{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd84f231e9df71a9d957f5ccb7ee45b4bb2982e5f8e0403fb7bc7e6f61ccebff9",
    "signature": "0x1f2be9acbdaade6f500a75349fafeb9ed295a71ec11f366ffbc370d3457aa2050efe4eabf2099af10e581542004283c99ff512a1f384a96163e87c5ef5c5e8e61b",
    "signer": "0xEF6cD0Af3a27bd0551306E2C07d9eeA9E8f8fd64",
    "userId": "801861717"
  }
}