{
  "manageEntity": {
    "action": "Save",
    "entityId": "508393",
    "entityType": "Track",
    "nonce": "0x9bd7348c391772585165d01aab92795aadb8e8d96cfa0172e21b3c5640468b30",
    "signature": "0x93ffef2538318d1bef673d75a07b6cc90b0b002099905c544832387f47f7a94c2cfd5eaf96f649781b5f8cf51268cfd8745a38d9551379e4869bd1d5de151eab1b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}