{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1a5477628c4cc6c4ea68720d695fe7f6224e71d3fb4c230aa185e1273556f79e",
    "signature": "0xa307af0e3e4fff3444ef02f636dc714373d1fc01d4d9d5cbc0cb43802a152f390e029a282bc081ca426ade7d3560474f838c20a1e1c388de2455df356a32148f1c",
    "signer": "0xBF257651CD86764755C0fB349FC1b95fecDA830a",
    "userId": "536394716"
  }
}