{
  "manageEntity": {
    "action": "Save",
    "entityId": "691356174",
    "entityType": "Track",
    "nonce": "0xd84d97a387aab56bdd3464e1769bf670d3cdd98c0eb5c3491cbe9c480fa81c95",
    "signature": "0x9450983ead115c716d8484bb01b82a706351eb5eaf3b1ffafb948b007325666d6d7ec6722d99a19612dbd31dbfb0060aecd2abccb0e460e88353831f12c0f5981b",
    "signer": "0xC4F1D4AD65Aec4aa16A50FcbF32a9c685a22cf01",
    "userId": "551975061"
  }
}