{
  "manageEntity": {
    "action": "Save",
    "entityId": "1011768",
    "entityType": "Track",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "1788185027766553449",
    "signature": "0xd512ca739f6ea2e9b13f395d280ca0ceb476d5ae70f5b164c2651497ca71ab7218714830047d78be18eda460d767c8638cc43de1380c9c411c7989ab610316141c",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "662047520"
  }
}