# Custom StreamingCallbackToken

**URL:** <https://forum.dfinity.org/t/custom-streamingcallbacktoken/9379>\
**Category:** Developers\
**Created:** [December 6, 2021, 10:43pm UTC](https://forum.dfinity.org/t/custom-streamingcallbacktoken/9379 "2021-12-06T22:43:20Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![jzxchiang](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/jzxchiang/32/2592_2.png) [@jzxchiang](https://forum.dfinity.org/u/jzxchiang)\
**Post date:** [December 7, 2021, 7:36am UTC](https://forum.dfinity.org/t/custom-streamingcallbacktoken/9379/7 "2021-12-07T07:36:22Z")

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Yeah the boundary nodes run icx-proxy. I believe it _may_ have recently been open sourced, see [this](https://forum.dfinity.org/t/boundary-nodes-source-code/7203) for details.

The real question is are the boundary nodes decentralized, i.e. managed by the NNS and thus upgradable via NNS proposals. And I think the answer is no… hoping to get more clarity on this [here](https://forum.dfinity.org/t/long-term-r-d-boundary-nodes-proposal/9401).

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