Update sender verification to follow what they suggested #654

Job	Run time
clippy	1m 20s
rust_tests	1m 20s
build	1m 28s
configure	1s
tests_zemu_setup	46s
build_ledger	1m 27s
test_zemu (0, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/candid.test.ts)	10m 3s
test_zemu (1, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/bls.test.ts)	4m 44s
test_zemu (2, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/protobuf.test.ts)	8m 38s
test_zemu (3, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/standard.test.ts)	5m 11s
test_zemu (4, /home/runner/work/ledger-icp/ledger-icp/tests_zemu/tests/addresses.test.ts)	4m 47s
size_nano_s	1s
build_package_flex	0s
build_package_stax	0s
build_package_nanosp	0s
build_package_nanos	0s
	39m 46s

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