{
  "manageEntity": {
    "action": "Save",
    "entityId": "1301427938",
    "entityType": "Track",
    "nonce": "0x973497621b799c16f57b8d0388e378c1d9b8c745904c4147eae13542145397ae",
    "signature": "0x46b7c251438baa3d938b47a7fcac0935d478f13d96ab6376cdad4e9b7d981a0964a7af02d35cd44f5e71a53f0d14cb450b5bb355ba32cbfbc8a7d9434fecf08d1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}