{
  "manageEntity": {
    "action": "Save",
    "entityId": "887784",
    "entityType": "Track",
    "nonce": "0x5349102df1b68a1e73b8ac202c696aca32c8191dbbe264e9548226edf472a43d",
    "signature": "0xcb9fa95fc3fefc383b3cfa0706df910ca23716c1942752a4019afae35cbdabd355a352db9dedb9df72cae7628fa8a853659a052ea476ee211570693bf2f549341b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}