refactor: remove metadata sig and use difference key branch for offset #13346

Job	Run time
pr_2_artifact	2s
Upload Event File for Test Results	8s
clippy	6m 24s
cargo check with stable	8m 38s
file licenses	10s
machete	1m 35s
test (testnet, esmeralda)	5m 57s
test (nextnet, nextnet)	10m 14s
test (mainnet, stagenet)	12m 11s
	45m 19s

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