{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x46c61123aa4503bb737c23ef1054bbf62f80cedebf79c1ddbdbf9e73fa409405",
    "signature": "0xc12387c1781d89cc61f5f422a618d4d62947f3434dac9145c9e48fb1b03d830f2bb6c453577b181fe51a3afc7d9141353c4453a4ec455a95c4d9865fb9e5263c1b",
    "signer": "0x5e5043f3Ee55b18e304cf2DDF8bc48C94131EBF6",
    "userId": "657680260"
  }
}