A sha256 hash is 32 bytes, but otherwise I agree with this proposal. Genesis block hash is the logical way to identify chains, moving forward. On Aug 9, 2015 7:12 AM, "Ross Nicoll via bitcoin-dev" < bitcoin-dev@lists.linuxfoundation.org> wrote:
> BIP 70 currently lists two networks, main and test (inferred as testnet3) > for payment protocol requests. This means that different testnets cannot be > supported trivially, and the protocol cannot be used for alternative coins > (or, lacks context to indicate which coin the request applies to, which is > particularly dangerous in cases where coins share address prefixes). > > I propose adding a new optional "genesis" field as a 16 byte sequence > containing the SHA-256 hash of the genesis block of the network the request > belongs to, uniquely identifying chains without any requirement for a > central registry. For backwards compatibility, the "network" field would > contain "main" for Bitcoin main net, "test" for Bitcoin testnet3, and > "other" for other networks apart from those two. > > I'd appreciate initial feedback on the idea, and if there's no major > objections I'll raise this as a BIP. > > Ross > > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev >
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