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A core primitive of Ethereum and other cryptocurrencies is the ability to sign data that can be verified by anyone. In Bitcoin you sign a transaction saying you want to give Sally 4 bitcoin.
If you go to ecrecover-example on github for the full codebase.
These rules make the address lower-case, trim leading zeroes, shorten runs of zero segments (e.g.
:0000:) as much as possible but not a single segment, and place the compressed zeros as far to the left as possible. Because of the complexity of the IPv6 address format, this test tool can help you avoid a permutation of the correct structure.
IT professionals who are planning for their IPv6 deployment can use the IPv6 test tool to pre-check i Pv6 addresses and confirm that their format is valid.
IETF publication RFC 5592 "A Recommendation for IPv6 Address Text Representation" describes a preferred text representation for an IPv6 address.