{
  "manageEntity": {
    "action": "Save",
    "entityId": "1457966497",
    "entityType": "Track",
    "nonce": "0x971fd5c23676514e1d5dd4cded5d3443362aff5b563984a1319eae1ff89fbbe3",
    "signature": "0xccceeb447eb0752ae518489f1ac540446bf08fd48a71859fbba9e34c91ea5d4c742477654fc942997884c8f76ec27160b3fdb899b8368d6cc45841d59f22b4c51c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}