ZOOBC / PROXCELL WORKING PAPER
ProxCell proposes a payment architecture where nearby phones confirm local commerce first, then signed net totals settle through a geographic hierarchy. The paper uses physical proximity as an attestation input and ZooBC's dual-chain design as its technical ancestor.
STATUSWorking Paper v0.1, March 2026. ProxCell is not a live payment network today.
THE CORE INSIGHT / LOCAL COMMERCE
Conventional blockchains treat every payment as a mutation of global state. ProxCell starts with a narrower question: if buyer and seller are physically together, can nearby nodes confirm the exchange while world-scale settlement happens later?
The paper's answer is a six-layer hierarchy. Speed is local, finality is deferred, and only signed net values rise through the upper layers.
01 / PHYSICAL CONTACT
The paper proposes a direct device-to-device handshake over NFC, Bluetooth Low Energy, or both. Sender and receiver sign a timestamped challenge and session nonce, creating evidence that two devices were physically near each other for that transaction. This raises the cost of remote location spoofing, but the paper still lists relay resistance and signal design as research questions.
Continue02 / LOCAL OPTIMISTIC CONFIRMATION
A nearby committee checks local state and collects a signature threshold. The paper targets millisecond confirmation for Layer 5 in-person payments, backed by a guarantee deposit. That confirmation is optimistic, not global finality. If the account lacks sufficient collateral or the payment crosses geographic layers, it follows the slower settlement path.
Continue03 / HIERARCHICAL NET TOTALS
After micro-cell deduplication at the city-district boundary, each geographic layer validates and aggregates signed totals from below. Above Layer 4, individual local transaction records do not travel upward. Cross-layer payments are the explicit exception: they settle directly at the lowest common layer that contains both parties.
Continue04 / BOUNDED FINANCIAL STATE
The proposed ledger distributes fund custodianship across nested geographic buckets. A payment contained within one bucket changes that bucket rather than one universal balance sheet. The paper argues this bounds the financial blast radius by geography. Whether the isolation holds under attack still needs formal analysis and testnet evidence.
Continue05 / PHONE-BASED EDGE
The paper describes voluntary, non-continuous mobile nodes that synchronize from recent snapshots and participate when needed. It does not eliminate infrastructure: national, continental, and global settlement layers may use dedicated servers run by institutions or independent validators. Low-density areas also need fallback behavior and activation thresholds.
Continue06 / COMPACT LOCATION COMMITMENTS
ProxCell accounts are pseudonymous key pairs in the paper. Signed co-location events can be accumulated into a Merkle tree, with only the root committed to the network. Exact coordinates are not part of that commitment. Privacy still depends on implementation details, metadata exposure, application policy, and resistance to correlation.
ContinueTHE SIX-LAYER HIERARCHY
The paper assigns settlement to the narrowest geographic layer containing both parties. Intended speed changes with scope.
Under a seven-continent deployment, the paper's pure net-settlement model reduces ordinary local activity to one signed net value per continent at Layer 0.
Important exception: a payment between parties in different geographic sub-trees is routed as an individual settlement to their lowest common layer. The seven-value statement describes aggregated local activity, not every possible payment.
PROXCELL / ZOOBC
The working paper identifies ZooBC's transaction-chain and state-archive design as the direct ancestor of its implementation path. Recent snapshots are intended to let mobile nodes avoid replaying full history. Proof of Participation informs the participation model.
That is a design relationship, not a deployed integration. ProxCell software, geo-cell consensus, payment applications, and settlement infrastructure still need implementation and testing.
PROPOSED PAYMENT FLOW
This is the paper's intended flow. It is not an available ZooBC transaction type or ProxCell application today.
Two nearby devices exchange a challenge and produce a mutually signed co-location attestation.
→A local geo-cell committee validates available state and reaches the required signature threshold.
→Local transactions are deduplicated and reduced to signed net totals as settlement rises through the hierarchy.
→Layer 0 incorporates the settlement, releases the guarantee deposit, and closes the optimistic window.
↓THE SOURCE OF TRUTH
Version 0.1 establishes the architecture and its authorship. It also asks for rigorous scrutiny before formal specification or implementation.
2dd9ba6ccf376d86348407731677f24b122f0e9c67af4c1e5a91146fc1cae662Verify document ↗BUILT FOR AFTER MAINNET
Read the paper, test its assumptions, and help turn a geo-federated consensus proposal into working infrastructure.