# Bitcoin as an Interplanetary Monetary Standard with Proof-of-Transit Timestamping

## TL;DR

This paper proposes a novel cryptographic primitive called Proof-of-Transit Timestamping (PoTT) to enable secure, tamper-evident Bitcoin transactions between Earth and Mars, addressing interplanetary communication challenges without altering Bitcoin's core protocol.

## Contribution

It introduces PoTT for interplanetary Bitcoin, integrating Delay/Disruption-Tolerant Networking and optical LEO mesh networks to enhance security and reliability in space-based financial systems.

## Key findings

- PoTT provides cryptographic, tamper-evident audit trails for interplanetary Bitcoin.
- The architecture supports long-horizon Lightning channels with planetary watchtowers.
- PoTT improves reliability and accountability in high-latency, intermittent links.

## Abstract

We explore the feasibility of deploying Bitcoin as the shared monetary standard between Earth and Mars, accounting for physical constraints of interplanetary communication. We introduce a novel primitive, Proof-of-Transit Timestamping (PoTT), to provide cryptographic, tamper-evident audit trails for Bitcoin data across high-latency, intermittently-connected links. Leveraging Delay/Disruption-Tolerant Networking (DTN) and optical low-Earth-orbit (LEO) mesh constellations, we propose an architecture for header-first replication, long-horizon Lightning channels with planetary watchtowers, and secure settlement through federated sidechains or blind-merge-mined (BMM) commit chains. We formalize PoTT, analyze its security model, and show how it measurably improves reliability and accountability without altering Bitcoin consensus or its monetary base. Near-term deployments favor strong federations for local settlement; longer-term, blind-merge-mined commit chains (if adopted) provide an alternative. The Earth L1 monetary base remains unchanged, while Mars can operate a pegged commit chain or strong federation with 1:1 pegged assets for local block production. For transparency, if both time-beacon regimes are simultaneously compromised, PoTT-M2 (and PoTT generally) reduces to administrative assertions rather than cryptographic time-anchoring.