Re: [bitcoindev] Announcing Bitcoin BOSD: Standardized Withdrawal Output Specification for L2s

["Martin Habovštiak" <martin.habovstiak@gmail.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

Dňa so 15. 2. 2025, 13:02 Jose Storopoli <jose@storopoli.io> napísal(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 Layer
> 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 ensures
> 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 for
> processing L2 withdrawals on-chain for Strata: a Bitcoin-native BitVM-based
> 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    | ..=80             | `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.
>
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