{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x80fb4517ede2433d12ab5bb46504ed6e2c9c9b2f3e01fee4253fb575ce434f6e",
    "signature": "0x643bfec9fb181f101e5016a91ffb2715dd650c87237d7daa19aa20f3922f113c2d23a08ce1f956f514bbb48d6569cf63fae5838f3781b713e75f9187d9882aa61b",
    "signer": "0xf19F1fE26614a2184134C367B9Cab56C8Fc2c3f8",
    "userId": "152153675"
  }
}