{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7dd3ca484fdf4bc79e99867e36bf6d710a3cde50e3e47db3dba23f5f926eb42f",
    "signature": "0xa4f6c23a4d560e686666163d82f76f84bcfc5fd33648da604755e5da2f5bdf303b499f9d8497bac478780f83b4eb82c1c1c5d8d4ba902ecb9f3aeaa1155168dd1c",
    "signer": "0x743D80D1b44492C339EA085e60300F7634dFB472",
    "userId": "305157132"
  }
}