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self-authenticating
self-authenticating adj. 
/ˌsɛlfˌɔˈθɛn(t)əˌkeɪdɪŋ/, /ˌsɛlfˌɑˈθɛn(t)əˌkeɪdɪŋ/ that is or may be considered valid, true, or authentic without need for or reference to external authority; (later also) that affirms or enhances one's sense of self.
Brit. /ˌsɛlfɔːˈθɛntᵻkeɪtɪŋ/
, /ˌsɛlfɔːˈθɛntᵻkeɪtɪŋ/U.S. /ˌsɛlfəˈθɛn(t)əˌkeɪdɪŋ/
, /ˌsɛlfəˈθɛn(t)əˌkeɪdɪŋ//ˌsɛlfˌɔˈθɛn(t)əˌkeɪdɪŋ//ˌsɛlfˌɑˈθɛn(t)əˌkeɪdɪŋ/ΚΠ
1834 N.Y. Spectator 23 Apr. This charge..is totally disproved and annihilated by the far more enlightened and self-authenticating testimony of Mr. Gallatin.
1935 H. H. Farmer World & God i. ix. 158 Our interest is in the Christian experience of God as personal, which in the nature of the case must be self-authenticating.
1998 Guardian (Nexis) 25 Jan. To be an American is a state of being which is automatically self-authenticating, even when angst-ridden.
2005 P. R. Rice Electronic Evid. vi. 247 Such trade inscriptions on e-mail messages have been held to be self-authenticating.
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