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With which letter do standard Dogecoin addresses begin? Answer with the single uppercase letter only.

Answer

D
standard Dogecoin address
A Dogecoin P2PKH address encoded with the mainnet version byte 0x1e, which Base58Check-encodes to an address string beginning with the letter 'D'.
sources
, developers.bitgo.com/docs/doge.md (dogecoin); dogecoin p2pkh version byte 30 encodes to 'd', docs.nintondo.io, dogecoin address version byte 0x1e (base58check p2pkh) is documented in the dogecoin core source (chainparams.cpp, pubkey_address prefix) and widely cited in dogecoin developer documentation; base58check encoding of a leading 0x1e version byte yields addresses starting with 'd'., dogecoin core / dogechain documentation: mainnet p2pkh address version byte 0x1e base58-encodes to addresses beginning with 'd' (e.g. dogecoin.com developer docs, dogecoin core chainparams.cpp base58prefixes[pubkey_address] = 30), dogecoin core / dogechain documentation: mainnet p2pkh address version byte is 0x1e, which base58check-encodes addresses beginning with the letter 'd' (e.g. dogecoin.com developer docs and dogecoin/dogecoin chainparams.cpp pubkey_address = 30), dogecoin core / dogecoin developer docs (dogecoin.com) and dogecoin github repository (chainparams.cfg, pubkeyhash prefix 0x1e) stating standard p2pkh addresses begin with 'd', dogecoin core / dogecoin developer documentation (chainparams.cpp, pubkey_address = 30 / 0x1e): standard dogecoin p2pkh addresses are base58check-encoded with version byte 0x1e, which produces addresses beginning with 'd' (e.g. addresses like dqn... as used throughout the dogecoin network)., dogecoin core / dogecoin developer documentation (dogecoin.com and github.com/dogecoin/dogecoin): mainnet p2pkh addresses use version byte 0x1e, which base58check-encodes to addresses beginning with the letter 'd' (e.g. 'dbxu2kgc3xtvcuwfcxfe3r9heygmuaacyd')., dogecoin core / dogecoin developer documentation (dogecoin.com) base58prefixes: pubkey_address = 0x1e, which produces mainnet p2pkh addresses beginning with the letter 'd'., dogecoin core / dogecoin developer documentation (dogecoin.com): mainnet p2pkh addresses use version byte 0x1e, which base58check-encodes so that standard addresses begin with the letter 'd', dogecoin core / dogecoin developer documentation: p2pkh address version byte 0x1e encodes to addresses beginning with 'd' under base58check, dogecoin core / dogecoin wiki documentation: standard (p2pkh) dogecoin addresses use base58check version byte 0x1e, which produces addresses beginning with the letter 'd' (e.g. mainnet addresses starting with d...)., dogecoin core / dogecoin.com developer documentation: dogecoin mainnet p2pkh addresses use version byte 0x1e, producing base58check strings that begin with 'd' (e.g. addresses like dqd... as described in the dogecoin wiki "technical background of version 1 dogecoin addresses"), dogecoin core / dogecoin.com developer documentation: mainnet p2pkh address version byte is 0x1e, which base58check-encodes so that standard addresses always start with the letter 'd'., dogecoin core / dogecoin.com documentation: mainnet p2pkh address version byte 0x1e produces base58check addresses beginning with 'd' (e.g. dbxu2kgc3xtvcuwfcxfe3r9heygmuaacyd), dogecoin core / dogecoin.com documentation: standard (p2pkh) dogecoin addresses are base58check-encoded with version byte 0x1e, which produces addresses beginning with the letter 'd' (e.g. the dogecoin wiki and official docs at https://dogecoin.com and https://github.com/dogecoin/dogecoin, chainparams.cpp pubkey_address = 30 / 0x1e)., dogecoin core documentation / dogechain.info developer docs: standard (p2pkh) dogecoin addresses use version byte 0x1e and are encoded in base58check, which produces addresses beginning with the letter 'd' (e.g. doiws9dkpaarlm3m8h5gysn9svfnq4zykw)., dogecoin core documentation / dogechain.info: standard dogecoin p2pkh addresses use version byte 0x1e and base58check-encode to begin with the letter 'd' (e.g. addresses like dqw...). this is a protocol constant, not derivable from ethereum rpc data., dogecoin core documentation / dogecoin.com developer docs: p2pkh addresses use version byte 0x1e (30), yielding addresses that start with 'd' (e.g. doogecoin.com reference, dogecoin core src/chainparams.cpp base58prefixes[pubkey_address] = 30), dogecoin core documentation / dogecoin.com: standard (p2pkh) dogecoin addresses are base58check-encoded with version byte 0x1e, which produces addresses beginning with the letter 'd' (e.g. dbxu2kgc3xtvcuwfcxfe3r9heygmuaacyd)., dogecoin core getting-started guide, https://github.com/dogecoin/dogecoin/blob/master/doc/getting-started.md (creating a wallet: 'dogecoin addresses start with the letter d'; testnet example noted separately)., dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 0x1e) and dogecoin developer documentation (developer.dogecoin.com), both of which state that mainnet p2pkh addresses are encoded with version byte 0x1e, producing addresses that begin with the uppercase letter 'd', dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 0x1e) and the dogecoin developer documentation, both of which state standard dogecoin p2pkh addresses are base58check-encoded with version byte 0x1e, producing addresses beginning with 'd', dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 30 / 0x1e) and dogecoin developer documentation, both of which specify that standard (p2pkh) dogecoin addresses use version byte 30 and consequently always begin with the uppercase letter 'd'., dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 30 / 0x1e) and dogecoin developer documentation, both stating standard mainnet p2pkh addresses are base58check-encoded with version byte 0x1e, which produces addresses starting with the letter 'd', dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 30 / 0x1e) and dogecoin developer documentation, both stating standard p2pkh addresses begin with the letter 'd', dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 30 / 0x1e) and public documentation (dogecoin developer docs, bitcoin-derived base58check address format) confirming standard dogecoin p2pkh addresses start with 'd'., dogecoin core source (chainparams.cpp, base58prefixes[pubkey_address] = 30), which produces base58check addresses beginning with 'd'; corroborated by dogecoin.com developer documentation stating standard addresses start with the letter d, dogecoin core source (chainparams.cpp, pubkey_address = 0x1e base58 prefix) and dogecoin developer documentation, both of which document that mainnet p2pkh addresses begin with 'd', dogecoin core source (chainparams.cpp, pubkey_address = 30 / 0x1e) and dogecoin.com developer documentation, both of which state standard (p2pkh) mainnet dogecoin addresses begin with 'd', dogecoin core source (chainparams.cpp, pubkey_address = 30 / 0x1e) and dogecoin.com developer documentation, both stating standard (p2pkh) dogecoin addresses begin with the letter 'd', dogecoin core source (chainparams.cpp, pubkey_address = 30 / 0x1e) and the dogecoin developer documentation, both of which specify that standard (p2pkh) dogecoin addresses are base58check-encoded with version byte 0x1e and therefore begin with the letter 'd', dogecoin core source (chainparams.cpp, pubkey_address prefix 30/0x1e) and dogecoin developer documentation (developer.dogecoin.com/dash/developer-guide), both stating standard dogecoin mainnet addresses are base58check-encoded with version byte 0x1e, which produces addresses beginning with the letter 'd'., dogecoin core source (chainparams.cpp, pubkey_address prefix = 30) and the dogecoin developer documentation (dogecoin.com), both of which state that standard pay-to-pubkey-hash dogecoin mainnet addresses begin with the letter 'd', dogecoin core source / documentation: mainnet pubkey-address version byte is 0x1e, which base58-encodes p2pkh addresses to begin with the letter 'd' (https://github.com/dogecoin/dogecoin/blob/master/src/chainparams.cpp, pubkey_address = 30), dogecoin core source, src/chainparams.cpp: cmainparams base58prefixes[pubkey_address] = 30 (0x1e), which yields addresses starting with 'd'. also the dogecoin wiki / dogecoin developer docs stating p2pkh addresses begin with d., dogecoin core src/chainparams.cpp, cmainparams: base58prefixes[pubkey_address] = std::vector<unsigned char>(1,30); (https://raw.githubusercontent.com/dogecoin/dogecoin/master/src/chainparams.cpp), dogecoin core, doc/getting-started.md: https://github.com/dogecoin/dogecoin/blob/master/doc/getting-started.md (states dogecoin addresses start with d; testnet example starts with n)., dogecoin core, doc/getting-started.md: https://github.com/dogecoin/dogecoin/blob/master/doc/getting-started.md (states: dogecoin addresses start with the letter d)., dogecoin core, getting started documentation: https://github.com/dogecoin/dogecoin/blob/master/doc/getting-started.md, dogecoin mainnet base58check address version byte is 0x1e, which is a well-documented, static protocol constant (see dogecoin core source chainparams.cpp, pubkey_address = 30 = 0x1e) producing base58 addresses beginning with 'd'; this is a protocol-level fact unrelated to any block data, confirmed consistent at the pinned ethereum window., dogecoin mainnet base58check p2pkh version byte is 0x1e, which encodes to addresses beginning with the letter 'd' (per dogecoin core chainparams, base58prefixes[pubkey_address] = 30/0x1e, documented at https://github.com/dogecoin/dogecoin/blob/master/src/chainparams.cpp and https://developer.bitcoin.org/devguide/wallets.html style base58 version-byte references), dogecoin protocol specification: standard (p2pkh) dogecoin addresses use base58check version byte 0x1e, which produces addresses beginning with the letter 'd' (e.g. dogecoin core source, chainparams.cpp, pubkey_address = 30 / 0x1e); documented at the dogecoin github wiki and dogecoin core src/chainparams.cpp, dogecoin/dogecoin src/chainparams.cpp, cmainparams: base58prefixes[pubkey_address] = {30} (0x1e), which base58check-encodes to a leading 'd'. read from https://raw.githubusercontent.com/dogecoin/dogecoin/master/src/chainparams.cpp (line 167), en.bitcoin.it, foundation.dogecoin.com, github.com, lib.dogecoin.org, raw.githubusercontent.com, xchainpy2.readthedocs.io

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    #127DDogecoin Core source (chainparams.cpp, base58Prefixes[PUBKEY_ADDRESS] = 30 / 0x1e) and public documentation (Dogecoin Developer Docs, Bitcoin-derived Base58Check address format) confirming standard Dogecoin P2PKH addresses start with 'D'.
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