{
  "manageEntity": {
    "action": "Save",
    "entityId": "1274274570",
    "entityType": "Track",
    "nonce": "0x378e9ccb6b490555da24ff9969a7c5997f41238d4b9aaea73a80bf73900b4106",
    "signature": "0x5c979f965fd5ad4a1e330594b60cda00172ad2fc9dff886c32625adcdfeeeafe139accc4453bfc5220d3f4fba415e5092d1b80d2d0ade857bfc02e6308b72ed71b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}