{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8813c7e2e139688401c6c543f4636879093f807c42c6a441deae0adddb8b2f4d",
    "signature": "0xabee7a1773489e5780cf4a7f381c3f33693660239a9a5ed7fd979bd6e0f3e0ca51f4da6cc9eafc6c9572f0cc3f8f17ec2d3c7a8d376a029e5fc9a9d24339185f1b",
    "signer": "0xff3C1dd8FF55065004dC3f4c1E8D6528fA839c4b",
    "userId": "774858683"
  }
}