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myarbrough@oreilly.com 2014-11-19 06:16:52 -08:00
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@ -697,14 +697,15 @@ $ bitcoin-cli gettransaction 9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c30
----
[source,json]
----
++++
<screen language="json">
{
"amount" : 0.05000000,
"confirmations" : 1,
"blockhash" : "000000000000000051d2e759c63a26e247f185ecb7926ed7a6624bc31c2a717b",
"blockhash" : "000000000000000051d2e759c63a26e247f185ecb7926ed7a6624bc31c<?pdf-cr?>2a717b",
"blockindex" : 18,
"blocktime" : 1392660808,
"txid" : "9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c309acbae2c14ae3",
"txid" : "9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c309acbae2c14ae<?pdf-cr?>3",
"time" : 1392660908,
"timereceived" : 1392660908,
"details" : [
@ -716,7 +717,8 @@ $ bitcoin-cli gettransaction 9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c30
}
]
}
----
</screen>
++++
Here, we see the new information in the entries +blockhash+ (the hash of the block in which the transaction was included), and +blockindex+ with value 18 (indicating that our transaction was the 18th transaction in that block).
@ -733,19 +735,21 @@ Commands: +getblock+, +getblockhash+
((("bitcoin-cli command line helper","getblock command")))((("bitcoin-cli command line helper","getblockhash command")))((("blocks","exploring")))((("getblock command (bitcoin-cli)")))((("getblockhash command (bitcoin-cli)")))Now that we know which block our transaction was included in, we can query that block. We use the +getblock+ command with the block hash as the parameter:
----
$ bitcoin-cli getblock 000000000000000051d2e759c63a26e247f185ecb7926ed7a6624bc31c2a717b true
----
++++
<screen>
$ bitcoin-cli getblock 000000000000000051d2e759c63a26e247f185ecb7926ed7a6624b<?pdf-cr?>c31c2a717b true
</screen>
++++
[source,json]
----
++++
<screen language="json">
{
"hash" : "000000000000000051d2e759c63a26e247f185ecb7926ed7a6624bc31c2a717b",
"hash" : "000000000000000051d2e759c63a26e247f185ecb7926ed7a6624bc31c2a717<?pdf-cr?>b",
"confirmations" : 2,
"size" : 248758,
"height" : 286384,
"version" : 2,
"merkleroot" : "9891747e37903016c3b77c7a0ef10acf467c530de52d84735bd55538719f9916",
"merkleroot" : "9891747e37903016c3b77c7a0ef10acf467c530de52d84735bd555387<?pdf-cr?>19f9916",
"tx" : [
"46e130ab3c67d31d2b2c7f8fbc1ca71604a72e6bc504c8a35f777286c6d89bf0",
"2d5625725b66d6c1da88b80b41e8c07dc5179ae2553361c96b14bcf1ce2c3868",
@ -774,37 +778,42 @@ $ bitcoin-cli getblock 000000000000000051d2e759c63a26e247f185ecb7926ed7a6624bc31
"nonce" : 3888130470,
"bits" : "19015f53",
"difficulty" : 3129573174.52228737,
"chainwork" : "000000000000000000000000000000000000000000001931d1658fc04879e466",
"previousblockhash" : "0000000000000000177e61d5f6ba6b9450e0dade9f39c257b4d48b4941ac77e7",
"nextblockhash" : "0000000000000001239d2c3bf7f4c68a4ca673e434702a57da8fe0d829a92eb6"
"chainwork" : "000000000000000000000000000000000000000000001931d1658fc048<?pdf-cr?>79e466",
"previousblockhash" : "0000000000000000177e61d5f6ba6b9450e0dade9f39c257b4<?pdf-cr?>d48b4941ac77e7",
"nextblockhash" : "0000000000000001239d2c3bf7f4c68a4ca673e434702a57da8fe0<?pdf-cr?>d829a92eb6"
}
----
</screen>
++++
The block contains 367 transactions and as you can see, the 18th transaction listed (+9ca8f9...+) is the txid of the one crediting 50 millibits to our address. The +height+ entry tells us this is the 286384th block in the block chain.
We can also retrieve a block by its block height using the +getblockhash+ command, which takes the block height as the parameter and returns the block hash for that block:
----
$ bitcoin-cli getblockhash 0
000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
----
++++
<screen>
$ bitcoin-cli getblockhash 0000000000019d6689c085ae165831e934ff763ae46a2a6c17<?pdf-cr?>2b3f1b60a8ce26f
</screen>
++++
Here, we retrieve the block hash of the "genesis block," the first block mined by Satoshi Nakamoto, at height zero. Retrieving this block shows:
----
$ bitcoin-cli getblock 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
----
[source,json]
----
++++
<screen>
$ bitcoin-cli getblock 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1<?pdf-cr?>b60a8ce26f
</screen>
++++
++++
<screen language="json">
{
"hash" : "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
"hash" : "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26<?pdf-cr?>f",
"confirmations" : 286388,
"size" : 285,
"height" : 0,
"version" : 1,
"merkleroot" : "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
"merkleroot" : "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7af<?pdf-cr?>deda33b",
"tx" : [
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"
],
@ -812,10 +821,11 @@ $ bitcoin-cli getblock 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60
"nonce" : 2083236893,
"bits" : "1d00ffff",
"difficulty" : 1.00000000,
"chainwork" : "0000000000000000000000000000000000000000000000000000000100010001",
"nextblockhash" : "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"
"chainwork" : "0000000000000000000000000000000000000000000000000000000100<?pdf-cr?>010001",
"nextblockhash" : "00000000839a8e6886ab5951d76f411475428afc90947ee320161b<?pdf-cr?>bf18eb6048"
}
----
</screen>
++++
The +getblock+, +getblockhash+, and +gettransaction+ commands can be used to explore the block chain database, programmatically.