(plu-ts) full Typescript off-chain

[GENERAL] Summarize your solution to the problem.

Implement a 100% Typescript library to write off-chain code, minimizing dependencies

[GENERAL] Summarize your relevant experience.

• Cardano-Trace lead developer
• building and maintaining the "cardano-wallet-interface" npm package
• Single Pool node Operator(Harmonic [ARMN])
• a youtube channel to see with your eyes

[IMPACT] Please describe your proposed solution.

at the moment the options to write off-chain code do require lots of extra work or are even hard to integrate for new projects

the included video goes through some of them and exposes some arguments in support of the previous sentence

the library should allow both high-level usage and a lower one for more control;

as an example, a high-level function could be:

createDelegationTransaction(

"2a05c534817a0b97ce0c5a2354b6e35a067c52408fa70c77e0b5e378", // pool to delegate to

blockfrostQueryier // optional BlockchainQuerier to use to get data such as protocol-parameters

);

but a lower level transaction builder should still be available for personalized transactions, making possible things like:

function makeDelegationWithMyValidator() {

txBuilder.setCertificate(

makeDelegationCertificate(

"2a05c534817a0b97ce0c5a2354b6e35a067c52408fa70c77e0b5e378", // pool to delegate to

blockfrostQueryier // BlockchainQuerier to use to get data such as protocol-parameters

)

);

txBuilder.useStakeValidator(

new StakeValidator( "cafebeef" ) // will take the validator serialized code as input

)

txBuilder.setRedeemer({

bytes: "2a05c534817a0b97ce0c5a2354b6e35a067c52408fa70c77e0b5e378"

});

return txBuilder.buildTransaction();

}

[IMPACT] Please describe how your proposed solution will address the Challenge that you have submitted it in.

the implementation of a js/ts library will, with no doubts, help the existing developer ecosystem integrate solutions in the front-end logic alongside expanding it by allowing more developers to easily use the library functionalities

[IMPACT] What are the main risks that could prevent you from delivering the project successfully and please explain how you will mitigate each risk?

the idea "as is" is nothing new (we just need a better way to use what we know is possible), so all major challenges are known and the solutions too;

regarding the implementation the main risk is in code correctness and security, this risk should be mitigated by extensive testing

[FEASIBILITY] Please provide a detailed plan, including timeline and key milestones for delivering your proposal.

estimated 6 to 7 months

• safe primitives datatypes implemetation to overcome javascript limits ( 1 week )
• examples:
• uint64 for big integers to overcome 53-bit long javascript numbers
• uint128 and uint256 for hashes
• Integer class to simulate haskell variable length integers
• HexStrings
• etc.
• Plutus-optimized JSON-CBOR interoperability ( 2-3 weeks )

note: "Plutus-optimized" stands for efficent support for plutus specifics tag codes

• PlutusData implementation ( 1 week )
• JSON serializable object implementation ( 1-2 weeks )
• protocol-level datatypes implementation ( 4-6 weeks )
• including:
• Addresses
• Keys (private and public)
• UTxOs
• Assets and Values
• algorithm representations (Linear Fee Cost-model etc.)
• transaction-related datatypes implementation ( 6 weeks - 2 months )
• including:
• Metadata
• Witnesses
• Certificates
• Transactions
• etc.
• BlockchainQueryier common interface ( 2 weeks )

a class to help executing query againist the Cardano blockchain

• general BlockchainQueryier implementation
• default implementations:
• koiosQueryier
• ogmiosQueryier
• blockfrostQueryier
• etc.
• Smart Contract interaction ( 4-6 weeks )

NOTE: we are talking of the offchain code here, you'll need the smart contract bytecode to create instances, the bytecode is agnostic to the origin, could come from plu-ts/onchain or not

• SmartContract class
• MintingPolicy and StakeValidator classes

[FEASIBILITY] Please provide a detailed budget breakdown.

based on salary.com stats

( 32 $/h * 8 h/day * 30 day/month * 7 months )

53'760 $ for 8 months full-time development

based on the same logic of above, assuming maintainance is less intesive, covering 3 months for reference

( 32 $/h * 5 h/day * 30 day/month * 3 months )

14'400 $ for repository maintenance over time

this cost is present since, being plutus a relatively new tool, the smart contract creation details on cardano are constantly evolving, the amount should cover any additional and critical development update without the need to re-create a found request for it

[FEASIBILITY] Please provide details of the people who will work on the project.

to start up the project and minimise costs (maximizing the chances of being founded) the "team" will be constituted of only one person

unfortunately, I'm not very active on LinkedIn etc.

useful links are:

• my Twitter account
• my youtube channel
• my personal GitHub account
• HarmonicPool GitHub account

[FEASIBILITY] If you are funded, will you return to Catalyst in a later round for further funding? Please explain why / why not.

not for this proposal, but the on-chain proposal has already some ideas for expansion

[FEASIBILITY] Are you or any member of your team working on any other proposals in this Fund9?

[FEASIBILITY] Are you or your team working on any other proposals from previous Funds?

[AUDITABILITY] Please describe what you will measure to track your project's progress, and how will you measure these?

the project will be opensource, therefore verifiable by anyone with an internet connection

updates will be published on my Youtube channel with (possibly) weekly videos

and on my Twitter profile

[AUDITABILITY] What does success for this project look like?

the library has huge potential for dApp integration therefore seeing it used in various projects would be great

ideally, 2 or 3 projects with an average userbase would be a sign of adoption

[AUDITABILITY] Please provide information on whether this proposal is a continuation of a previously funded project in Catalyst or an entirely new one.

this proposal IS NOT a continuation of a previously funded project