> ## Documentation Index
> Fetch the complete documentation index at: https://trust-link-tsn.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# device/key-fingerprints API

> Source-derived exports, parameter and result types, public methods and source links.

This reference is generated from the checked-out TypeScript exports. Types and signatures describe the package contract; source presence does not establish deployment or service availability. Error expressions below are direct throws, not an exhaustive list of failures from dependencies.

[Source module](https://github.com/bigdreamsweb3/trustlink-pay/blob/main/tsn-protocol/sdks/tsn-sdk/src/device/key-fingerprints.ts). See the [reference index](https://trust-link-tsn.mintlify.site/sdk/api-reference.md) for package import boundaries and verification scope.

## fingerprintDeviceSigningPublicKey

Import from `@trustlink/tsn-sdk` or `@trustlink/tsn-sdk/device`. [Implementation, line 3](https://github.com/bigdreamsweb3/trustlink-pay/blob/main/tsn-protocol/sdks/tsn-sdk/src/device/key-fingerprints.ts#L3).

```ts theme={null}
fingerprintDeviceSigningPublicKey(publicKey: JsonWebKey): Promise<string>
```

## fingerprintEncryptionPublicKey

Import from `@trustlink/tsn-sdk` or `@trustlink/tsn-sdk/device`. [Implementation, line 12](https://github.com/bigdreamsweb3/trustlink-pay/blob/main/tsn-protocol/sdks/tsn-sdk/src/device/key-fingerprints.ts#L12).

```ts theme={null}
fingerprintEncryptionPublicKey(publicKey: JsonWebKey, purpose: "device" | "recovery"): Promise<string>
```


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