Alt Coins for Bitcoin

Why SHOULD the funding tx consume BIP 141 inputs? In BOLT 02 we read that the funding TX should only consume segwit inputs . The sender: when creating the funding transaction: SHOULD use only BIP141 (Segregated Witness) inputs. What is the reason for that? If it was for preventing tx malleability it should be a MUST. Also I thought the inputs that are consumed don't matter for this context. https://ift.tt/2tGArJs

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Why is the privacy for using watch tower services increased with unpredictable commitment tx ids? In the open channel message in BOLT 02 the following statement is written about the various basepoints. The various _basepoint fields are used to derive unique keys as described in BOLT #3 for each commitment transaction. Varying these keys ensures that the transaction ID of each commitment transaction is unpredictable to an external observer, even if one commitment transaction is seen; this property is very useful for preserving privacy when outsourcing penalty transactions to third parties. I wonder about the last sentence. Why does this in particular help with the privacy of such services? I thought I increase privacy by using several third party watching services and not only one. In case I use one they would know my entire channel state history anyway. One thing that I guessed was that once I know one commitment tx I could calculate all txids for all possible channelstates. But ...

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I got sent funds but cannot get them I got sent funds but I do not have enough space on my computer to update bitcoin core and therefore the funds will not come is there anyway to cancel the transaction. The website I got the funds from said they cannot cancel so can I cancel. https://ift.tt/2EDgM3I

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What is so special about chacha20 stream cipher along with poly1305 for message authentication codes? I am currently trying to dissect the low level cryptography protocols of the lightning network and I realize that in many places chacha20 is being used. I tried reading about it in the Wikipedia Article there it says: This gives Salsa20 and ChaCha the unusual advantage that the user can efficiently seek to any position in the key stream in constant time. Salsa20 offers speeds of around 4–14 cycles per byte in software on modern x86 processors, and reasonable hardware performance. It is not patented, and Bernstein has written several public domain implementations optimized for common architectures. While I see the later parts about not being patented and optimzed for many architectures is nice I don't get the first sentence of the Quote. What does it mean that one can efficiently seek to any position in the key stream in constant time? https://ift.tt/2UbM6M0