{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xcd004a617eba5e15ff6ce6fa2a25300c7d0a5f6927685439f9935a0b95b08760",
    "signature": "0x997244f451d86efe144837c9d59326e17ca4af9968d5b04c5086f0c062c617b21eacfd781aaca6b7a622585495f179bf5eb4bef247f6fd3992c1e3dabb2ae6131b",
    "signer": "0x4ac23dCFa73270D0cdFeE7D7409959255f83fac5",
    "userId": "21603383"
  }
}