-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 03/27/2017 12:22 PM, Suhas Daftuar via bitcoin-dev wrote: > Eric Voskuil wrote: > >> Given the protocol requirements of the segwit proposal this is >> not the case. A miner running pre-segwit code will produce >> blocks that no segwit node will ever receive. > > The phrase "protocol requirements of segwit" is confusing here, > because there are two different layers that need consideration: > the consensus protocol layer and the peer-to-peer protocol layer. > But in neither layer is the behavior of not downloading blocks > from non-NODE WITNESS peers a "requirement". This is an > implementation detail in the Bitcoin Core code that alternate > implementations compliant with BIP 144 could implement > differently.
I agree, and thanks for the detailed clarification. Clearly it is possible for segwit blocks to be relayed. It is the implementation of Bitcoin Core (at least), in the absence of sufficient relay, that produces this outcome. > This is an implementation detail in the Bitcoin Core code that > alternate implementations compliant with BIP 144 could implement > differently. > > At the consensus layer, non-segwit blocks (described above) that > are valid to older nodes are also valid to segwit nodes. That > means that if a miner was using an older, pre-segwit version of > Bitcoin Core to produce blocks after segwit activates, that blocks > they find will be valid to all nodes. IOW Bitcoin Core has been implemented so that it will not see valid blocks announced by certain of its peers. Forcing it to see such blocks requires the p2p network work around its implementation. I agree that this is not inherent in the specifications for segwit, but it reads more like a bug than an "implementation detail" to me. e -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQEcBAEBCAAGBQJY2X3/AAoJEDzYwH8LXOFOez8H+wcmUkQnzqMlmBTQ/OqMO6q4 enLOX3H4UDa6gZdUxEDpszUvuca2ayukVYwIVo28BcjsTmQgxaxdrFTNTDYTRfe1 S2aX3Ftism0zuEIw8/KM2wcnNaHe9C5Q8TRmW7u6ZoLTJFwCkKWK1VEM9GFDePpT +HjtdviKt3s6NwiYhG+U+JawF+YDJvxyxcEj28bMFB1EW1kIAPA709oz2scZCPrc VroEUoFXFgMXBJaosKSVTUN3JE9pU9R1Mn7xVWwMEdU1IjeOeygHjdE/NfP7BJuU 05dWsH0be/xyNO76oFGhmwIyDogloQ9a5klEe7NetTDs1ieMD5j5oyr/qB79spw= =xkiV -----END PGP SIGNATURE----- _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
