{
  "manageEntity": {
    "action": "Save",
    "entityId": "496121",
    "entityType": "Track",
    "nonce": "0xa21cae1e733b9434021bbb6073dcad6ea9329628a1c3b54df1bfdf2f5f3d9d71",
    "signature": "0xea3a9a90675ba29d68fa3e7935dc7fc5b452f6b91bd8f918369644c1e4859b5c7d93be6d2c29b7e28b1ae6b987430e8661df6a3fd960c78cbd210b6fc472e9d31c",
    "signer": "0x0e08C058dE1787206F03B99840c282498259E9C4",
    "userId": "589495545"
  }
}