{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe70afdf786953cc3c04f0d4f41a59cbe4728f8b585574d9c7a47c1c5440351ca",
    "signature": "0x4d0854acf7f5214b11ac8792673f4836b2296100fa8f996c6ffa867baee693f752069a30c647adc7fa84e864d8eb978c807c41845d72752ac0e90641b8d789061c",
    "signer": "0xFD6ddCA27efe22c864359B250a6517CE5EeC3996",
    "userId": "590062714"
  }
}