{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557014320",
    "entityType": "Track",
    "nonce": "0x47ddc1d73c97f2502f925c16ec21932d86d20e6ff7e6901c867665c323f04eb0",
    "signature": "0x95ed105fa46fbe78eb628be442e017b24c03f714a8a97bc55cf65d045f163cfe6430b16a0dfaf626121792622967ab2adb49638240133496ba34983b3398a4ae1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}