{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd38b9757f6d5349f3f39826f14f8db90d871c0990126f9cdf12bddc82927f276",
    "signature": "0xca866d1b900bb4ad828d13fb435865ee15322c7b3c8e9d98b6efad1688ede15754230163be38238113ecf7485ca88d03062196f618fe973aec0618cd1e1b31761b",
    "signer": "0xC4Ae97334FDe4781B569055a7972392eaFa7B0F3",
    "userId": "41565287"
  }
}