{
  "manageEntity": {
    "action": "Save",
    "entityId": "487619362",
    "entityType": "Track",
    "nonce": "0x6bf38971a3a86448548c18d6b86611bed80f15369580138c8e1a52a9ab1b060f",
    "signature": "0x7794555b837587edf77c37dd552ebc5a5a856a6ba89f93ddd65e2f1d3525a17726a650efd51616751aaa8ac525cd8c4bce3cd3f7878fc68c53b4d9b05f7280211b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}