{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x579e36ba34f6cd9d6d1732ed0fb6f56822056ee243a8cec13df4540b9a322b55",
    "signature": "0xf5ae8eb6b5ab2765adb924cdb40347997648fb226e1fb5460e5aa3856cddafed784ab18494e9d78fa3be8ddacb8e46b3100d3ca11df72e4087f29add4a0a2e371b",
    "signer": "0x9992190b899BAd1Aa34491C3c24e678200638202",
    "userId": "159384638"
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}