{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe25e8b56ce9c7ada8d26267f57155ff9aa221d714a9e134827772a0b8b09670f",
    "signature": "0x19c5202e69e3ec09cf2209b5fd40a4007b08b2d126d617d699b7060a9ffc81da684faa7e7e2259680aeb3c8b803bbf1e2b3fc3c957ca9be14a1a03c715ea8d6b1b",
    "signer": "0xaF7a388A5f241963CFe427661929Bb914004D8e0",
    "userId": "467003012"
  }
}