{
  "manageEntity": {
    "action": "Save",
    "entityId": "1600609365",
    "entityType": "Track",
    "nonce": "0x31710b9ba653a2aebdf509d2189bc2ba285870be117d6ea4a522d585f8c1e87a",
    "signature": "0x07995b2acb32d499b5b2fbf431e3dce4739aa5b0a4a4154fd7273eaa53eed091363a7ab81bf4e2f2faf6122eabdce6ddcec8c729238d2db20c3cf328353830151b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}