{
  "manageEntity": {
    "action": "Save",
    "entityId": "1785325209",
    "entityType": "Track",
    "nonce": "0xe653d4b42c7e86ba1bdc4ffe646851dbdf1f61830fb59eadc16a5cb95f17b9b6",
    "signature": "0x4b87d2955e700f78c09d3b844bd6576b75c89d76e2730e6e79ca539a7ba31cfe3082d110e4945421c537e0e687ef58361c9918b02a835206ff73021a512d8e381c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}