{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0a19fbcdfa1f1200730eee5b785aff515c7d0483a1f510cdc25e6f93e44dbaff",
    "signature": "0xb20d4e4f03cee0085c9b65f15f2e906def40f5309ee3160df9b7efdbb23ccc937e3668dbfb74969ad84f0c59b62d1f5cf9614440344aef01194dcfe390f533f91c",
    "signer": "0xC0c59008fCc0C97E2D828Af5487E16C46aFFd00e",
    "userId": "280265219"
  }
}