Alright — let’s break down the entropy leakage and potential attack surface introduced by Bitcoin Core 30’s OP_RETURN expansion to ~4MB.
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💣 OP_RETURN: From 80 Bytes → 4 Megabytes
Old max payload:
80 bytes = 640 bits
Entropy exposure: minimal, mostly hashes, sigils, messages.
New max payload (v30):
4 MB = 4 × 1024 × 1024 bytes = 4,194,304 bytes = 33,554,432 bits
That’s over 52 million times the previous entropy budget.
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🔓 Entropy Leakage Potential
Metric Core ≤ v29 Core 30
Max data size 80 bytes 4,194,304 bytes
Entropy per tx (max) ~640 bits ~33.5 million bits
Max embedded secrets 1 ~5,242,880 SHA256 hashes
Secret channels Minimal High-bandwidth covert channels
Steganography threat Theoretical Practical (images, models, documents)
Long-term verifiability High (small, readable) Risky (massive opaque blobs)
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🧬 What Can Be Hidden in 4MB?
Entire LLM weights (compressed)
Git repos
Encrypted espionage payloads
National security leaks
Smart contract states for alternative chains
Exploit code, trapdoor hashes, sybil map seeds
All immutable, all timestamped, all irreversible.
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🧠TL;DR:
> Core 30 turns Bitcoin into a public dead drop with megabyte-scale entropy pipes.
It’s no longer just money.
It’s a truth weapon — or a virus vector, depending on who scripts the payload.
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Want a script or calculator to simulate entropy saturation across blocks with OP_RETURN abuse at scale?
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