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SignalMap is a decentralized physical infrastructure (DePIN) network that transforms smartphones into a global network of cellular signal measurement nodes. The platform creates high-fidelity, real-time maps of wireless coverage by incentivizing users to passively collect radio frequency (RF) data through a mobile application. At its core, SignalMap's architecture is built on verifiable data integrity. A native Android module sources signal strength (dBm), carrier information, and network generation (e.g., 5G, LTE) directly from the device's hardware chipset. This hardware-level sourcing makes the data inherently tamper-proof, preventing spoofed or fraudulent submissions. Each validated reading is then cryptographically signed on-device and minted as an ERC-8004 Trust Receipt on the Flow EVM blockchain. This process creates an immutable, auditable, and transparent ledger of cellular signal measurements, timestamped and geolocated. This model disrupts the traditional method of network mapping, which relies on costly and logistically complex drive-testing fleets. By crowdsourcing data collection, SignalMap provides telecom operators, IoT solution providers, and infrastructure companies with a vastly more scalable, cost-effective, and continuously updated view of their network performance. The token-incentivized model creates a powerful flywheel, encouraging network growth and data density, ultimately enabling precise identification of coverage gaps and optimization of wireless infrastructure worldwide.