{
  "manageEntity": {
    "action": "Save",
    "entityId": "475853691",
    "entityType": "Track",
    "nonce": "0xc3cd89542f720407b092b422a16c1b83b28d7230514c184e1ea58ce7b849a183",
    "signature": "0xb15344c2923f5ad9ab44d3005d2f7ca35b2623c171172e575e49a3a9bb8b81897221a7cb59dec67a2deafdd27badb1d0e1f67126cfa434e070b11e4d249bc5601b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}