<p>This is a known bug in the early days of bitcoin.</p>

<p>Was fixed by BIP-30 <a href="https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki" rel="noreferrer">https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki</a></p>

<p>There is a discussion here: <a href="https://bitcointalk.org/index.php?topic=216938" rel="noreferrer">https://bitcointalk.org/index.php?topic=216938</a></p>

<p>And yes, 50+50 bitcoins are missed forever.</p>

<p>In fact, there are much more missed bitcoins. For example, 2500 bitcoins were gone to nowhere 
in block 0000000000000449ee5b94ba7a051caffff5c23d6a03335f6e20e3985b5ffa61</p>

CC BY-SA 3.0
2014-06-11T11:49:01.157Z
2014-06-11T11:49:01.157Z
user15732
<p>This transaction is contained in two MainChain-Blocks:</p>

<p><a href="https://blockchain.info/tx/e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468" rel="noreferrer">https://blockchain.info/tx/e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468</a></p>

<p>On Blockexplorer there is a note of this anomaly:</p>

<p><a href="https://blockexplorer.com/block/00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721" rel="noreferrer">https://blockexplorer.com/block/00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721</a></p>

<p>As I understand, those 50 BTC are lost because only one of the rewards can be redeemed. </p>

<p>If so there will never be 21 million Bitcoin available, because those, or more of this sort, are missing?</p>

<blockchain><hash><history><coinbase-transaction><transaction-id>
Duplicated hash values in mining reward
Dennis Kriechel
# Duplicated hash values in mining reward

(Asked by: username_0 on 2014-06-11)

This transaction is contained in two MainChain-Blocks:

<https://blockchain.info/tx/e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468>

On Blockexplorer there is a note of this anomaly:

<https://blockexplorer.com/block/00000000000743f190a18c5577a3c2d2a1f610ae9601ac046a38084ccb7cd721>

As I understand, those 50 BTC are lost because only one of the rewards can be redeemed.

If so there will never be 21 million Bitcoin available, because those, or more of this sort, are missing?

**Tags:** blockchain, hash, history, coinbase-transaction, transaction-id


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## 1 answers

### Answer by username_1 on 2014-06-11. Score: 7 | Accepted answer

This is a known bug in the early days of bitcoin.

Was fixed by BIP-30 <https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki>

There is a discussion here: <https://bitcointalk.org/index.php?topic=216938>

And yes, 50+50 bitcoins are missed forever.

In fact, there are much more missed bitcoins. For example, 2500 bitcoins were gone to nowhere
in block 0000000000000449ee5b94ba7a051caffff5c23d6a03335f6e20e3985b5ffa61


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