{
  "manageEntity": {
    "action": "Save",
    "entityId": "197763546",
    "entityType": "Track",
    "nonce": "0x0bb99d23df91025a99a3b189ef14adc08544f025d3ecdea9308bbe919c955986",
    "signature": "0x502c6206b0671876a6514f67e4f95e2eac68962e1ea57728fe632ad38d85f19a7733095b8ebe9d19a66c41de34fae86b9f0a3d2ab278354d2ba95d171bf1b9cb1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}