Reuse Signatures: Once created, signatures can be applied to multiple documents without recreating them
• Privacy-First Storage: All signatures remain stored locally on the user's node—never exposed to external parties
• Quick Access: Stored signatures are readily available when signing documents, streamlining the signing process

The signature library ensures both convenience and security, allowing users to maintain consistent digital signatures while preserving complete privacy and control over their signing credentials.

PDF Upload & Signing

• When a PDF is uploaded to the context, it is stored securely within the Calimero node
• After signing:
  • The signed PDF is saved back into the context
  • All documents remain encrypted and private within the user's Calimero context
• Document verification and integrity features will be available with future Calimero-based implementations

AI Legal Chatbot

An AI-powered legal chatbot feature is planned for future implementation using Calimero-based services. This feature will:

• Generate embeddings for uploaded documents and store them securely on the Calimero node
• Provide document analysis, question-answering, and summarization capabilities
• Maintain complete privacy by processing data locally on Calimero nodes
• Ensure all document content remains encrypted and never exposed to external parties

Note: This feature is currently under development and will be available in a future release.

Audit Trail

An audit trail feature for tracking user actions is planned for future implementation using Calimero-based services. This will provide:

• Document Upload Tracking: Record when documents are uploaded to a context
• User Consent Logging: Track explicit consent given before document signing
• Signing Event Recording: Log signing events with timestamps and user identities

Note: This feature is currently under development and will be available in a future release.

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Workflow Flowchart

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Features Overview

Feature	Description
Private Context	Local workspace per user for signature library and agreement list.
Agreement Creation	Create a shared context; you become its administrator.
Invitation System	Generate secure invite payloads tied to Calimero identities with permissions.
Join Agreement	Input invite payload to create shared context on your node.
Collaborative PDF Workflow	Users upload, view, and sign PDFs based on assigned roles in context.
Document Storage	All documents stored securely and encrypted within Calimero contexts.
Signature Library	Personal signature library stored in user's private default context.
AI Legal Chatbot	Coming soon - Privacy-preserving chatbot for document analysis (Calimero-based).
Audit Trail	Coming soon - Comprehensive audit logging (Calimero-based).
End‑to‑End Privacy	Documents are never exposed outside Calimero if not explicitly shared.

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Tutorial: App Setup

Logic

cd logic

chmod +x ./build.sh

./build.sh

Canister

For detailed canister setup and deployment, see merodocs_registry/BUILD.md.

Set up your environment variables as needed for your Calimero deployment.

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App

cd app

pnpm install

pnpm build

pnpm dev

Open the app in your browser and connect to your running node.

The app will be deployed and accessible at: http://localhost:5173/

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Initial Application Context Initialization

To initialize your application context, run:

cargo run -p meroctl -- --node nodeX context create --application-id <APP_ID> --params '{"is_private": true,"context_name": "default"}'

Replace <APP_ID>, nodeX, and other parameters as needed for your deployment.

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Technical Implementation Details

Calimero-Based Contexts

• User-specific default context stores local signatures and membership.
• Shared contexts are created or joined via invite payloads.
• All interactions (invite, upload, sign) use Calimero RPC and encryption.
• Documents are stored encrypted within Calimero contexts, ensuring complete privacy.

Future Enhancements

• Document verification and integrity features will be implemented using Calimero-based services
• AI Legal Chatbot will use Calimero-native AI services for document analysis
• Audit trail functionality will be built on Calimero's logging and verification capabilities

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Security & Privacy Assurance

• All documents remain encrypted within Calimero contexts.
• No files ever leave user nodes—complete end-to-end privacy.
• Access to documents is strictly permissioned, ensuring privacy and control.
• All data processing happens locally on Calimero nodes.
• Future AI features will maintain the same privacy-first approach, processing data entirely within Calimero infrastructure.

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