{
  "manageEntity": {
    "action": "Save",
    "entityId": "817151571",
    "entityType": "Track",
    "nonce": "0x40ea3098a6559b9b0c38ba5920880fcd01d9a56d2b179925bc6349c8145d4784",
    "signature": "0xb8d789f61184deaf6154c055649ac8401ff697f29d699007a67b33c56340700e6075bf7e2d514510997365351d2be396d8a6d11bb4e7398c3814cc6629cd26b41c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}