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while time of contract development, management decided to don't burn any token and we will use our token as utility token for apps but now they have decided to burn unsold tokens after ICO. our contract doesn't have any burn method.

is there any alternate way or public address where I can transfers token to be burnt and is this legal way?

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Yes, you can burn the tokens simply by making them inaccessible. The typical way is to send them to address 0x0 which is typically used as a burn address.

After the tokens are sent to this kind of burn address, they become inaccessible as nobody has a private key corresponding to the address - or it's very unlike for anyone to ever acquire such a private key.

Legality always depends on your country and on many things and this is not the best forum for legal discussions.

  • in contract, we have condition to prevent sending token to 0x0 to avoid user input error. do we have any other such address? – murtza gondal Jan 15 at 12:34
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    Basically any address is ok. The chance of someone having the right private key is exactly the same for any address. 0x0 is just convenient as everyone knows it's a burn address. You can just use 0x1 if you wish, or whatever. – Lauri Peltonen Jan 15 at 12:51
  • Lauri, thanks for the reply but I can see there are out transactions for 0x0000000000000000000000000000000000000001 etherscan.io/address/… – murtza gondal Jan 15 at 13:08
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    Those are token transactions. If you check the "transactions" tab you see there are no real outgoing transactions. Token transactions are defined by token contracts and the creator can input any data they want there. Using 0x0 as the "source" is often used to indicate minting of tokens, so the tokens were created out of thin air. – Lauri Peltonen Jan 15 at 13:11

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