Compare legacy, v0, and v1 transaction plans field by field and byte by byte.

Solana transaction v1 raises the maximum transaction size from 1,232 to 4,096 bytes. Transaction Diff explores a focused consumer use of that space while making the wire budget visible.

• Responsive monochrome product UI with deterministic payload generation
• Live UTF-8 byte meter, v1 fit estimate, and legacy transaction comparison
• Wallet Standard discovery and v1 capability reporting
• Copy and download flows with no server, account, analytics, or custody
• Dependency-free production build and Cloudflare Workers static configuration
• Product contract test, security headers, security policy, and architecture docs

This is a functional product prototype, not an audited transaction broadcaster. It intentionally stops at payload generation so users cannot mistake experimental sizing logic for a reviewed signing flow. Integrate the generated artifact with First or a reviewed @solana/kit >= 8 v1 sender.

npm test
npm run build
npm run dev

Open http://localhost:4173. To deploy after authenticating Wrangler, run npm run deploy.

• Use transaction version 1 to access the 4,096-byte ceiling.
• Set compute-unit and loaded-accounts-data-size limits explicitly; v1 defaults both to zero.
• Check supportedTransactionVersions.has(1) before asking a wallet to sign.
• Readers must set maxSupportedTransactionVersion: 1.
• Read sponsor and indexer limits from transactionConfig, not Compute Budget instructions.
• V1 supports 64 inline addresses, rejects duplicates, and does not use address lookup tables.

See docs/PRODUCT.md for product boundaries and extension points.

MIT

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Coding agents and LLM tooling can read this repo directly: AGENTS.md, llms.txt, llms-full.txt. Point an agent at https://github.com/nirholas/transaction-diff and it has the context it needs.

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