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Escrow contract integration #3395

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Job	Run time
test_integration	8m 36s
lint	34s
build (ubuntu-latest, 20)	47s
test_unit	1m 49s
build (ubuntu-latest, 18)	57s
build (macos-latest, 20)	1m 18s
build (macos-latest, 18)	1m 2s
build (windows-latest, 20)	2m 8s
build (windows-latest, 18)	2m 1s
create_guide	0s
coverage	0s
	19m 12s