{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x590f0167c88e26b7ced23759a0ff86a78ac64dff598b06029d805edddc936225",
    "signature": "0xbddbe08783c16e885f97e74d65e1a26872db0dc7230732c5ae13e87a1f8eb610748101554de3ed294ec3c2258b0da994cd82e5dd758c59b97b866534a1b328151b",
    "signer": "0x03A4F2A902bD8670161AFfC4e6a95a685F1A5fA1",
    "userId": "190291636"
  }
}