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You are correct that effectively Bitcoin PoW involves computing the Merkle root every now and then in addition to the hash grinding. However, this is negligable. Even ignoring nTime rolling, the Merkke root computation is just a dozen or so hashes every 232. It's so little because not the entire Merkle tree needs recomputation; just the coinbase transaction ...


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with the current system it seems impossible to do so. The most probable protocol change / update will be after activating BIP Schnorr, when we have the chance to move away from payment_hash/preimage and can go to payment_point/secret_scalar. Once we achieved this htlc's can be exchanged by adoptor signatures as described in this tutorial. Those would ...


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Here is a link[https://docs.google.com/viewer?url=https%3A%2F%2Fwww.eyeboot.com%2Fdownload%2FTTBIT%2FTTBIT-SHA256-USB-Miner-Setup-Guide.pdf] That was what i used to set mine up


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