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Relativistic jets are thought to play a key role on the formation of massive galaxies and supermassive black holes. Radio and X-ray observations provide the most direct probes of SMBHs accretion mechanisms and jets physics. However currently there is a dearth of radio sources at z and amp amp amp gt =7 which in turn are a key missing population for future 21 cm absorption studies well within the epoch of reionization. We propose quasi-contemporary VLA/XMM observations of a new redshift-record radio source at z=7 for which archival non-simultaneous 1.4 and 3.0GHz data reveal an atypical sharply rising spectrum of index +0.6 that could be compatible with a blazar. [truncated! Please see actual data for full text]