{
  "manageEntity": {
    "action": "Save",
    "entityId": "251948311",
    "entityType": "Track",
    "nonce": "0x0f52d07089abf977a8fd95bef542a2ab0d5b2ae1219e67e5a617312ff7af4ecc",
    "signature": "0x4e3cfc3c98fce71b06727e714cc313517e39fdef35be7480f6fa77618ed7d79e23dfbeb2d3411fa742e435db986569a6fc13c881c397acb3cbe8124c0f49fe6b1b",
    "signer": "0x87FC3581f96D45b347BB39E15f25079950C5Cc27",
    "userId": "339826419"
  }
}