{
  "manageEntity": {
    "action": "Save",
    "entityId": "870050645",
    "entityType": "Track",
    "nonce": "0xe0264f9ad5681a5bcd54a763e4b8c010c32950f1188d08e23897e39a40a7a817",
    "signature": "0xe5275001b7d7cf454849f87f62e0f2e44a033acbea13afac3fb3437068c2da57082aa76ff36997814b29aece92b588e43c74ea8e39eba1df0f0fb7eb1a99f5c91b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}