{
  "manageEntity": {
    "action": "Save",
    "entityId": "840391876",
    "entityType": "Track",
    "nonce": "0x4e471179b4e054a5c09658130d70acb0e5abb334a5d6852e97b9fbebfddacbec",
    "signature": "0x41c58905356edbc7a7bc0685bb7166f6f569634dd6e723fdbcad0367632ddb5d1e0f298fdd818be00bfb19bf422155e50bfcf83aafd0899005630daef4303c311c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}