{
  "manageEntity": {
    "action": "Save",
    "entityId": "972331131",
    "entityType": "Track",
    "nonce": "0x02981b739fc1b720e3166a4c01addce392a336b3fd7d05b5a973db6537744a2a",
    "signature": "0xc042dcdd224faebfcbc2ae450f7a9d48656eb94098aea2d2cb20c2d531c6101b09070bc0d1a945cc42134dcb17b4ff507ea599a9c472ce027d22ce5abe55c81e1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}