No foreign runtime
Rust 2021 on toolchain 1.85.0. No C, C++, Go, Python, JavaScript, or Solidity anywhere in the node.
01Layer 1
SUM Chain
A credential is a record, not a receipt.
Summary
A Layer 1 written entirely in Rust. Records, not references, live in state. Nineteen document token families cover identity, academic credentials, equity, tax, healthcare, property, and employment, each one commitment based so the public ledger carries proof without carrying the person.
Role in the stack
Settles every other protocol in the stack. Storage economics, inference rewards, credential issuance, and corporate governance all resolve here.
Nineteen token families
SRC-20 fungibles, SRC-201 encrypted messaging, SUM-721 non-fungibles, and SRC-80X through SRC-89X for documents of record.
Governance in consensus
Proposal, tally, and execution are validator-quorum controlled at the consensus layer. There is no admin key and no council address.
Architecture
- Client Ed25519 signature
- Mempool Admission rules per subprotocol
- Proposer Round-robin, 3,000 ms
- State transition Account model, RocksDB
- Final 6 blocks deep
Specification
Values are taken from the protocol repository and from live chain parameters.
SUM Chain specification
| Consensus | Proof of Authority, round-robin proposer rotation |
|---|---|
| Block time | 3,000 ms |
| Finality depth | 6 blocks |
| Chain ID | 1 |
| Hash function | BLAKE3 |
| Signatures | Ed25519 |
| State model | Account based, balance and nonce |
| Persistence | RocksDB |
| Networking | libp2p gossipsub, mDNS local discovery |
| Contracts | Symvasi, compiled to WASM, executed by sumc-runtime |
| Native currency | Koppa (Ϙ), 9 decimals |
| Max transactions per block | 1,000 |
| Validator selection | Epoch based, stake weighted |
| RPC | JSON-RPC over HTTPS at rpc.sumchain.io, Ethereum and SUM method sets |
| License | MIT or Apache-2.0 |
Endpoints and source
- sumchain.io app
- Public RPC documentation doc
- Explorer app
- Source repo