{
  "manageEntity": {
    "action": "Save",
    "entityId": "388567",
    "entityType": "Track",
    "nonce": "0x7fda328691c37afb603aae9f2cb6a4dfd9bcf4e8947af5d6811958a67f713a34",
    "signature": "0x0615c3da5126dc1297dd4b02a81689112606d556ce1070c45001d18ab861ad71625d1d4edcfaaf05e2ae6506aa726a1e5d0737d31bdefeb2b9a356de376d78541c",
    "signer": "0xDD3Cb841c7f19ec5581F8E2b14d6f7a58B92d0F7",
    "userId": "582464754"
  }
}