{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4fbf0ce212f9b1c2cc70b4cb14f1b54f0a58b9b40c0258d3262112dcc024128c",
    "signature": "0x7c2a3f2ebd24324e21921bf0581e70d969597ef6f2935fcd93373489602ef54273d717d3c4d555028e94052c4b0eb6a40ee9b0aca63e248106127548b06068931b",
    "signer": "0x78A1B4FE632CeaAccC76a4e01ea2D766006B9d67",
    "userId": "302800823"
  }
}