{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf6a971b89e34d0e1be4ca3cb8c9231d518942c744457ebda5ae51a71c08a40ad",
    "signature": "0x7cd4b168dab008f850a78ff341afbef74ce0aa4a58c925f1f28598610d1a3494119bf056e5aa9857e55c02d26849edc32f3a854be75ad3273ef45a412b06e0f01c",
    "signer": "0x607721fd390082C5978366eC53E04De2AfD5e74f",
    "userId": "844389450"
  }
}