feat(zclassic): Add Zclassic (ZCL) support by lelonex · Pull Request #4152 · bitpay/bitcore · GitHub

Summary

This PR adds full support for Zclassic (ZCL) — a community-driven, open-source fork of Zcash — to the Bitcore monorepo.

Zclassic was created in 2016 by removing the 20% founder's reward from Zcash, making it a purely community-owned coin. It uses the Equihash proof-of-work algorithm, supports transparent (t1/t3) and shielded addresses, and is fully compatible with the Zcash transaction format (ZIP-205/Sapling).

Note: This submission is made on behalf of the Zclassic community. There is no company or organization behind it. We are requesting review and merge on technical merit and ask for no preferential treatment — only fair consideration.

Changes

New Packages

packages/zclassic-bitcore-lib — Core JavaScript library for Zclassic. Handles key derivation, address encoding/decoding, transaction building and signing, Equihash block header parsing, and ZIP-205 Sapling signature hash computation.
packages/zclassic-bitcore-p2p — P2P networking layer for Zclassic. Implements the Zclassic wire protocol (magic bytes 0x24e92764, port 8033, protocol version 170011).

Modified Packages

packages/bitcore-node

Added modules/zclassic/ — ZCL chain module, P2P sync worker, and verification peer
Added providers/chain-state/zcl/ — chain state provider for ZCL
Modified providers/libs/index.ts — register zclassic-bitcore-lib and zclassic-bitcore-p2p
Modified modules/index.ts — register ZCL module
Fixed models/block.ts — skip transactions with negative fees in fee statistics (affects Sapling shielded transactions)
Fixed models/transaction.ts — clamp negative fee values to 0 (Sapling valueBalance caused incorrect negative fees)

packages/crypto-wallet-core

Added src/constants/chains.ts — ZCL chain identifier
Added src/derivation/zcl/ — BIP44 derivation path m/44'/147'/0'/0/0
Added src/transactions/zcl/ — transaction builder
Added src/validation/zcl/ — address validation
Added src/message/zcl.ts — message signing
Added src/types/zcl-modules.d.ts — TypeScript ambient declarations

packages/insight

Added ZCL to supported currencies and coin selector
Added ZCL logo
Updated constants.ts — ZCL API routing
Updated helper-methods.ts — getApiRoot() returns correct endpoint for ZCL
TypeScript type declarations for zclassic-bitcore-lib

Technical Details

Property	Value
Coin ID (SLIP-0044)	147
Symbol	ZCL
Decimals	8
Network magic	0x24e92764
P2P port	8033
RPC port	8023
Protocol version	170011
P2PKH prefix	0x1C 0xB8 — t1 addresses
P2SH prefix	0x1C 0xBD — t3 addresses
Transaction format	Zcash v4 / ZIP-205 (Sapling)
Derivation path	m/44'/147'/0'/0/0
Explorer	https://explorer.zcl.zelcore.io

Testing

The implementation has been tested against a live Zclassic mainnet node (zclassicd v2.1.1-10):

Full blockchain sync completed (3,070,000+ blocks indexed)
P2P connection stable with protocol version 170011
Address derivation, transaction building and broadcasting verified
Insight explorer fully functional with live ZCL data
Fee calculation correctly handles Sapling valueBalance edge cases

References

Add full ZCL support including: - zclassic-bitcore-lib: core library (Equihash, ZIP-205, transparent addresses) - zclassic-bitcore-p2p: P2P networking layer - bitcore-node: ZCL chain module, P2P worker, chain-state provider - crypto-wallet-core: ZCL derivation, transaction builder, address validation - insight: ZCL UI support, logo, constants - Fix negative fee calculation for Sapling/shielded transactions

…ore-lib, regenerate lock file Resolves CI failure: npm ci could not find zclassic-bitcore-lib in registry. Changed dependency from npm semver to file:../zclassic-bitcore-lib (local monorepo package).

…as local dependencies Required by src/providers/libs/index.ts at runtime. Both resolved as file: references to local monorepo packages.

…back In environments where zclassic packages are not installed (e.g. CI running npm ci on individual packages), the eager require was crashing at module load time. Now ZCL libs are loaded lazily and silently skipped if not available.

Note: the test:crypto-rpc CI failure seems a pre-existing flaky test unrelated to this PR. The error is ProviderError: transaction indexing is in progress on the geth node — a race condition in the test environment during startup.

ZCL (Zclassic) is a Bitcoin-protocol chain and uses its own node (zclassicd) via the existing bitcore-node P2P infrastructure, completely independent from EVM/geth. The ZCL integration adds zclassic-bitcore-lib and zclassic-bitcore-p2p as local monorepo packages, with no impact on the Ethereum stack.

Prevents flaky CI failure where hardhat:deploy runs before geth has finished transaction indexing. Polls eth_blockNumber with retries (60x2s) before proceeding. Also adds .eslintignore for blockchain/ dir.

Replaces custom polling script with battle-tested wait-on package. Waits up to 2 minutes for geth:8545 to be ready before deploying contracts, fixing flaky CI failure (ProviderError: transaction indexing is in progress).

Hey @lelonex , thanks for the PR! Before I can even consider this work, please review the CONTRIBUTING.md doc, specifically the part about commit signing. I can't merge this PR until all your commits are signed & verified.

Also, in keeping with the pattern of this repo, please rename zclassic-bitcore-lib and zclassic-bitcore-p2p to bitcore-lib-zcl and bitcore-p2p-zcl.

Lelonex added 4 commits May 1, 2026 08:52

fix(zclassic-bitcore-p2p): use local file reference for zclassic-bitc…

76e6e31

…ore-lib, regenerate lock file Resolves CI failure: npm ci could not find zclassic-bitcore-lib in registry. Changed dependency from npm semver to file:../zclassic-bitcore-lib (local monorepo package).

fix(bitcore-node): add zclassic-bitcore-lib and zclassic-bitcore-p2p …

6f4f34c

…as local dependencies Required by src/providers/libs/index.ts at runtime. Both resolved as file: references to local monorepo packages.

Lelonex added 2 commits May 1, 2026 17:29

fix(crypto-rpc): wait for geth readiness before hardhat deploy

2344e7a

Prevents flaky CI failure where hardhat:deploy runs before geth has finished transaction indexing. Polls eth_blockNumber with retries (60x2s) before proceeding. Also adds .eslintignore for blockchain/ dir.

fix(crypto-rpc): use wait-on to wait for geth before hardhat deploy

4425065

Replaces custom polling script with battle-tested wait-on package. Waits up to 2 minutes for geth:8545 to be ready before deploying contracts, fixing flaky CI failure (ProviderError: transaction indexing is in progress).

feat(zclassic): Add Zclassic (ZCL) support by lelonex · Pull Request #4152 · bitpay/bitcore · GitHub

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feat(zclassic): Add Zclassic (ZCL) support - #4152

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feat(zclassic): Add Zclassic (ZCL) support by lelonex · Pull Request #4152 · bitpay/bitcore · GitHub

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feat(zclassic): Add Zclassic (ZCL) support - #4152

feat(zclassic): Add Zclassic (ZCL) support#4152lelonex wants to merge 6 commits intobitpay:masterbitpay/bitcore:masterfrom lelonex:submit/zcl-bitcorelelonex/bitcore:submit/zcl-bitcoreCopy head branch name to clipboard

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lelonex commented May 1, 2026

Summary

Changes

New Packages

Modified Packages

Technical Details

Testing

References

Uh oh!

lelonex commented May 1, 2026

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kajoseph commented May 1, 2026

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This branch has not been deployed

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feat(zclassic): Add Zclassic (ZCL) support#4152
lelonex wants to merge 6 commits into
bitpay:masterfrom
lelonex:submit/zcl-bitcore