System Contracts

Bitgold Next predeploys a set of system contracts at genesis, at fixed addresses, covering staking, governance, and the chain’s own novel features (Multi-Lane, the shielded pool, and account abstraction). Most of the staking/governance contracts reuse Bitgold Network’s audited bytecode directly; the rest are new to Bitgold Next.

Contract	Address	Responsibility
ValidatorSet	0x0000000000000000000000000000000000001000	The active validator roster that consensus reads each epoch.
SlashIndicator	0x0000000000000000000000000000000000001001	Records downtime/missed-block behavior and drives slashing.
SystemReward	0x0000000000000000000000000000000000001002	Holds and distributes block rewards.
GovHub	0x0000000000000000000000000000000000001007	The single entry point governed contracts accept parameter changes from.
CrossChain	0x0000000000000000000000000000000000002000	Placeholder occupying Bitgold’s cross-chain address. No bridge traffic and no governance messages today; see the note below.
StakeHub	0x0000000000000000000000000000000000002002	Core staking hub: validator registration, delegation, and election bookkeeping.
StakeCredit	0x0000000000000000000000000000000000002003	Per-validator share-pool implementation (one proxy deployed per validator).
Governor	0x0000000000000000000000000000000000002004	Governance proposal lifecycle: propose, vote, determine success.
GovToken	0x0000000000000000000000000000000000002005	govBTG, the non-transferable voting-power token, minted 1:1 by StakeHub.
Timelock	0x0000000000000000000000000000000000002006	Enforces the mandatory delay between a passed vote and execution.
LaneRegistry	0x0000000000000000000000000000000000003000	Multi-Lane quotas and address routing.
AccountKeychain (precompile)	0x0000000000000000000000000000000000004000	Account abstraction key registry for authorizing, revoking, and reading delegated keys.
SignatureVerifier (precompile)	0x0000000000000000000000000000000000004001	Verifies AA signatures (secp256k1 / P256 / WebAuthn) on behalf of the AA pipeline.
ShieldedPool	0x0000000000000000000000000000000000005000	Privacy system contract covering deposit, withdraw, transfer, and atomic-call, with an embedded zk-proof verifier.
ShieldedAuthVerifier	0x0000000000000000000000000000000000005003	Auth-proof verifier used by the shielded pool.

Notes

• ValidatorSet, SlashIndicator, SystemReward, StakeHub, StakeCredit, GovToken, Governor, and Timelock are the staking/governance stack carried over from Bitgold Network, kept at the same addresses so their embedded bytecode’s internal cross-references remain valid. Governor/Timelock are recompiled with Bitgold Next’s own governance-timing constants (voting period, proposal threshold, timelock delay), which are still devnet-only values and not finalized for a public network.
• CrossChain exists purely so ValidatorSet’s epoch-update logic finds a non-empty contract at that address, mirroring a Bitgold internal check. It does not carry governance traffic on Bitgold Next.
• LaneRegistry, AccountKeychain/SignatureVerifier, and ShieldedPool/ShieldedAuthVerifier are Bitgold Next–original, with no Bitgold Network equivalent.
• AccountKeychain and SignatureVerifier are enshrined precompiles (Rust logic compiled directly into the EVM’s precompile map) rather than deployed bytecode, which is why they sit in their own reserved address band separate from the deployed system contracts above.