Calculate compiled ErgoScript hash from URL

[greenhat]

Motivation

To show a hash of serialized ErgoTree for a published contract(ErgoScript). Think of a contract in EIP that is then used in some off-chain code. The idea is to give a user a way to check the hash of the published contract (EIP) to be equivalent to the hash of the compiled contract used in the app(off-chain code).

Implementation details

Fetch ErgoScript from a given URL (i.e. github), compile it to ErgoTree, serialize then calculate a hash. Print the hash along with P2S addresses for mainnet and testnet, and also print serialized ErgoTree in Base16 encoding (node/explorer API format).

[kettlebell]

Hi @greenhat, do you want this feature to be packaged as a separate playground, or part of the library? Also, does the dependency on ergo-scala-compiler overlap with appkit? Thanks.

[greenhat]

Part of the library. In the end, I see a link in EIP repo to Scastie that calculate and shows the hash for the contract in EIP's PR.
ergo-scala-compliler is ErgoScala to ErgoTree compiler, not ErgoScript. ErgoScala is compiled via Scala macros and is in PoC status.

[kettlebell]

When it's convenient for you, could I please get write access to this repo? I've got a PR for this issue ready to go.

[greenhat]

Sure. I sent an invitation.

[kettlebell]

Thank you!