---
title: "Store electronic signatures with Instant JSON"
canonical_url: "https://www.nutrient.io/guides/ios/knowledge-base/store-electronic-signatures-from-instant-json-annotations/"
md_url: "https://www.nutrient.io/guides/ios/knowledge-base/store-electronic-signatures-from-instant-json-annotations.md"
last_updated: "2026-06-09T10:31:08.596Z"
description: "Learn to create and store electronic signatures with Instant JSON annotations and KeychainSignatureStore."
---

# How to store electronic signatures using Instant JSON

To store electronic signatures in the signature store using annotations provided via Instant JSON, you can use a custom [`SignatureStore`](https://www.nutrient.io/api/ios/documentation/pspdfkitui/signaturestore) implementation. This populates the signature store with annotations from Instant JSON. In turn, this means that those annotations can then be used to create a new signature.

By leveraging the existing [`KeychainSignatureStore`](https://www.nutrient.io/api/ios/documentation/pspdfkitui/keychainsignaturestore), you don’t even have to add the serialization yourself, and therefore, all annotations that were added either via Instant JSON or via the UI will be saved to disk.

This is the logic to implement a signature store that accepts Instant JSON to populate it:

```swift

class InstantJSONSignatureStore: KeychainSignatureStore {
    func addAnnotationUsingJSON(_ json: String, documentProvider: PDFDocumentProvider) throws {
        guard let jsonData = json.data(using:.utf8) else { return }
        let annotation = try Annotation(fromInstantJSON: jsonData, documentProvider: documentProvider)
        let container = SignatureContainer(signatureAnnotation: annotation, signer: nil, biometricProperties: nil)
        addSignature(container)
    }
}

```

And to use it, here’s example code:

```swift

let json = "..." // Instant JSON Annotation

let jsonSignatureStore = InstantJSONSignatureStore()

document.didCreateDocumentProviderBlock = { documentProvider in
    try? jsonSignatureStore.addAnnotationUsingJSON(json, documentProvider: documentProvider)
}

let controller = PDFViewController(document: document) {
    $0.signatureStore = jsonSignatureStore
}

```
---

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