{
  "manageEntity": {
    "action": "Save",
    "entityId": "755082479",
    "entityType": "Track",
    "nonce": "0xe05699af7eebcf5658a977dbb3152db40c0aa0e88dd4d8aa19027319f038a222",
    "signature": "0x7e621922f302b207806bc14b9e27f001e4d359acdc1b87b102dca24f7727fae5371864179cb13c66c7c87efcb854aca8f842d7926e7894badefe79df8cabcac01c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}