{
  "manageEntity": {
    "action": "Save",
    "entityId": "540927458",
    "entityType": "Track",
    "nonce": "0x6746dd4a5be89892b926e13aa0a3a6ec97394fa308c5b6790e5e51964ea6a49e",
    "signature": "0xc1044d94122ccef9c76e4ae837c556fc713c35dfa54cfeafedfc61fc07972258222fb1bce9ec311c216c2e8e7ad834b15d04b4d0a2de4e11d41e09cc4541996b1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}