Create a map from array with kf providing keys, values are array elements.

Create a map from array with kf providing keys, values are pointers to array elements.

Use errors.Join when upgrading to Go 1.20.

NewEpochTicker creates a ticker that sends the epoch index on the channel C at the start of the epoch.

Checks if the string is a valid hex string and pad it to the given length (even number).

Transform signature transforms [R || S || V - 27] to [V || R || S].

Transform signature to be used by go-ethereum crypto.SigToPub: transforms [V || R || S] to [R || S || V - 27] No checks are performed, we assume that signature array has length 65.