<p>Presumably such altcoins will wait for the transaction to have several confirmations before declaring that the coins were provably burned.</p>

CC BY-SA 3.0
2017-09-19T03:57:13.560Z
2017-09-19T03:57:13.560Z
Ava Chow
<p>One approach to proof of burn is that you burn coins by sending them to a particular address specified by the altcoin.  For instance, with <a href="https://counterparty.io/news/why-proof-of-burn/" rel="noreferrer">Counterparty</a>, you could collect XCP by sending bitcoins to the "burn address" <code>1CounterpartyXXXXXXXXXXXXXXXUWLpVr</code>, thus making the bitcoins unspendable.  Presumably no other altcoin is going to choose that particular address as their burn address, so there is no way you could earn any other currency by burning coins in that manner.</p>

<p>Of course, someone <em>could</em> have started another currency (call it PDQ) that awards credit for coins burned to the Counterparty address, and then people sending coins to the Counterparty address would earn both XCP and PDQ.  I don't know of any reason why anybody would want to do that, or why anyone should expect the hypothetical PDQ currency to pick up any value.</p>

<p>Your reference to "double spend" suggests something different: that you might try to send bitcoins to the burn address for some altcoin, collect your altcoin reward, and then use a double-spend attack to reverse your burn transaction and keep the bitcoins after all (perhaps later burning them for a second altcoin).  As Andrew Chow says, the first altcoin should prevent this by waiting to award the altcoins until the bitcoin transaction has sufficiently many confirmations.  </p>

CC BY-SA 3.0
2017-09-19T04:11:14.657Z
2017-09-19T04:11:14.657Z
Nate Eldredge
<p>This is simply a matter of requiring a specific address to be used in the proof of burn, and to wait for confirmation of the transaction.</p>

CC BY-SA 3.0
2017-09-21T20:25:55.453Z
2017-09-21T20:25:55.453Z
Murch
<p>Proof of Burn lets someone buy into an Alt Coin.</p>

<p>How is it policed so that someone doesn't "double-spend" by using the same Proof of Burn to simultaneously buy into Alt Coin 1 and Alt Coin 2?</p>

<altcoin><proof-of-destruction>
how is Proof of Burn policed to prevent simultaneous buying into multiple alt currencies?
thanks_in_advance
# how is Proof of Burn policed to prevent simultaneous buying into multiple alt currencies?

(Asked by: username_0 on 2017-09-18)

Proof of Burn lets someone buy into an Alt Coin.

How is it policed so that someone doesn't "double-spend" by using the same Proof of Burn to simultaneously buy into Alt Coin 1 and Alt Coin 2?

**Tags:** altcoin, proof-of-destruction


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## 3 answers

### Answer by username_1 on 2017-09-19. Score: 1 | Accepted answer

Presumably such altcoins will wait for the transaction to have several confirmations before declaring that the coins were provably burned.


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### Answer by username_2 on 2017-09-19. Score: 6

One approach to proof of burn is that you burn coins by sending them to a particular address specified by the altcoin. For instance, with [Counterparty](https://counterparty.io/news/why-proof-of-burn/), you could collect XCP by sending bitcoins to the "burn address" `1CounterpartyXXXXXXXXXXXXXXXUWLpVr`, thus making the bitcoins unspendable. Presumably no other altcoin is going to choose that particular address as their burn address, so there is no way you could earn any other currency by burning coins in that manner.

Of course, someone *could* have started another currency (call it PDQ) that awards credit for coins burned to the Counterparty address, and then people sending coins to the Counterparty address would earn both XCP and PDQ. I don't know of any reason why anybody would want to do that, or why anyone should expect the hypothetical PDQ currency to pick up any value.

Your reference to "double spend" suggests something different: that you might try to send bitcoins to the burn address for some altcoin, collect your altcoin reward, and then use a double-spend attack to reverse your burn transaction and keep the bitcoins after all (perhaps later burning them for a second altcoin). As Andrew username_1 says, the first altcoin should prevent this by waiting to award the altcoins until the bitcoin transaction has sufficiently many confirmations.


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### Answer by username_3 on 2017-09-21. Score: 1

This is simply a matter of requiring a specific address to be used in the proof of burn, and to wait for confirmation of the transaction.


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