{
  "manageEntity": {
    "action": "Save",
    "entityId": "1559253715",
    "entityType": "Track",
    "nonce": "0x16cc7aaf71641ba7da4616309272aa6fd0cbc9eb55c084f688c3eeb960a7348c",
    "signature": "0x9fd2b087c2b07e03b9b4c9ceb7ed24c858382692d62fda959782d2fab998b3f07751f21efd89de9c2222576167bade63a94aa6b4cf1ac031867b93b3494fd6441b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}