bitcoind 是否在每次啟動時驗證每個塊？

執行 bitcoind 時，它開始下載區塊鏈並連續驗證每個塊。它將區塊鏈儲存在~/.bitcoin/blocks目錄中。當我們中斷守護程序並重新啟動它時，從上次執行下載的最後一個塊開始下載，而不是再次從第一個塊開始下載。這是我從日誌中了解到的。

2022-06-11T16:51:56Z dnsseed thread start
2022-06-11T16:51:56Z addcon thread start
2022-06-11T16:51:56Z init message: Done loading
2022-06-11T16:51:56Z opencon thread start
2022-06-11T16:51:56Z msghand thread start
2022-06-11T16:51:56Z Waiting 300 seconds before querying DNS seeds.
2022-06-11T16:51:57Z New outbound peer connected: version: 70016, blocks=740373, peer=0 (outbound-full-relay)
2022-06-11T16:51:58Z Synchronizing blockheaders, height: 740373 (~100.00%)
2022-06-11T16:51:59Z UpdateTip: new best=0000000000000533f02f775db4176ec57012c76c6dc56fa3debf5f307da3d758 height=139238 version=0x00000001 log2_work=65.854192 tx=1188914 date='2011-08-02T05:59:57Z' progress=0.001607 cache=0.0MiB(308txo)
2022-06-11T16:51:59Z UpdateTip: new best=0000000000000264f2835263bdfcae0a8a4185b781fa980d0eae3e88ee4effa9 height=139239 version=0x00000001 log2_work=65.854368 tx=1189040 date='2011-08-02T06:01:53Z' progress=0.001607 cache=0.1MiB(621txo)
2022-06-11T16:51:59Z UpdateTip: new best=00000000000008ae748a17911f5d56ac7e5ede06586d98d7d6aa83ce8bda5237 height=139240 version=0x00000001 log2_work=65.854543 tx=1189100 date='2011-08-02T06:11:42Z' progress=0.001607 cache=0.1MiB(793txo)

如上日誌所示，它是從139238高度下載的。但是除了下載之外，它是否再次驗證下載的塊？在使用 逐步執行程序時，我注意到它從第一個塊gdb呼叫。GetBlockProof

(gdb) break GetBlockProof
Breakpoint 1 at 0x31be40: file chain.cpp, line 126.
(gdb) run
Starting program: /usr/local/bin/bitcoind 
Missing separate debuginfos, use: dnf debuginfo-install glibc-2.31-2.fc32.x86_64
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
2022-06-11T16:58:20Z Bitcoin Core version v23.0 (release build)
2022-06-11T16:58:20Z Assuming ancestors of block 000000000000000000052d314a259755ca65944e68df6b12a067ea8f1f5a7091 have valid signatures.

...

Thread 1 "bitcoind" hit Breakpoint 1, GetBlockProof (block=...) at chain.cpp:126
126 {
Missing separate debuginfos, use: dnf debuginfo-install libevent-2.1.8-8.fc32.x86_64 libgcc-10.3.1-1.fc32.x86_64 openssl-libs-1.1.1d-7.fc32.x86_64 zlib-1.2.11-21.fc32.x86_64
(gdb) p block.nHeight 
$1 = 0
(gdb) continue 
Continuing.

Thread 1 "bitcoind" hit Breakpoint 1, GetBlockProof (block=...) at chain.cpp:126
126 {
(gdb) p block.nHeight 
$2 = 1
(gdb) continue 
Continuing.

Thread 1 "bitcoind" hit Breakpoint 1, GetBlockProof (block=...) at chain.cpp:126
126 {
(gdb) p block.nHeight 
$3 = 2
(gdb) 

從創世區塊開始驗證區塊是真的嗎？還是我的結論是錯誤的？如果不是，為什麼GetBlockProof從第一個塊呼叫？

IIRC，它驗證它獲得的最佳標頭鏈，並查看該鍊是否確實是其同行所知道的最佳鏈。因此，您不會完全驗證區塊（例如，所有交易），而只會驗證迄今為止對所有標頭執行的 PoW，這非常快。

引用自：https://bitcoin.stackexchange.com/questions/114041