bitcoinblake-coinsplitter

A small, dependency-free Python utility that constructs an unsigned Bitcoin PSBT containing a deliberately oversized OP_RETURN output. It never handles private keys, signs transactions, or broadcasts transactions.

Important

This is experimental software. Independently verify the current consensus and mempool rules on both Bitcoin and Bitcoin Blake before using it with funds. Review every generated PSBT in a trusted signer and test the final transaction with Bitcoin Core's testmempoolaccept before broadcasting.

The embedded marker is 96 bytes of project-specific binary data. Including the push opcode, the marker script is 99 bytes. The marker is public and makes transactions created by this release recognizable as belonging to this tool. It is intentionally unrelated to markers used by earlier tools, but that does not guarantee transaction privacy: reused addresses, common inputs, amounts, output ordering, fee choice, and broadcast timing can all link transactions.

Requirements

• Python 3.10 or newer
• A native SegWit P2WPKH input
• A fresh P2WPKH, P2WSH, or P2TR destination address

Usage

python bitcoinblake_coinsplitter.py

The program asks for a complete raw parent transaction, its output index, a fresh destination address, and a fee rate. After confirmation it writes:

• unsigned_transaction.txt
• transaction.psbt
• transaction_psbt_base64.txt

These generated files are excluded by .gitignore.

Privacy

Do not reuse the source address or destination address. For stronger separation from previous activity, also avoid shared inputs, distinctive round amounts, identical fee rates, and closely correlated broadcast times. Publishing this repository necessarily makes its new marker attributable to this project.

License

MIT