{
  "manageEntity": {
    "action": "Save",
    "entityId": "61937",
    "entityType": "Track",
    "nonce": "0xf8794d39e6888c0975905eb4d0d447500e290d9550ffdbf6d6ebe3b7916ef1f0",
    "signature": "0xa04b99e9b99b06d0480c237e7a5094030ec64d858e26acd229137f9f1018354310abd26ff2a2335b9d2ef969d15986cc9f21f81fd3be6c5492f85e8526c156d11c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}