<pre>
  BIP: 8
  Title: Version bits with lock-in by height
  Author: Shaolin Fry <shaolinfry@protonmail.ch>
          Luke Dashjr <luke+bip@dashjr.org>
  Comments-Summary: No comments yet.
  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0008
  Status: Draft
  Type: Informational
  Created: 2017-02-01
  License: BSD-3-Clause
           CC0-1.0
</pre>

==Abstract==

This document specifies an alternative to [[bip-0009.mediawiki|BIP9]] that corrects for a number of perceived mistakes.
Block heights are used for start and timeout rather than POSIX timestamps.
It additionally introduces an additional activation parameter to guarantee activation of backward-compatible changes (further called "soft forks").

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

==Motivation==

BIP9 introduced a mechanism for doing parallel soft forking deployments based on repurposing the block nVersion field. Activation is dependent on near unanimous hashrate signalling which may be impractical and result in veto by a small minority of non-signalling hashrate. Super majority hashrate based activation triggers allow for accelerated activation where the majority hash power enforces the new rules in lieu of full nodes upgrading. Since all consensus rules are ultimately enforced by full nodes, eventually any new soft fork will be enforced by the economy. This proposal combines these two aspects to provide eventual flag day activation after a reasonable time (recommended a year), as well as for accelerated activation by majority of hash rate before the flag date.

Due to using timestamps rather than block heights, it was found to be a risk that a sudden loss of significant hashrate could interfere with a late activation.

Block time is somewhat unreliable and may be intentionally or unintentionally inaccurate, so thresholds based on block time are not ideal. Secondly, BIP9 specified triggers based on the first retarget after a given time, which is non-intuitive. Since each new block must increase the height by one, thresholds based on block height are much more reliable and intuitive and can be calculated exactly for difficulty retarget.

==Specification==

===Parameters===

Each soft fork deployment is specified by the following per-chain parameters (further elaborated below):

# The '''name''' specifies a very brief description of the soft fork, reasonable for use as an identifier. For deployments described in a single BIP, it is recommended to use the name "bipN" where N is the appropriate BIP number.
# The '''bit''' determines which bit in the nVersion field of the block is to be used to signal the soft fork lock-in and activation. It is chosen from the set {0,1,2,...,28}.
# The '''startheight''' specifies the height of the first block at which the bit gains its meaning.
# The '''timeoutheight''' specifies a block height at which the miner signalling ends. Once this height has been reached, if the soft fork has not yet locked in (excluding this block's bit state), the deployment is considered failed on all descendants of the block.
# The '''lockinontimeout''' boolean if set to true, blocks are required to signal in the final period, ensuring the soft fork has locked in by timeoutheight.

===Selection guidelines===

The following guidelines are suggested for selecting these parameters for a soft fork:

# '''name''' should be selected such that no two softforks, concurrent or otherwise, ever use the same name.
# '''bit''' should be selected such that no two concurrent softforks use the same bit.
# '''startheight''' should be set to some block height in the future, approximately 30 days (or 4320 blocks) after a software release date including the soft fork.  This allows for some release delays, while preventing triggers as a result of parties running pre-release software, and ensures a reasonable number of full nodes have upgraded prior to activation. It should be rounded up to the next height which begins a retarget period for simplicity.
# '''timeoutheight''' should be 1 year, or 52416 blocks (26 retarget intervals) after '''startheight'''.
# '''lockinontimeout''' should be set to true for any softfork that is expected or found to have political opposition from a non-negligible percent of miners. (It can be set after the initial deployment, but cannot be cleared once set.)

A later deployment using the same bit is possible as long as the startheight is after the previous one's
timeoutheight or activation, but it is discouraged until necessary, and even then recommended to have a pause in between to detect buggy software.

===States===

With each block and soft fork, we associate a deployment state. The possible states are:

# '''DEFINED''' is the first state that each soft fork starts out as. The genesis block is by definition in this state for each deployment.
# '''STARTED''' for blocks at or beyond the startheight.
# '''MUST_SIGNAL''' for one retarget period prior to the timeout, if LOCKED_IN was not reached and '''lockinontimeout''' is true.
# '''LOCKED_IN''' for one retarget period after the first retarget period with STARTED (or MUST_SIGNAL) blocks of which at least threshold have the associated bit set in nVersion.
# '''ACTIVE''' for all blocks after the LOCKED_IN retarget period.
# '''FAILED''' for all blocks after the timeoutheight if LOCKED_IN is not reached.

===Bit flags===

The nVersion block header field is to be interpreted as a 32-bit little-endian integer (as present), and bits are selected within this integer as values (1 << N) where N is the bit number.

Blocks in the STARTED state get an nVersion whose bit position bit is set to 1. The top 3 bits of such blocks must be
001, so the range of actually possible nVersion values is [0x20000000...0x3FFFFFFF], inclusive.

Due to the constraints set by BIP 34, BIP 66 and BIP 65, we only have 0x7FFFFFFB possible nVersion values available.
This restricts us to at most 30 independent deployments. By restricting the top 3 bits to 001 we get 29 out of those
for the purposes of this proposal, and support two future upgrades for different mechanisms (top bits 010 and 011).
When a block nVersion does not have top bits 001, it is treated as if all
bits are 0 for the purposes of deployments.

===New consensus rules===

The new consensus rules for each soft fork are enforced for each block that has ACTIVE state.

During the MUST_SIGNAL and LOCKED_IN phases, blocks that fail to signal are invalid.
For flexibility, during the LOCKED_IN phase only, this rule does NOT require the top 3 bits to be set any particular way.

===State transitions===

<img src="bip-0008/states.png" align="middle"></img>

During the STARTED state if the '''lockinontimeout''' is set to true, the state will transition to LOCKED_IN when '''timeoutheight''' is reached.

The genesis block has state DEFINED for each deployment, by definition.

    State GetStateForBlock(block) {
        if (block.height == 0) {
            return DEFINED;
        }

All blocks within a retarget period have the same state. This means that if
floor(block1.height / 2016) = floor(block2.height / 2016), they are guaranteed to have the same state for every
deployment.

        if ((block.height % 2016) != 0) {
            return GetStateForBlock(block.parent);
        }

Otherwise, the next state depends on the previous state:

        switch (GetStateForBlock(GetAncestorAtHeight(block, block.height - 2016))) {

We remain in the initial state until we reach the start block height.

        case DEFINED:
            if (block.height >= startheight) {
                return STARTED;
            }
            return DEFINED;

After a period in the STARTED state, we tally the bits set,
and transition to LOCKED_IN if a sufficient number of blocks in the past period set the deployment bit in their
version numbers. The threshold is ≥1916 blocks (95% of 2016), or ≥1512 for testnet (75% of 2016).
If the threshold hasn't been met, lockinontimeout is true, and we are at the last period before the timeout, then we transition to MUST_SIGNAL.
If the threshold hasn't been met and we reach the timeout, we transition directly to FAILED.

Note that a block's state never depends on its own nVersion; only on that of its ancestors.

        case STARTED:
            int count = 0;
            walk = block;
            for (i = 0; i < 2016; i++) {
                walk = walk.parent;
                if (walk.nVersion & 0xE0000000 == 0x20000000 && (walk.nVersion >> bit) & 1 == 1) {
                    ++count;
                }
            }
            if (count >= threshold) {
                return LOCKED_IN;
            } else if (lockinontimeout && block.height + 2016 >= timeoutheight) {
                return MUST_SIGNAL;
            } else if (block.height >= timeoutheight) {
                return FAILED;
            }
            return STARTED;

If we have finished a period of MUST_SIGNAL, we transition directly to LOCKED_IN.

        case MUST_SIGNAL:
            return LOCKED_IN;

After a retarget period of LOCKED_IN, we automatically transition to ACTIVE.

        case LOCKED_IN:
            return ACTIVE;

And ACTIVE and FAILED are terminal states, which a deployment stays in once they're reached.

        case ACTIVE:
            return ACTIVE;

        case FAILED:
            return FAILED;
        }
    }

'''Implementation'''
It should be noted that the states are maintained along block chain
branches, but may need recomputation when a reorganization happens.

Given that the state for a specific block/deployment combination is completely determined by its ancestry before the
current retarget period (i.e. up to and including its ancestor with height block.height - 1 - (block.height % 2016)),
it is possible to implement the mechanism above efficiently and safely by caching the resulting state of every multiple-of-2016
block, indexed by its parent.

===Mandatory signalling===

Blocks received while in the MUST_SIGNAL and LOCKED_IN phases must be checked to ensure that they signal. For example:

    if (GetStateForBlock(block) == MUST_SIGNAL) {
        if ((block.nVersion & 0xE0000000) != 0x20000000 || ((block.nVersion >> bit) & 1) != 1) {
            return state.Invalid(BlockValidationResult::RECENT_CONSENSUS_CHANGE, "bad-version-bip8-must-signal");
        }
    }
    if (GetStateForBlock(block) == LOCKED_IN) {
        if (((block.nVersion >> bit) & 1) != 1) {
            return state.Invalid(BlockValidationResult::RECENT_CONSENSUS_CHANGE, "bad-version-bip8-locked-in");
        }
    }

Implementations should be careful not to ban peers that send blocks that are invalid due to not signalling (or blocks that build on those blocks), as that would allow an incompatible chain that is only briefly longer than the compliant chain to cause a split of the p2p network. If that occurred, nodes that have not set ''lockinontimeout'' may not see new blocks in the compliant chain, and thus not reorg to it at the point when it has more work, and would thus not be following the valid chain with the most work.

Implementations with ''lockinontimeout'' set to true may potentially follow a lower work chain than nodes with ''lockinontimeout'' set to false for an extended period. In order for this not to result in a net split nodes with ''lockinontimeout'' set to true, those nodes may need to preferentially connect to each other. Deployments proposing that implementations set ''lockinontimeout'' to true should either use parameters that do not risk there being a higher work alternative chain, or specify a mechanism for implementations that support the deployment to preferentially peer with each other.

===Warning mechanism===

To support upgrade warnings, an extra "unknown upgrade" is tracked, using the "implicit bit" mask = (block.nVersion & ~expectedVersion) != 0. Mask will be non-zero whenever an unexpected bit is set in nVersion.  Whenever LOCKED_IN for the unknown upgrade is detected, the software should warn loudly about the upcoming soft fork. It should warn even more loudly after the next retarget period (when the unknown upgrade is in the ACTIVE state).

===getblocktemplate changes===

The template request Object is extended to include a new item:

{| class="wikitable"
!colspan=4| template request
|-
! Key !! Required !! Type !! Description
|-
| rules || No || Array of Strings || list of supported softfork deployments, by name
|}

The template Object is also extended:

{| class="wikitable"
!colspan=4| template
|-
! Key !! Required !! Type !! Description
|-
| rules || Yes || Array of Strings || list of softfork deployments, by name, that are active state
|-
| vbavailable || Yes || Object || set of pending, supported softfork deployments; each uses the softfork name as the key, and the softfork bit as its value
|-
| vbrequired || No || Number || bit mask of softfork deployment version bits the server requires enabled in submissions
|}

The "version" key of the template is retained, and used to indicate the server's preference of deployments.
If versionbits is being used, "version" MUST be within the versionbits range of [0x20000000...0x3FFFFFFF].
Miners MAY clear or set bits in the block version WITHOUT any special "mutable" key, provided they are listed among the template's "vbavailable" and (when clearing is desired) NOT included as a bit in "vbrequired".
Servers MUST set bits in "vbrequired" for deployments in MUST_SIGNAL and LOCKED_IN states, to ensure blocks produced are valid.

Softfork deployment names listed in "rules" or as keys in "vbavailable" may be prefixed by a '!' character.
Without this prefix, GBT clients may assume the rule will not impact usage of the template as-is; typical examples of this would be when previously valid transactions cease to be valid, such as BIPs 16, 65, 66, 68, 112, and 113.
If a client does not understand a rule without the prefix, it may use it unmodified for mining.
On the other hand, when this prefix is used, it indicates a more subtle change to the block structure or generation transaction; examples of this would be BIP 34 (because it modifies coinbase construction) and 141 (since it modifies the txid hashing and adds a commitment to the generation transaction).
A client that does not understand a rule prefixed by '!' must not attempt to process the template, and must not attempt to use it for mining even unmodified.

=== Reference implementation ===

https://github.com/bitcoin/bitcoin/compare/master...luke-jr:bip8

==Contrasted with BIP 9==

* The '''lockinontimeout''' flag is added, providing a way to guarantee transition to LOCKED_IN.
* Block heights are used for the deployment monotonic clock, rather than median-time-past.

==Backwards compatibility==

BIP8 and BIP9 deployments should not share concurrent active deployment bits. Nodes that only implement BIP9 will not activate a BIP8 soft fork if hashpower threshold is not reached by '''timeoutheight''', however, those nodes will still accept the blocks generated by activated nodes.

==Deployments==

A living list of deployment proposals can be found [[bip-0008/assignments.mediawiki|here]].

==References==

[[bip-0009.mediawiki|BIP9]]

[https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-February/013643.html Mailing list discussion]

==Copyright==

This document is dual licensed as BSD 3-clause, and Creative Commons CC0 1.0 Universal.