{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x953efc9708e75c5f8ca40b698398863e7af0ccc2ea667da5ccc78f865762d95c",
    "signature": "0x9d3fab3f1e45039c4257e448b685c6daadc582979b82a14c6a3a635ca3911e705d03fbe41a1baf88f140cec44bbfd606f2313246b42c169e57bee216e3dfe3b41b",
    "signer": "0x9AC1C4307292501c693bF6378F6E04B88640554c",
    "userId": "674646578"
  }
}