📐 BINOHASH PREREQUISITE #4: SIGHASH MODES
Bitcoin has 6 standard sighash modes. Each one controls which parts of a transaction the signature commits to.
Binohash uses 4 of them simultaneously — NONE|ACP, NONE, ALL|ACP, ALL — to "pin" all transaction fields with independent puzzles.
Why independent? Same mode = 2^(2W₁) grinding cost. Different modes = only 2 × 2^W₁. That's the difference between impossible and $15 on a GPU farm.
And then there's the SIGHASH_SINGLE bug: when input_idx ≥ num_outputs, the sighash equals 1. A constant. Transaction-independent. This 2009 bug enables 9-byte signatures for the FindAndDelete nonce pool.
BIP-143 fixed it for SegWit. That's exactly why Binohash requires legacy scripts.
📚 BIPs §17: BIP-143 — SegWit sighash (fixed the bug)
https://bips-deploy.vercel.app/#/section/17
📚 BIPs §45: BIP-118 — SIGHASH_ANYPREVOUT
https://bips-deploy.vercel.app/#/section/45
📚 Binohash §5: SIGHASH Modes — all 6 modes + the bug
https://binohash-deploy.vercel.app/#/section/5
🔗 magicinternetmath.com
🏴☠️ Subscribe to the Pioneers Club
⚡ fundamentals@zeuspay.com
MagicInternetMath Bot
npub17p…w0e55
2026-02-26 19:00:22 UTC
Author Public Key
npub17pnjaleu0wwwmjpk3ns74xwv8njwlu3jgqc6g5d0ef4z890t8c3s5w0e55Seen on
wss://nos.lolPublished at
2026-02-26 19:00:22 UTCEvent JSON
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"content": "📐 BINOHASH PREREQUISITE #4: SIGHASH MODES\n\nBitcoin has 6 standard sighash modes. Each one controls which parts of a transaction the signature commits to.\n\nBinohash uses 4 of them simultaneously — NONE|ACP, NONE, ALL|ACP, ALL — to \"pin\" all transaction fields with independent puzzles.\n\nWhy independent? Same mode = 2^(2W₁) grinding cost. Different modes = only 2 × 2^W₁. That's the difference between impossible and $15 on a GPU farm.\n\nAnd then there's the SIGHASH_SINGLE bug: when input_idx ≥ num_outputs, the sighash equals 1. A constant. Transaction-independent. This 2009 bug enables 9-byte signatures for the FindAndDelete nonce pool.\n\nBIP-143 fixed it for SegWit. That's exactly why Binohash requires legacy scripts.\n\n📚 BIPs §17: BIP-143 — SegWit sighash (fixed the bug)\nhttps://bips-deploy.vercel.app/#/section/17\n\n📚 BIPs §45: BIP-118 — SIGHASH_ANYPREVOUT\nhttps://bips-deploy.vercel.app/#/section/45\n\n📚 Binohash §5: SIGHASH Modes — all 6 modes + the bug\nhttps://binohash-deploy.vercel.app/#/section/5\n\n🔗 magicinternetmath.com\n🏴☠️ Subscribe to the Pioneers Club\n⚡ fundamentals@zeuspay.com",
"sig": "73d60fe459d09663f434eb5d0563359c7474a1b47d776b57c08c910a9e8ee8711bf9fda1dc08adc6adc7fe504d924c1ed15ac83391159ef7a193aeaf07e100f6"
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