{
  "manageEntity": {
    "action": "Save",
    "entityId": "641782698",
    "entityType": "Track",
    "nonce": "0x89e6f8d4990e6780dc4333e69621fec7cb9522aad16df823dca690350712ce60",
    "signature": "0xf33aa38f086df2812c6936b0c19deec7457d5ff2462802d1b064ff8bce34147237f63c8397d07476f72b0ad71a923a6135c71e314faf406a96eb84ac17613b2f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}