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bip-0300: Add OP_DRIVECHAIN

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Luke Dashjr 2023-07-26 19:45:51 +00:00
parent 55566a73f9
commit 2cccaf650f
1 changed files with 11 additions and 3 deletions
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@ -226,7 +226,7 @@ A sidechain fails to activate if:
Otherwise, the sidechain activates (Active is set to TRUE).
In the block in which the sidechain activates, the coinbase MUST include at least one 0-valued OP_TRUE. This output becomes the initial CTIP for the sidechain.
In the block in which the sidechain activates, the coinbase MUST include at least one 0-valued OP_DRIVECHAIN output. This output becomes the initial CTIP for the sidechain.
@ -394,7 +394,7 @@ Every time a deposit/withdrawal is made, the old CTIP is spent and a new one is
Every M5 is valid, as long as:
* It has at least one OP_TRUE output -- this becomes the new CTIP.
* It has at least one OP_DRIVECHAIN output -- this becomes the new CTIP.
* The new CTIP has '''more''' coins in it, than before.
@ -405,7 +405,7 @@ We come, finally, to the critical matter: where users can take their money *out*
M6 is invalid if:
* The blinded hash of M6 does NOT match one of the approved Bundle-hashes. (In other words: M6 must first be approved by 13,150 upvotes.)
* The first output of M6 is NOT an OP_TRUE. (This OP_TRUE becomes the new CTIP. In other words: all non-withdrawn coins are paid back to the sidechain.)
* The first output of M6 is NOT an OP_DRIVECHAIN. (This OP_DRIVECHAIN becomes the new CTIP. In other words: all non-withdrawn coins are paid back to the sidechain.)
* The second output is NOT an OP_RETURN script of exactly 10 bytes, of which 8 bytes are a serialized Bitcoin amount.
* The txn fee of M6 is NOT exactly equal to the amount of the previous bullet point.
@ -413,8 +413,16 @@ Else, M6 is valid.
(The point of the latter two bullet points, is to allow the bundle hash to cover the L1 transaction fee.)
===OP_DRIVECHAIN===
This proposal adds a single new opcode, OP_DRIVECHAIN, which has strict semantics for usage.
OP_NOP5 (0xb4) is redefined as OP_DRIVECHAIN if and only if the entire script is OP_DRIVECHAIN followed by a single-byte push and OP_TRUE (exactly 4 bytes).
The single-byte push contains the sidechain number.
Note that this is not a "script number", and cannot be OP_1..OP_16 or any other kind of push; it is also unsigned, and must not be padded even if over sidechain number 127.
The final OP_TRUE is to ensure this change remains a softfork:
without it, sidechain numbers 0 and 128 would cause the legacy script interpreter to fail.
If an OP_DRIVECHAIN input is spent, the additional rules for M5 or M6 (see above) must be enforced.
==Backward compatibility==