{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x53266351105bd7eea1fc69f9b3e0e493e71dc32927a0d3b1de9ff8eeddcbb17f",
    "signature": "0x317c997d6d25e377ee65a3066e55ee01d09022383f23a97385f19f370b7053383f8053c1acca4c747a48902d6583a7b2e427ee12e630d7ac994e5be5e067fb0b1c",
    "signer": "0x3f2bE9B463aF957B402B3F55366C97F142ce7352",
    "userId": "663004641"
  }
}