{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x303f9c58e0c80152013a45628b2a77f98fa10b89979e0d8f5fe9c477ffb491ec",
    "signature": "0xd0e27e9522154b4197a5e98ff1004919fb7941f0436a5d94fc00084c326d29ca7929c7d436b5775d3f113ab91f4e318175a02c9c9b539588acda1beb65bb841b1b",
    "signer": "0x537FeA657eFcF11815a94831D95e49f18F0250FB",
    "userId": "870901302"
  }
}