{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa8d0f86b2d6f2cdc2f7d939f111b496ba6cf933fc1226b926a2451fc489af7e8",
    "signature": "0x49122200e0bcbe9a27d77775dc931413ad180a76222bb28492803a89bd446718287258e08d568b8f958be6bfe0e70ef8a560363679f1d7e1939952bd902798cb1c",
    "signer": "0xE4B0089aaFF065F7C7a0878A3DFaB65085783F85",
    "userId": "423251621"
  }
}