{
  "manageEntity": {
    "action": "Save",
    "entityId": "1453818267",
    "entityType": "Track",
    "nonce": "0x9b6d3d2518bb4f163fee6fe0c4a47d984c99f564609f7c1b616b05377aed06a7",
    "signature": "0xbbc95fcf5bee77e557abcb2ff395a4a48e2d8b4ce94e1c4acaa5ac1604ead2ab6fc0988227048d422600d8b3baf66dd844eade26bcdd95992d381561a0b0f3611c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}