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Title: Can block height change ? Post by: upal on January 02, 2014, 09:20:46 PM When I register the block height of a transaction with the following API, does that remain fixed forever ?
https://blockchain.info/rawtx/txHash ...and one more thing. I was checking this : http://blockexplorer.com/q/getblockhash/273824 ...It used to return a proper block hash a few days ago. Now it says the following. Why so ? ERROR: unknown (Most likely my bitcoind stopped working or this page is too large/complex.) Title: Re: Can block height change ? Post by: yogi on January 02, 2014, 09:26:23 PM Not sure what you mean by 'register the block height of a transaction', but the likelihood of a block being orphaned becomes exponentially more improbable the deeper it is in the chain.
Title: Re: Can block height change ? Post by: upal on January 02, 2014, 09:57:58 PM Not sure what you mean by 'register the block height of a transaction', but the likelihood of a block being orphaned becomes exponentially more improbable the deeper it is in the chain. I mean I was doing some calculation on the following transaction taking it as a reference. https://blockchain.info/rawtx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 As far as I can remember, the block height I registered for this transaction was 273824. But now it seems, its block height is 266559 !!! So, I am confused, if it is my mistake or block height can change with time !!! Title: Re: Can block height change ? Post by: yogi on January 02, 2014, 10:19:52 PM Not sure what you mean by 'register the block height of a transaction', but the likelihood of a block being orphaned becomes exponentially more improbable the deeper it is in the chain. I mean I was doing some calculation on the following transaction taking it as a reference. https://blockchain.info/rawtx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 As far as I can remember, the block height I registered for this transaction was 273824. But now it seems, its block height is 266559 !!! So, I am confused, if it is my mistake or block height can change with time !!! What do you mean when you say 'block height I registered'? You can not specify what height your transaction is in the block. It is up to the miner to include your transaction, or not. Title: Re: Can block height change ? Post by: upal on January 02, 2014, 10:28:20 PM Not sure what you mean by 'register the block height of a transaction', but the likelihood of a block being orphaned becomes exponentially more improbable the deeper it is in the chain. I mean I was doing some calculation on the following transaction taking it as a reference. https://blockchain.info/rawtx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 As far as I can remember, the block height I registered for this transaction was 273824. But now it seems, its block height is 266559 !!! So, I am confused, if it is my mistake or block height can change with time !!! What do you mean when you say 'block height I registered'? You can not specify what height your transaction is in the block. It is up to the miner to include your transaction, or not. registered means I noted down that value. Title: Re: Can block height change ? Post by: yogi on January 02, 2014, 10:39:00 PM registered means I noted down that value. Ah, ok. While not impossible it is highly improbable that the block height of that transaction change by such a degree. A much more likely scenario is that the original number was erroneous. Title: Re: Can block height change ? Post by: upal on January 03, 2014, 09:49:32 AM registered means I noted down that value. Ah, ok. While not impossible it is highly improbable that the block height of that transaction change by such a degree. A much more likely scenario is that the original number was erroneous. OMG !!! Does it happen in Bitcoin protocol ? The block height can change !!! OOOPS. Neways, can u plz tell me why this is happening ? I was checking this : http://blockexplorer.com/q/getblockhash/273824 ...It used to return a proper block hash a few days ago. Now it says the following. Why so ? Code: ERROR: unknown (Most likely my bitcoind stopped working or this page is too large/complex.) Title: Re: Can block height change ? Post by: empoweoqwj on January 03, 2014, 10:37:32 AM Not sure what you mean by 'register the block height of a transaction', but the likelihood of a block being orphaned becomes exponentially more improbable the deeper it is in the chain. I mean I was doing some calculation on the following transaction taking it as a reference. https://blockchain.info/rawtx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 As far as I can remember, the block height I registered for this transaction was 273824. But now it seems, its block height is 266559 !!! So, I am confused, if it is my mistake or block height can change with time !!! By 'block height' do you mean 'block length'? Title: Re: Can block height change ? Post by: upal on January 03, 2014, 12:50:33 PM Not sure what you mean by 'register the block height of a transaction', but the likelihood of a block being orphaned becomes exponentially more improbable the deeper it is in the chain. I mean I was doing some calculation on the following transaction taking it as a reference. https://blockchain.info/rawtx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 As far as I can remember, the block height I registered for this transaction was 273824. But now it seems, its block height is 266559 !!! So, I am confused, if it is my mistake or block height can change with time !!! By 'block height' do you mean 'block length'? I am not sure what is 'block length', but in the link mentioned above blockchain.info returns a value against block_height, which if I deduct from current main chain block height (https://blockchain.info/q/getblockcount), returns the no. of confirmations. Title: Re: Can block height change ? Post by: deepceleron on January 04, 2014, 12:35:05 AM Most of the blockexplorer.com "q" links like the OP, and other functions such as transaction hash lookup, are not working, likely for the exact reason it told you: Most likely my bitcoind stopped working.
The information in the other links is not contained in the blockchain, it is all derived information from the database that blockchain.info runs, including the comments. In addition, the numbers in that URL are internal database numbers that do not correspond with the actual block height, as orphaned blocks also are given numbers. The transaction you reference can be seen here: https://blockchain.info/tx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 It was included in network block 266559. Title: Re: Can block height change ? Post by: upal on January 04, 2014, 11:11:57 AM Most of the blockexplorer.com "q" links like the OP, and other functions such as transaction hash lookup, are not working, likely for the exact reason it told you: Most likely my bitcoind stopped working. The information in the other links is not contained in the blockchain, it is all derived information from the database that blockchain.info runs, including the comments. In addition, the numbers in that URL are internal database numbers that do not correspond with the actual block height, as orphaned blocks also are given numbers. The transaction you reference can be seen here: https://blockchain.info/tx/114f37f3e30c7d9b5d5339e9a1652f2f065d0413fe34ee1121de0f21a50aaed3 It was included in network block 266559. So, does it mean, the values we see on blockchain.info, e.g. no. of confirmations, are not reliable ? Title: Re: Can block height change ? Post by: sidazhang on January 06, 2014, 06:35:35 AM registered means I noted down that value. Ah, ok. While not impossible it is highly improbable that the block height of that transaction change by such a degree. A much more likely scenario is that the original number was erroneous. OMG !!! Does it happen in Bitcoin protocol ? The block height can change !!! OOOPS. Neways, can u plz tell me why this is happening ? I was checking this : http://blockexplorer.com/q/getblockhash/273824 ...It used to return a proper block hash a few days ago. Now it says the following. Why so ? Code: ERROR: unknown (Most likely my bitcoind stopped working or this page is too large/complex.) Probably a bug in in blockexplorer blockchain info endpoint is just fine https://blockchain.info/block-height/273824 |