{
  "manageEntity": {
    "action": "Save",
    "entityId": "2122213097",
    "entityType": "Track",
    "nonce": "0x455f2154310855bae2c574c5bc11b93428aac32a376297a57ce6a5e3145deddc",
    "signature": "0x7d364d799476949fe4473555a3be405ee15b80cf9ed567ea5d9d7205e76d1f430bc86f8a654b6b8fa77cbd394d58c22f6e6fd5d3ca67609b5fa63467ecd41e171c",
    "signer": "0xF853B69926C63C459c06feF86A641F3b770aAa4E",
    "userId": "579563947"
  }
}