Subject: Re: [bitcoindev] Re: [BIP Proposal] Utreexo Nodes

From: K Calvin <[email-masked]>
Date: Wed, 30 Jul 2025 23:20:27 +0900

Hey Javier,

Thanks for taking the time to do the conceptual analysis.

As for the missing detail you mentioned, I think this section in the
validation BIP has that covered:
https://github.com/utreexo/biptreexo/blob/main/utreexo-validation-bip.md#order-of-operations

We wanted the accumulator BIP free from any Bitcoin related operations.
Thus anything that has to do with validation of Bitcoin blocks will be
found in the validation BIP.

Best,
Calvin

On Wed, Jul 30, 2025 at 6:22 PM Javier Mateos <[email-masked]>
wrote:

> Hi Calvin, Tadge, Davidson,
> Thanks for sharing this important work ...it's exciting to see Utreexo
> maturing into a full BIP proposal. The modular split into accumulator,
> validation, and P2P layers is very clean and helpful for review.
> After a quick conceptual and implementation-level analysis, I believe
> there's a critical detail missing from the current accumulator spec: a
> deterministic order for processing UTXO deletions and additions per block.
> Aside from that, the spec is well written and shows deep consideration.
> Best regards,
>
> El martes, 29 de julio de 2025 a las 20:26:42 UTC-3, Calvin Kim escribió:
>
>> Hello all,
>>
>> Tadge Dryja, Davidson Souza, and I would like to propose 3 BIPs
>> describing Utreexo, a consensus-compatible (non-soft fork) way to send and
>> verify transactions without storing the full UTXO set.
>>
>> The 3 BIPs are for:
>>
>>    1. The specification of the Utreexo accumulator.
>>    2. The specification of Bitcoin block and tx validation using the
>>    Utreexo accumulator.
>>    3. The peer to peer networking changes required to enable Utreexo
>>    nodes.
>>
>>
>> We are currently looking for conceptual review. Do note that the
>> documents are not final, and they will be updated.
>>
>> All of the BIPs can be found here: https://github.com/utreexo/biptreexo
>>
>> We thank you in advance for your time and consideration.
>>
>> Best,
>> Calvin
>>
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