{
  "manageEntity": {
    "action": "Save",
    "entityId": "303074",
    "entityType": "Track",
    "nonce": "0x2f1fc757cc0b5c66920f21ac77490b2e99ced5b77e9a638bfe463aec17f15792",
    "signature": "0x88d69f83512cc270a46a35034757d2b4ce6896759073caa18b55b127a39f681554e046da4ffc747ed6bd55282f78287a2e5f769b9c8202a419c736d21b7992551b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}