{
  "manageEntity": {
    "action": "Save",
    "entityId": "1401578604",
    "entityType": "Track",
    "nonce": "0xd1f9a5c37b4b85690607feb4f10b967e6d21a0e4a6d41c3177814aba496cba8f",
    "signature": "0x990ca02f6e62194607a9ca2007e594c4e25e83f391a8e99dc2bd471e1f932e3022b089d0f8a48c0b7ab6979531b283be4256f24edfa848c7c135f1f2e11adebb1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}