{
  "manageEntity": {
    "action": "Save",
    "entityId": "21345542",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x18e1f2219a09cc44950dc27cdbf8384bd791d3443f253acd7a917b4cbdd75803",
    "signature": "0x87c6fc8e5fe3498a8b6bfa7bce3c0313fd1408facaad7a97abd956a72ee3f74565b91b8cf93c258a45c913ade4d5b2629649c47f1c4a0a67c76002614f6695681c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}