{
  "manageEntity": {
    "action": "Save",
    "entityId": "550201882",
    "entityType": "Track",
    "nonce": "0xe59830ac5c15aa6ae907af3a3a0cf2fdff6b0ec6b3421040696464af6985c1da",
    "signature": "0x27a72e4b0af2bd25973d2831459f906e443a0303ae8976ed12ae4caac18da53c4e5ab9efe6acc637e6b1dfe0439627b620c3dd2533bb112a77400749077acf0d1c",
    "signer": "0xbbB98413eB671bb0000F0b18A2A7Cae9631043E1",
    "userId": "98311147"
  }
}