{
  "manageEntity": {
    "action": "Save",
    "entityId": "667628419",
    "entityType": "Track",
    "nonce": "0x48a3af9b97c3409c5eaf7a43cc4defd9a4aa6c18fdca00aa65f2ca89ff275de3",
    "signature": "0x585b47c3591bc1204f6c5849c39976347f9734501e734edf0da75ce1d11113697190530ebc17f6566405f8c63966b2ddbb797d4b93e643becbc1525cf73933a01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}