{
  "manageEntity": {
    "action": "Save",
    "entityId": "1453896220",
    "entityType": "Track",
    "nonce": "0x0fe046b8c39216690e8279ac88124e22590a8f60b21b32fdf2ec1e8e9c0cb61b",
    "signature": "0xf10b1f2d0f7e7c2554b7f30abfc82d4d684b9bc96157e39f8e05f8404a6374e37813d75131762abc6ba27f8dd6710aa489529aa488de4de99df94cb0d8d13be71b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}