{
  "manageEntity": {
    "action": "Save",
    "entityId": "508017",
    "entityType": "Track",
    "nonce": "0x7c16585afdce89a53514753dfefdfc08ad0412d1de9f9a9dc98547046c93d1a8",
    "signature": "0x708e9bde0aadfef63c96edfc1839f6a3d78b283ed3e9497b4fe62ae13c56afb63d68c2df64df9894f386d2f1d7c7744347db98d657f66662aaf67fb2b63df9741b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}