{
  "manageEntity": {
    "action": "Save",
    "entityId": "576704",
    "entityType": "Track",
    "nonce": "0x0111e4ff8b78e88a64b99e8e9a3afd46cae1ca3571e3fbda0e8addc1950d824c",
    "signature": "0x9aadeb489ae31ba7e8236a8de501c1bf326fd5644f30d180b97a347ec049a8c92602b5e538c69fd764fac5f129d6a616896c68d55b02ab963dcdd5c27b9b33451c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}