{
  "manageEntity": {
    "action": "Save",
    "entityId": "247918",
    "entityType": "Track",
    "nonce": "0xf7f27f6781aef9a5702ba8cb1fac8ea31e88d7fc5a3523e006f02291afbaf0c8",
    "signature": "0xab3c510f4226d5cacbec8d9148b3416fb66f8f66464b6cad0ce6356c23e60a45536e5ceeb844be2952c2249080b9ab3298a0e5dbf894372228e956312c87777c1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}