{
  "manageEntity": {
    "action": "Save",
    "entityId": "1752431728",
    "entityType": "Track",
    "nonce": "1786422840352127570",
    "signature": "0x3fae15e788eba50228c547c741398fc74ff16a3c627a843e25c08d8107153ea11a68580aff38452308d453ac62c41424d97854b3de1840f2ed16ca1a0ff4b1c21c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}