{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2fb67b5c8ff638bdaaa553452db2787138c34291d789ad2b8401c1aa5f8ce6ac",
    "signature": "0x92ba95f171b8d857bfef1f32b46a285af9bd2bce816f454537a0b418616feb833a9bcd53dca2e0d3f7cd213b9d9969806e03c1b999bdb4691399667bd20b84331c",
    "signer": "0x27ae790B7aAcA244c689df0FE958D5431f1e4861",
    "userId": "669640444"
  }
}