According to this post: What are the keys used in the blockchain levelDB (ie what are the key:value pairs)?
One type of the keys in leveldb of bitcoin is formed in the following way
'b' + 32-byte block hash
I wrote the following code in go but I got "not found".
genesisBlockHash := "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
hashBytes, _ := hex.DecodeString(genesisBlockHash)
keyBytes := append([]byte("b"), hashBytes...)
data, err := db.Get(keyBytes, nil)
Where did I do wrong? How can I add 'b'
to the hash?
Tried a simple case:
'R' -> 1-byte boolean ('1' if true): whether we're in the process of reindexing.
Go code
data, err := db.Get([]byte("R"), nil)
But I still got "not found". Why...
Tried file.
'f' + 4-byte file number -> file information record.
I could get some data. I think the following code should retrieve the "blk00000.dat" block file information, right?
readFile(db, []byte{0, 0, 0, 0})
func readFile(db *leveldb.DB, file []byte) {
data, err := db.Get(append([]byte("f"), file...), nil)
if err != nil {
log.Println(err)
os.Exit(1)
}
// read data
}