{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0502542eadb9624f3d184438037c9f5c81e4be3602c5b998cfea61176fdec2af",
    "signature": "0xe04da5f11ec7b459de181f81b2331643e44c16f80157cd1b7aec916c821fc3fc2c6113460c7efacb6b0a8c1961b6538be58fe15b42b69bb2ab5a8dcd2e6bf8b61b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}