Signatures

Use signatures with XMTP

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With XMTP, you can use various types of signatures to sign and verify payloads.

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Sign with an external wallet

When a user creates, adds, removes, or revokes an XMTP inbox's identity or installation, a signature is required.

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Sign with an XMTP key

You can sign something with XMTP keys. For example, you can sign with XMTP keys to send a payload to a backend.

Node

const signature = client.signWithInstallationKey(signatureText);

React Native

Kotlin

Swift

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Verify with the same installation that signed

You can also sign with XMTP keys and verify that a payload was sent by the same client.

Node

const signature = client.signWithInstallationKey(signatureText);

React Native

Kotlin

Swift

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Verify with the same inbox ID that signed

You can use an XMTP key's installationId to create a signature, then pass both the signature and installationId to another installationId with the same inboxId to verify that the signature came from a trusted sender.

Node

const isValidSignature = client.verifySignedWithPrivateKey(
  signatureText,
  signature,
  installationId
);

Kotlin

Swift