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---
title: Message Verification and Signing
description: Bitcoin Message Verification and Signing.
---
# Message Verification and Signing
## Description
Bitcore implementation of [bitcoin message signing and verification]
(http://bitcoin.stackexchange.com/questions/3337/what-are-the-safety-guidelines-for-using-the-sign-message-feature/3339#3339).
This is used to cryptographically prove that a certain message was signed by the holder of an address private key.
Bitcore implementation of [bitcoin message signing and verification](http://bitcoin.stackexchange.com/questions/3337/what-are-the-safety-guidelines-for-using-the-sign-message-feature/3339#3339). This is used to cryptographically prove that a certain message was signed by the holder of an address private key.
For more information refer to the [bitcore-message](https://github.com/bitpay/bitcore-message) github repo.
## Installation
Message Verification and Signing is implemented as a separate module and you must add it to your dependencies:
For node projects:
```bash
npm install bitcore-message --save
```
For client-side projects:
```bash
bower install bitcore-message --save
```
## Example
To sign a message:
```javascript