{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9cb12d82080b7e8f36248a456d8fa3f59af2105eb531ed6ddc699d292602cc49",
    "signature": "0xd9e204124ffe352d00fbfd7b5a0aa44daf5274fb9c503a80c9fa55051b48e3e57dcb086be4c5cd44ca5deb260b15e70e9048877290031924fece0130924b4bcf1b",
    "signer": "0x920c2f1256C66a42B0740694058F59A398EfD71C",
    "userId": "655200401"
  }
}