{
  "manageEntity": {
    "action": "Save",
    "entityId": "910472446",
    "entityType": "Track",
    "nonce": "0x303cc7288824da1c3fb054e7ce6ca55b7232e699143929ff13800d85810f4da4",
    "signature": "0x62c8f7b64b0a0545886d6a173646dde2c6e92d404c2c4039dd2d66c8214139a127ec140046b888cd117de18c924047526e61ccaebfe49364c0badb6b0fd49e711c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}