{
  "manageEntity": {
    "action": "Save",
    "entityId": "7888377",
    "entityType": "Track",
    "nonce": "0x23e7d82390b63967bf3f52e6faf87a7de722d2978945c358b3e3173633ce12b9",
    "signature": "0x3d535a251ddfd8a896410b01c105cd1b8f89e75a8b117f465eb471279c0c02de5dfb57812b31dafcd2d65b7dd654503e0838a016ba7f1f6290a0d270bb141b901c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}