{
  "manageEntity": {
    "action": "Save",
    "entityId": "1518419250",
    "entityType": "Track",
    "nonce": "0x034bd5d586fd47a62e4d38694982548183843ab1f6181943f92057cc90fab8d7",
    "signature": "0x80cb3e4856e0a0ad7f47de47098481a595ae6ca43b3a6d53155d3680a2390d2c5b296a796d81b9cfc63d18a2811875215a37042e0215650af449aada66d65ce81c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}