{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5f92a6c28559fff3e0a5b6aafa79f0d29948419a1fb328ac98cda47e8342c475",
    "signature": "0xef44b64d8b8c295f36114898e58a47bf04e97e72e4fa062c4881926556529e007c5bcdf19ff18c5337074e1fb0a1abd597f08c454f6a0decee860cbba68cc8f61b",
    "signer": "0x3df1D80c0836a5b2ae8fBb009AE9DE9A0C9f4fe2",
    "userId": "748290845"
  }
}