{
  "manageEntity": {
    "action": "Save",
    "entityId": "830558",
    "entityType": "Track",
    "nonce": "0x3e97ff30ab026966da104db419bbab8bff89cbe4c0b2b7c85cd3a7ee32fa9184",
    "signature": "0x9047f207040bf533e3dd05836f596b016f3ae14ee05bc69a7d44564371ea55453fe2a889066938cf8cb771cb9796e27c0d7c5c01b4122a7d01735018df3924021c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}