{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb7edd74dcffc4cf3d4374f983ed04560af00b121831ed7300aed0675cac51daa",
    "signature": "0x6537d0de6648f7338a27e12105c1f29b80a20a8706962962f403a3e30f753cc014b994d6e333c3fa4487e1721d4d9773a92d71e980a7aa7195b2c8a9a61e9e3c1b",
    "signer": "0x9b751fABFcb2A9E8e312B547Becca1C8812efc97",
    "userId": "378692055"
  }
}