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Why does SHA-256d (double SHA-256) in Bitcoin have a constrained message schedule in the second hash?

Does SHA-256d's fixed second-hash padding create measurable internal structure beyond random oracle behavior?

where is bitcoind and bitcoin-cli

What factors make a location suitable for Bitcoin mining beyond low electricity cost?

Which RGB protocol version should I build on?

Which RGB protocol version should I build on? [closed]

What are the options for issuing tokens natively on Bitcoin without a sidechain?

What are the options for issuing tokens natively on Bitcoin without a sidechain? [closed]

I want to be rich immediately and get as much bitcoin on my wallet, how can I start to earn and how

I want to be rich immediately and get as much bitcoin on my wallet, how can I start to earn and how [duplicate]

estimatesmartfee differs a lot on testnet4

Was the OP_SUCCESSx reservation in BIP-342 designed with specific opcode families in mind, or as a generic forward-compatibility mechanism?

How Do I Verify Address Message Signature with Electrum?

Why did BIP-342 replace CHECKMULTISIG with a new opcode, instead of just removing FindAndDelete from it?

Does Silent Payments require the sender's input public key to be recoverable from the transaction?

Why does MuSig2 partial signature pass local verification but get rejected by Bitcoin Core mempool when using python-bitcoinutils?

Why does a MuSig2 partial signature pass local verification but get rejected by mempool — BIP341 double-tweak with python-bitcoinutils?

What does the BIP86 tweak guarantee in a MuSig2 Lightning channel, beyond address format?

Unable to push script bytes into a Script builder

Bitcoin, Global Conflict, and Mining Infrastructure [closed]

Bitcoin, Global Conflict, and Mining Infrastructure

Discrepancy in P2SH Redeem Script: Locktime encoding or padding issue (ab vs ad hash result)

Master XPUB exported from CC to Blue Wallet can't sign as Blue imports it as M44 while it's only M. Address used

Start9 LND hidden service not reachable externally via Tor — service onions unreachable but Start9 system onion works

I forked Bitcoin. It' Post-Quantum Proof. I figured out a way to honor old accounts

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