{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x49f603f85aa2dd7a004457a5f8532977566b0649a54e3f6302338ea58e4f7f5f",
    "signature": "0x528486938cf89956b083783d65524096e079395a6e9dacfee200c75ea0ef3784747a089f9e5045a21e2feca383b681b629394a377da936b8ab6edec0612a5ab21c",
    "signer": "0x80AC38525e432888f1bE1e2e6DDffB956029985E",
    "userId": "523003328"
  }
}