{
  "manageEntity": {
    "action": "Save",
    "entityId": "1464216637",
    "entityType": "Track",
    "nonce": "0x8dfc03ea9a5499cb6aa185aa289ed871dd80de4a641ce9bc8bced2c7ad8d04cb",
    "signature": "0xe8171f22f9790031af4692489bc8a9644ddf918fbacb5f5c4b856c1a0c1486ae5413cb22a26bf8fac3b98363b64181a574cbebf9131f87da72d5ab22a6afd5c81c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}