{"action":"created","comment":{"url":"https://api.github.com/repos/NebulousLabs/Sia/pulls/comments/54379161","id":54379161,"diff_hunk":"@@ -13,6 +13,10 @@ import (\n \t\"github.com/NebulousLabs/Sia/encoding\"\n )\n \n+const (\n+\tBlockHeaderSize = 80 // 32 (ParentID) + 8 (Nonce) + 8 (Timestamp) + 32 (MerkleRoot)","path":"types/block.go","position":5,"original_position":5,"commit_id":"65afa8fa52c6fe7ef84b1dbc164b76da484e9f68","original_commit_id":"65afa8fa52c6fe7ef84b1dbc164b76da484e9f68","user":{"login":"DavidVorick","id":2316841,"avatar_url":"https://avatars.githubusercontent.com/u/2316841?v=3","gravatar_id":"","url":"https://api.github.com/users/DavidVorick","html_url":"https://github.com/DavidVorick","followers_url":"https://api.github.com/users/DavidVorick/followers","following_url":"https://api.github.com/users/DavidVorick/following{/other_user}","gists_url":"https://api.github.com/users/DavidVorick/gists{/gist_id}","starred_url":"https://api.github.com/users/DavidVorick/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DavidVorick/subscriptions","organizations_url":"https://api.github.com/users/DavidVorick/orgs","repos_url":"https://api.github.com/users/DavidVorick/repos","events_url":"https://api.github.com/users/DavidVorick/events{/privacy}","received_events_url":"https://api.github.com/users/DavidVorick/received_events","type":"User","site_admin":false},"body":"needs a docstring","created_at":"2016-02-29T08:20:36Z","updated_at":"2016-02-29T08:20:36Z","html_url":"https://github.com/NebulousLabs/Sia/pull/992#discussion_r54379161","pull_request_url":"https://api.github.com/repos/NebulousLabs/Sia/pulls/992","_links":{"self":{"href":"https://api.github.com/repos/NebulousLabs/Sia/pulls/comments/54379161"},"html":{"href":"https://github.com/NebulousLabs/Sia/pull/992#discussion_r54379161"},"pull_request":{"href":"https://api.github.com/repos/NebulousLabs/Sia/pulls/992"}}},"pull_request":{"url":"https://api.github.com/repos/NebulousLabs/Sia/pulls/992","id":60559736,"html_url":"https://github.com/NebulousLabs/Sia/pull/992","diff_url":"https://github.com/NebulousLabs/Sia/pull/992.diff","patch_url":"https://github.com/NebulousLabs/Sia/pull/992.patch","issue_url":"https://api.github.com/repos/NebulousLabs/Sia/issues/992","number":992,"state":"open","locked":false,"title":"Header flooding","user":{"login":"VoidingWarranties","id":5420909,"avatar_url":"https://avatars.githubusercontent.com/u/5420909?v=3","gravatar_id":"","url":"https://api.github.com/users/VoidingWarranties","html_url":"https://github.com/VoidingWarranties","followers_url":"https://api.github.com/users/VoidingWarranties/followers","following_url":"https://api.github.com/users/VoidingWarranties/following{/other_user}","gists_url":"https://api.github.com/users/VoidingWarranties/gists{/gist_id}","starred_url":"https://api.github.com/users/VoidingWarranties/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/VoidingWarranties/subscriptions","organizations_url":"https://api.github.com/users/VoidingWarranties/orgs","repos_url":"https://api.github.com/users/VoidingWarranties/repos","events_url":"https://api.github.com/users/VoidingWarranties/events{/privacy}","received_events_url":"https://api.github.com/users/VoidingWarranties/received_events","type":"User","site_admin":false},"body":"This PR implements header broadcasting.\r\n\r\nI tried to keep the changes to existing consensus code as minimal as possible. The only real changes to existing code should be:\r\n* `validateHeader` renamed to `validateHeaderAndBlock`\r\n* `AcceptBlock` and `threadedReceiveBlocks` broadcast blocks to some peers and headers to others, depending on their versions.\r\n\r\nEverything else is new code and only deals with header broadcasting.\r\n\r\n`RelayHeader` RPC mirrors the `RelayBlock` RPC used for block flooding. Every call to `RelayBlock` is also replaced with a branching broadcast that broadcasts `RelayHeader` to new peers (v0.5.2 and newer) and `RelayBlock` to old peers.\r\n\r\n`managedAcceptHeader` mirrors `managedAcceptBlock` and does all of the header validation. However, unlike its counterpart, it cannot accept anything into the blockchain as it does not have the block and header-first blockchain downloads haven't been implemented yet. Instead, it returns `nil` if the header is valid. It is then up to the caller of `managedAcceptHeader` ( `RelayHeader`) to download the block and call either `managedAcceptBlock` or `AcceptBlock` on it.\r\n\r\n`Send1Blk` is analogous to `SendBlocks`, but for just one block. It is used to download a block corresponding to a validated block header. Peers can request blocks from other peers by the block id. The requesting peer then calls `AcceptBlock` on the received block.\r\n\r\nI tried to keep the commits clean and separated, so going through the diffs commit by commit should be 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