{
  "manageEntity": {
    "action": "Save",
    "entityId": "1200826333",
    "entityType": "Track",
    "nonce": "0x43c75369f342397949af94102cad212ed3b8355b1bf6969d0ad80fb9f39e8f41",
    "signature": "0xbb2c3ffd2e14f061477010c8095c40444e1eeace70aaaa10a0214479aebcd0ce05134edf3b344d315efcf59611fc0e86c2953cc94def87bd20e7c10fb70fa53f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}