PoX Updates: `.pox-info` contract for native information getters

[kantai]

As part of Stacks 2.1, we should add an extension contract for obtain PoX information that must be implemented as native functions:

• Getter for address lock information
• Getter for whether an address is able to "early unlock"
• Getter for current cycle reward set information

[jcnelson]

Adding to this:

• Getter for how much BTC was committed for the winning block
• Getter for how much BTC was committed for the entire sortition (requires fixing [chainstate] burnchain_sortition_burn calculation is for the previous, not current sortition #2492)

We need these things to figure out what the BTC-denominated price of STX is on-chain.

Drilling down into "address lock information" and "current reward cycle set information", what do you think of these?

• Getter for how many PoX addresses a Stacker clinched
• Getter for how much a Stacker has been paid in BTC so far in this cycle
• Getter for how many reward slots a Stacker will receive this cycle
• Getter for how many reward slots a Stacker has been paid out to this cycle (including instances where no BTC was paid)

[aulneau]

Something that might be nice would be some getters for delegate information. Right now it's pretty hard and a manual process to get data around pools that use contracts to call the pox contract. I have to manually know of and fetch data for each contract. If there is some way to make this clearer from the pox extension contract itself, that'd be fantastic!

[hstove]

Another request would be:

• Getter for how much a Stacker was paid in BTC in a particular block

[hstove]

For this feature:

Getter for how much a Stacker has been paid in BTC so far in this cycle

It would be great to also allow cycle to be a parameter, so you could query for past cycles

[jcnelson]

Added already: stx-get-account

[jcnelson]

Regarding the getter for address lock information, this is the interface @lgalabru proposed:

What's our take on adding a pox key to get-block-info?, such as (get-block-info? pox <block-id>) returns a tuple (list 2 { recipient: principal, total-transfered: uint })?

[jcnelson]

Split this issue into things we can put into .pox-info, and things that must live in get-block-info?.

[jcnelson]

Insofar as the minimum viable changes for .pox-2, simply exposing all of the contract state via getters should be sufficient. Querying data that is not in .pox-2 like the reward addresses should be a separate issue.

[pavitthrap]

Request to make current-pox-reward-cycle and burn-height-to-reward-cycle non private for the work in #3035

[blockstack-devops]

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