{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3416206970c37647d609d2cce9bf3fe997cf17cacc3e286bbb9b8dbfa11b804f",
    "signature": "0x2cdb9596042d744d2eb5548666eed2b039eaba443dceec15950a671f1809321144f6661bbc542cdfff61e5a434d4068fe5e6c1563d94ba62d0182c4deffc23091b",
    "signer": "0xdCaB4F12C4AddB1c7eA4531c9B8e62e393CdD2DC",
    "userId": "77868222"
  }
}