Serialize transaction before sending #54

Job	Run time
Prepare	8s
Integration tests - stable toolchain (26_0)	1m 33s
Integration tests - stable toolchain (25_2)	1m 36s
Docs - stable toolchain (recent)	20s
Test - stable toolchain (minimal)	35s
Integration tests - stable toolchain (25_1)	1m 5s
Test - stable toolchain (recent)	34s
Integration tests - stable toolchain (25_0)	49s
Integration tests - stable toolchain (24_2)	1m 23s
Integration tests - stable toolchain (24_1)	1m 33s
Integration tests - stable toolchain (24_0_1)	48s
Integration tests - stable toolchain (23_2)	1m 9s
Integration tests - stable toolchain (23_1)	1m 26s
Integration tests - stable toolchain (23_0)	1m 25s
Integration tests - stable toolchain (22_1)	51s
Integration tests - stable toolchain (22_0)	1m 27s
Integration tests - stable toolchain (0_21_2)	1m 22s
Integration tests - stable toolchain (0_20_2)	47s
Integration tests - stable toolchain (0_19_1)	1m 19s
Integration tests - stable toolchain (0_18_1)	1m 24s
Integration tests - stable toolchain (0_17_1)	1m 26s
Docs - nightly toolchain (recent)	44s
Test - nightly toolchain (minimal)	42s
Lint - nightly toolchain (recent)	37s
Test - nightly toolchain (recent)	41s
	25m 44s

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