ORCA

ORCA is a MIFARE DESFire based public transit ticketing system in use by multiple agencies in Seattle, WA.

All values on the card are big-endian, and timestamps are stored as Unix timestamp.

All data is in application IDs 0x3010f2 (main) and 0xffffff (id).

id app, File 0x7

id app, File 0xf (Card Metadata, 9 bytes)

First byte	Last byte	Length	Field description
0	3	4	Unknown
4	7	4	Serial number
8	8	1	Unknown

main app, File 0x0

main app, File 0x2 (Trips)

First bit	Last bit	Length	Field description
24	27	4	Agency
28	59	32	Timestamp
76	91	16	Coach or station number
120	134	15	Fare
136	143	8	Transaction type
272	287	16	New balance

main app, File 0x3 (Topups)

Follows the same format as trips

main app, File 0x4 (Balance)

Each record is 48 bytes

First byte	Last byte	Length	Field description
41	42	2	Card balance (cents)

main app, File 0x6

main app, File 0x7

main app, File 0xf