{
  "manageEntity": {
    "action": "Save",
    "entityId": "580550791",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x105a4436ad9378b1b0bbfb90ec8bfd119a952d048a9f08a5bcbb970fb738e57f",
    "signature": "0x7d14dc1c630eb129b56b740d2dfb3d03def85b5ee63c4f3843ec25ffc4259e351415eada310116b401775266e2c3996b69906e0896ae52d793e94fe38bcb5abb1c",
    "signer": "0x02e15765C61eDed8E41cC3ECE6C97dEE0F691c98",
    "userId": "729344507"
  }
}