{
  "manageEntity": {
    "action": "Save",
    "entityId": "221798",
    "entityType": "Track",
    "nonce": "0x38e93dd187b600d925a752f229a09b77ae462ced2e9dc330dedbd028b83712fb",
    "signature": "0x4181e8424aa1139fbfcd5a5751e7c3c18aa1527b9bafa7b66ade1fc308b64a561103ca81c470407422355158cdb998c07f3155a25384551a7e8c8e9d812269481b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}