{
  "manageEntity": {
    "action": "Save",
    "entityId": "899789441",
    "entityType": "Track",
    "nonce": "0x84bc99582a452daf70e4683b0362d69c939a0abb210566897f1c9abdc3cbe823",
    "signature": "0x2eaf0b16cd22edeb18f414b427808cbdeadd7edf546751ca6779c1e9fbd95b6a41b09c3ce131cbfc0a9143cafb3c5cef864f42cd000e786a2e2a81abe6d0d4f11c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}