{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245087989",
    "entityType": "Track",
    "nonce": "0xd7803ae7136327718706dc11ee2af3ca298153a162036ada30be928453bc28ec",
    "signature": "0x1c2fc0fada0a870d1a4c3573590858f46793994c9b60cdde0d1754338950d3d10efc0a4dd3d8b38fcc5b614e766e6fcfb100a6b4ff150a285fc3d9c4eb32cf621c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}