{
  "manageEntity": {
    "action": "Save",
    "entityId": "919691340",
    "entityType": "Track",
    "nonce": "0xcfae8b366965ba26cd6bc13aae57b13f1bf52abb99f988aa3a8404d363e290e1",
    "signature": "0x1a3d06701896ef4acc41090f62a863c13c05646b064125fd181840312f24fbd623a076b407db861c062d73983de9c5dbabecd6d6f18fb1edc3f7ec10ea30e5141b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}