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From: =?UTF-8?Q?Martin_Habov=C5=A1tiak?= <martin.habovstiak@gmail.com>
Date: Sun, 16 Feb 2025 09:50:08 +0100
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Subject: Re: [bitcoindev] Announcing Bitcoin BOSD: Standardized Withdrawal
 Output Specification for L2s
To: Jose Storopoli <jose@storopoli.io>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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Hi,

good idea and a nice crate! You'll hear from me soon regarding the Rust
side on your issue tracker.

Maybe you should reconsider the name. It's too similar to BSOD and myabe
you haerd taht if fisrt and lsat lteter in a wrod are the smae yuor brian
can dcedoe tehm anwyay. :)

Good luck!

Martin

D=C5=88a so 15. 2. 2025, 13:02 Jose Storopoli <jose@storopoli.io> nap=C3=AD=
sal(a):

>
> Dear Bitcoin Dev Community,
>
> I am excited to introduce Bitcoin BOSD (Bitcoin Output Script Descriptor)=
,
> a new specification and open source Rust implementation to simplify
> relay-safe (standardness-guarantee) on-chain withdrawals for Bitcoin Laye=
r
> 2 solutions.
>
> Key Features:
> - Standardness-by-construction for withdrawal outputs
> - Eliminates ad-hoc standardness rule implementations in L2s
> - Compact representation
>
> Problem Solved:
> L2 operators currently risk being unable to process withdrawals if users
> request non-standard transactions (e.g., oversized OP_RETURN). BOSD ensur=
es
> outputs are correct-by-construction according to Bitcoin network's
> standardness rules, abstracting away complex validation logic.
>
> Available on crates.io <https://crates.io/crates/bitcoin-bosd>
>
> Get Involved:
> Detailed Specification and Motivation/Rationale: SPECIFICATION.md
> <https://github.com/alpenlabs/bitcoin-bosd/blob/main/SPECIFICATION.md>
> Repository: github.com/alpenlabs/bitcoin-bosd
> Feedback welcome via GitHub Issues and Discussion; or the mailing list.
>
> This work emerged from practical challenges faced by myself and Trey Del
> Bonis (GitHub @delbonis) at Alpen Labs, while building validation logic f=
or
> processing L2 withdrawals on-chain for Strata: a Bitcoin-native BitVM-bas=
ed
> bridge to a ZK-rollup. We believe standardization in this domain will
> benefit the entire ecosystem by reducing fragmentation and improving
> interoperability.
> The specification is has a CC0 public domain license, and the Rust
> implementation is MIT/Apache-2.0 double licensed.
>
> The structure of a BOSD consists of:
>
> - 1-byte tag representing a type ID.
> - Arbitrary-length cryptographic payload (although practically bounded to
> like
>   80 bytes).
>
> Here's a table for the supported outputs. Also note that we can trivially
> extend it by adding more prefixes using the type it byte.
>
> ```
> | Type | Payload Length(s) | Payload Interpretation | Spend Type    |
> Mainnet Address Prefix |
> | ---- | ----------------- | ---------------------- | ------------- |
> ---------------------- |
> | 0    | ..=3D80             | `OP_RETURN` payload    | (N/A)         |
> (N/A)                  |
> | 1    | 20                | pubkey hash            | P2PKH         |
> `1...`                 |
> | 2    | 20                | script hash            | P2SH          |
> `3...`                 |
> | 3    | 20, 32            | SegWit v0 hash         | P2WPKH, P2WSH |
> `bc1q...`              |
> | 4    | 32                | SegWit v1 public key   | P2TR          |
> `bc1p...`              |
> ```
>
> Since we strived for compact representation both in-memory and also
> over-the-wire, BOSD does not support checksums or any native error
> correction.
>
> PS: Technically Strata is not a defect L2, since it is a 1-of-N
> trust-minimized bridge, and not a fully trustless bridge.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Bitcoin Development Mailing List" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to bitcoindev+unsubscribe@googlegroups.com.
> To view this discussion visit
> https://groups.google.com/d/msgid/bitcoindev/94ac8f66-1627-4526-bb34-0953=
61a30fb4n%40googlegroups.com
> <https://groups.google.com/d/msgid/bitcoindev/94ac8f66-1627-4526-bb34-095=
361a30fb4n%40googlegroups.com?utm_medium=3Demail&utm_source=3Dfooter>
> .
>

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<div dir=3D"auto">Hi,<div dir=3D"auto"><br></div><div dir=3D"auto">good ide=
a and a nice crate! You&#39;ll hear from me soon regarding the Rust side on=
 your issue tracker.</div><div dir=3D"auto"><br></div><div dir=3D"auto">May=
be you should reconsider the name. It&#39;s too similar to BSOD and myabe y=
ou haerd taht if fisrt and lsat lteter in a wrod are the smae yuor brian ca=
n dcedoe tehm anwyay. :)</div><div dir=3D"auto"><br></div><div dir=3D"auto"=
>Good luck!</div><div dir=3D"auto"><br></div><div dir=3D"auto">Martin</div>=
</div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr"=
 class=3D"gmail_attr">D=C5=88a so 15. 2. 2025, 13:02 Jose Storopoli &lt;<a =
href=3D"mailto:jose@storopoli.io">jose@storopoli.io</a>&gt; nap=C3=ADsal(a)=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bor=
der-left:1px #ccc solid;padding-left:1ex"><br>Dear Bitcoin Dev Community, <=
br><br>I am excited to introduce Bitcoin BOSD (Bitcoin Output Script Descri=
ptor), a new specification and open source Rust implementation to simplify =
relay-safe (standardness-guarantee) on-chain withdrawals for Bitcoin Layer =
2 solutions.<br><br>Key Features:<div>- Standardness-by-construction for wi=
thdrawal outputs <br>- Eliminates ad-hoc standardness rule implementations =
in L2s <br>- Compact representation<br><br>Problem Solved:<br>L2 operators =
currently risk being unable to process withdrawals if users request non-sta=
ndard transactions (e.g., oversized OP_RETURN). BOSD ensures outputs are co=
rrect-by-construction according to Bitcoin network&#39;s standardness rules=
, abstracting away complex validation logic.<br><br>Available on <a href=3D=
"https://crates.io/crates/bitcoin-bosd" target=3D"_blank" rel=3D"noreferrer=
">crates.io</a><br><br>Get Involved:</div><div>Detailed Specification and M=
otivation/Rationale: <a href=3D"https://github.com/alpenlabs/bitcoin-bosd/b=
lob/main/SPECIFICATION.md" target=3D"_blank" rel=3D"noreferrer">SPECIFICATI=
ON.md</a><br>Repository: <a href=3D"https://github.com/alpenlabs/bitcoin-bo=
sd" target=3D"_blank" rel=3D"noreferrer">github.com/alpenlabs/bitcoin-bosd<=
/a><br>Feedback welcome via GitHub Issues and Discussion; or the mailing li=
st.=C2=A0<br><br>This work emerged from practical challenges faced by mysel=
f and Trey Del Bonis (GitHub @delbonis) at Alpen Labs, while building valid=
ation logic for processing L2 withdrawals on-chain for Strata: a Bitcoin-na=
tive BitVM-based bridge to a ZK-rollup. We believe standardization in this =
domain will benefit the entire ecosystem by reducing fragmentation and impr=
oving interoperability.</div><div>The specification is has a CC0 public dom=
ain license, and the Rust implementation is MIT/Apache-2.0 double licensed.=
</div><div><br></div><div>The structure of a BOSD consists of:<br><br>- 1-b=
yte tag representing a type ID.<br>- Arbitrary-length cryptographic payload=
 (although practically bounded to like<br>=C2=A0 80 bytes).<br></div><div><=
br></div><div>Here&#39;s a table for the supported outputs. Also note that =
we can trivially extend it by adding more prefixes using the type it byte.<=
/div><div><br></div><div>```</div><div>| Type | Payload Length(s) | Payload=
 Interpretation | Spend Type =C2=A0 =C2=A0| Mainnet Address Prefix |<br>| -=
--- | ----------------- | ---------------------- | ------------- | --------=
-------------- |<br>| 0 =C2=A0 =C2=A0| ..=3D80 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 | `OP_RETURN` payload =C2=A0 =C2=A0| (N/A) =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 | (N/A) =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|<br>| 1 =C2=A0 =C2=A0| 20 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0| pubkey hash =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| P2PKH=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | `1...` =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |<br>| 2 =C2=A0 =C2=A0| 20 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0| script hash =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0| P2SH =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| `3...` =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |<br>| 3 =C2=A0 =C2=A0| 20, 32 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| SegWit v0 hash =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 | P2WPKH, P2WSH | `bc1q...` =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|<br>| 4 =C2=A0 =C2=A0| 32 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0| SegWit v1 public key =C2=A0 | P2TR =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0| `bc1p...` =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|<br></div><div>```</div><div><br></div><div>Since we strived for compac=
t representation both in-memory and also over-the-wire, BOSD does not suppo=
rt checksums or any native error correction.</div><div><br></div><div>PS: T=
echnically Strata is not a defect L2, since it is a 1-of-N trust-minimized =
bridge, and not a fully trustless bridge.</div>

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