I need to validate Tezos addresses and have arrived at the following prefixed base 58 regular expressions for wallet and contract addresses.





Are these regexes sufficient, or could something like a KT2 or tz4 address ever be introduced into the protocol?

1 Answer 1


Transaction rollups coming with the Jakarta protocol will introduce new addresses with prefixes (txr1, tz4, and txi). And the K protocol will also introduce a new ones scr1, etc.

You can find all the prefixes here: https://gitlab.com/tezos/tezos/-/blob/master/src/lib_crypto/base58.ml#L348 https://gitlab.com/tezos/tezos/-/blob/master/src/proto_alpha/lib_protocol/tx_rollup_prefixes.ml#L33

Also, something to have in mind is that the regex is not enough to validate the address. It uses base58check encoding, which includes a checksum at the end of the address.

  • very informative, thank you. would any of these other adresses ever be able to hold FA12 or FA2 tokens in a way that is user controllable? it seems like the tz4 layer 2 address would be a candidate for this, will they be indistinguishable for the tz1,tz2,tz3 layer 1 addresses when they eventually interact with existing contracts?
    – 0x10
    Jun 27, 2022 at 7:15
  • 1
    They are distinguishable, tz4 will have a new type tx_rollup_l2_address. Jun 27, 2022 at 10:44

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