[Bitcoin-development] Proposal: soft-fork to make anyone-can-spend outputs unspendable for 100 blocks

Melvin Carvalho melvincarvalho at gmail.com
Mon Jun 3 23:43:27 UTC 2013

On 1 June 2013 21:30, Peter Todd <pete at petertodd.org> wrote:

> Currently the most compact way (proof-size) to sacrifice Bitcoins that
> does not involve making them unspendable is to create a anyone-can-spend
> output as the last txout in the coinbase of a block:
> scriptPubKey: <data> OP_TRUE
> The proof is then the SHA256 midstate, the txout, and the merkle path to
> the block header. However this mechanism needs miner support, and it is
> not possible to pay for such a sacrifice securely, or create an
> assurance contract to create one.

Sorry if this is a stupid question, but why would someone want to sacrifice
their bitcoins?

> A anyone-can-spend in a regular txout is another option, but there is no
> way to prevent a miner from including a transaction spending that txout
> in the same block. Once that happens, there is no way to prove the miner
> didn't create both, thus invalidating the sacrifice. The announce-commit
> protocol solves that problem, but at the cost of a much larger proof,
> especially if multiple parties want to get together to pay the cost of
> the sacrifice. (the proof must include the entire tx used to make the
> sacrifice)
> However if we add a rule where txouts ending in OP_TRUE are unspendable
> for 100 blocks, similar to coinbases, we fix these problems. The rule
> can be done as a soft-fork with 95% support in the same way the
> blockheight rule was implemented. Along with that change
> anyone-can-spend outputs should be make IsStandard() so they will be
> relayed.
> The alternative is sacrifices to unspendable outputs, which is very
> undesirable compared to sending the money to miners to further
> strengthen the security of the network.
> We should always make it easy for people to write code that does what is
> best for Bitcoin.
> --
> 'peter'[:-1]@petertodd.org
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