{
  "manageEntity": {
    "action": "Save",
    "entityId": "878689390",
    "entityType": "Track",
    "nonce": "0xefc57b5bb5d289a8f4319b077503ce6bb4aaa6373a46ee6ba60bfcfcd7580a48",
    "signature": "0x62652acdf4143de534ed29e0633c898cac421ea5ffbd61d628431607e71b0f5264ca7fa52bdcbbcaa826f8ddc080c6ca5a59aa589253d5b0c72703d1d1e3a6f41b",
    "signer": "0x767f09338Ac6CE8645c0a76a17a560429b582132",
    "userId": "520958130"
  }
}