Merge pull request #647 from helium/pevm/audit-55

add audit for var 55

audit/var-55.md

+# Chain Variable Transaction 55
+
+## Changes
+
+This transaction updates the Helium staking keys and allows Syncrob.it to onboard new Hotspots.
+
+## Version threshold
+
+None
+
+## Transaction
+
+```
+[{732336,
+  [{blockchain_txn_vars_v1_pb,
+       [{blockchain_var_v1_pb,"staking_keys","string",
+            <<33,1,37,193,104,249,129,155,16,116,103,223,160,89,196,
+              199,11,94,109,49,204,84,242,3,141,250,172,153,4,226,
+              99,215,122,202,33,1,90,111,210,126,196,168,67,148,63,
+              188,231,78,255,150,151,91,237,189,148,99,248,41,4,103,
+              140,225,49,117,68,212,132,113,33,1,81,215,107,13,100,
+              54,92,182,84,235,120,236,201,115,77,249,2,33,68,206,
+              129,109,248,58,188,53,45,34,109,251,217,130,33,1,251,
+              174,74,242,43,25,156,188,167,30,41,145,14,91,0,202,
+              115,173,26,162,174,205,45,244,46,171,200,191,85,222,
+              98,120>>}],
+       0,
+       <<48,69,2,33,0,241,184,12,168,2,235,127,30,22,79,206,12,
+         22,58,85,142,156,225,163,212,114,182,151,60,206,217,205,
+         201,28,196,150,28,2,32,125,174,234,211,243,104,79,87,
+         217,150,27,78,140,44,172,170,207,232,87,205,39,247,244,
+         111,140,143,95,249,189,130,145,194>>,
+       <<>>,<<>>,[],[],55,[],[],[]}]}]
+```
+
+## Acceptance block
+
+732336
+
+
+## Acceptance block time
+
+Tue Feb 23 12:10:22 AM UTC 2021