diff --git a/pureboot/pureboot.cpp b/pureboot/pureboot.cpp
index 3431762..93be716 100644
--- a/pureboot/pureboot.cpp
+++ b/pureboot/pureboot.cpp
@@ -37,10 +37,11 @@ constexpr auto off = avr::irq::guard_policy::unused;
 
 constexpr std::uint8_t ack = '+';
 
-// Per-chip personality, from the chip database: the clocks the dogfood
-// boards run (16 MHz crystal on the mega, calibrated RC on the tinies) and
-// the device signature (compile-time data — the tiny13A cannot even read its
-// signature row from code).
+// Per-chip personality: the clocks the dogfood boards run (16 MHz crystal on
+// the mega, calibrated RC on the tinies). The device signature comes straight
+// from the chip database (avr::hw::db.signature) — compile-time data is the
+// only universal source, since the tiny13A cannot even read its signature row
+// from code.
 consteval avr::hertz_t clock()
 {
 	if (avr::hw::db.name == "ATtiny13A")
@@ -50,15 +51,6 @@ consteval avr::hertz_t clock()
 	return 16_MHz;
 }
 
-consteval std::array<std::uint8_t, 3> signature()
-{
-	if (avr::hw::db.name == "ATtiny13A")
-		return {0x1e, 0x90, 0x07};
-	if (avr::hw::db.name == "ATtiny85")
-		return {0x1e, 0x93, 0x0b};
-	return {0x1e, 0x95, 0x0f};
-}
-
 using dev = avr::device<{.clock = clock()}>;
 
 // Geometry: the resident loader owns the top 512 bytes of flash; the word
@@ -84,9 +76,9 @@ inline constexpr std::array<std::uint8_t, 12> info_data = {
     'P',
     'B',
     1, // magic, protocol version
-    signature()[0],
-    signature()[1],
-    signature()[2],
+    avr::hw::db.signature[0],
+    avr::hw::db.signature[1],
+    avr::hw::db.signature[2],
     static_cast<std::uint8_t>(page),
     base & 0xff,
     base >> 8, // app flash ends here; resident loader base