{
  "manageEntity": {
    "action": "Save",
    "entityId": "379923944",
    "entityType": "Track",
    "nonce": "0x9a7afe08ad2aad25a0476ea9cae378aad90e73a9818ba36417ca465a821704ca",
    "signature": "0xd894045328cd38fcedc85a27e4788fe2553762e4f3fc9be1ecece43519f90acd2cc852e0ea42f37a336fc11471442fbfa7cda2ad4f04977bbdbd6f5d5a3fcab31b",
    "signer": "0x354f479338B7F1593E5Ed2Bdb91a09c4bD12996C",
    "userId": "381478870"
  }
}