various method of polka sign
this code is some examples for how to sign offline.
txByCustSign.ts is the best way to sign off line. and the payload can be construct repeatedly. this code is refer to the polka issue 1421
txBySignner.ts is refer to the signer tool. it can change the way to sign freely and it's so simple
if you don't mind using heavyweight lib. the package https://github.com/paritytech/txwrapper may be a good choice also
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