Use BlockCodec instead of CodecCode #40
Description
Update to use https://github.com/multiformats/js-multiformats/blob/master/src/codecs/interface.ts#L23 instead of multicodec.CodecCode
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Update to use https://github.com/multiformats/js-multiformats/blob/master/src/codecs/interface.ts#L23 instead of multicodec.CodecCode