Can a transaction that has been signed and broadcast to the mempool be intercepted if it uses the sighash NONE|ANYONECANPAY?

Example:

Alice creates a PSBT and signs her input using the SIGHASH_NONE | SIGHASH_ANYONECANPAY flag. She then passes this transaction to Bob. Bob adds his own input and output and signs them with the SIGHASH_ALL flag.

Question:

Is it correct to say that John or any other participant in the network could intercept this transaction in the mempool and use Alice’s input for their own purposes?



from Recent Questions - Bitcoin Stack Exchange https://ift.tt/I2VnPo3
via IFTTT

Popular posts from this blog

Bitwise Clients Pour $69M Into Solana as Bulls Fight to Reclaim $200 Resistance Zone

Image
Institutional confidence in Solana (SOL) continues to surge as Bitwise clients invest a massive $69.5 million, supporting the blockchain as a frontrunner among alternative Layer-1 assets. The investment shows a growing appetite for scalable, low-cost blockchain solutions beyond Bitcoin and Ethereum. Solana has been one of 2025’s standout performers, supported by its lightning-fast transaction speeds, affordable fees, and expanding DeFi and Web3 ecosystems. The Bitwise allocation signals institutional validation of Solana’s infrastructure and future potential, particularly as adoption accelerates tokenized asset markets. On-chain metrics reveal heightened activity, transaction volumes, developer participation, and staking inflows are all climbing. This combination of technological strength and real-world integration reinforces investor optimism, even as short-term volatility tests the $200 resistance level. Bitwise Expands Its Institutional Crypto Strategy Bitwise Asset Management’...
Read more

The XRP Roadmap: Ripple President Reveals The Next Big Steps

Image
As Ripple expands its offerings and operations to broader markets, the crypto company’s President, Monica Long, has unveiled its next phases of growth that could set the stage for a new era for XRP. The suggested roadmap points toward expanded innovation, deeper institutional adoption, and a broader role for the XRP Ledger (XRPL) in the global financial sector. Ripple’s President Outlines Next Chapter For XRP At the Ripple Swell 2025 event, held on November 4-5, Long shared the company’s ambitious roadmap for XRP , giving the crypto community a glimpse of Ripple’s future ecosystem plans. Speaking with CoinDesk, she explained that Ripple’s vision extends well beyond payments, focusing on developing a robust infrastructure that promotes financial inclusion globally.  According to the Ripple President, the crypto payments company now runs two main parts of its business. One division focuses on helping financial institutions adopt digital assets , while the other is dedicated to ...
Read more

How to compute MAST commit bytes in bitcoin payment?

Image
The hash digests used to create the commitments are each 32 bytes, so proving that a spend of Figure 7-6 is authorized (using a merkle tree and the particular conditions) and authenticated (using signatures) uses 383 bytes. By comparison, the same spend without a merkle tree (i.e., providing all possible authorization conditions) uses 412 bytes. Can anyone explain how to compute 383 bytes and 412 bytes? Thanks! from Recent Questions - Bitcoin Stack Exchange https://ift.tt/M2lri0K via IFTTT
Read more