{
  "manageEntity": {
    "action": "Save",
    "entityId": "1231983901",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb451e36b37e7261ec440acf959d2d0b9659cb30a3e7e45f53273e07717322eae",
    "signature": "0xe8846d23cedfa906913940970304d839f1c573af21f81e58863927d63008449c7636e6153cbe64dcc3e77e3a9c5d2e8bca22cdca60af8abe1c336049f9430cc31c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}