{
  "manageEntity": {
    "action": "Save",
    "entityId": "73889861",
    "entityType": "Track",
    "nonce": "0x3ea2e825d9b6a67c7b67f96c4d8958bdfbb90814930494f1fea082b2a87587de",
    "signature": "0xd30fdd2c0d0cba54a9bed8dd0681d53c6dec9732dd9708fc90e0e6e4e56ccd207fc4050e93dcdd96b5c96def3261cb98a63137684607ba2830922502034108d81c",
    "signer": "0xe480AE2342a07a3A8aC8270e47bAFA10582414aD",
    "userId": "734972761"
  }
}