part of the "danger" of "pre-printed" physical coins I guess... At some point, some one other than the coin holder has had the private key... which means the coin holder has to trust that no records were ever kept.
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--input-type : Input data type, must be one of :
mini-private-key : 30 character Casascius mini private key
private-key : 32 byte ECDSA private key
private-key-wif : 33/34 byte ECDSA WIF private key
public-key : 33/65 byte ECDSA public key
public-key-sha : 32 byte SHA256(public key) hash
public-key-rmd : 20 byte RIPEMD160(SHA256(public key)) hash
address : 21 byte Bitcoin address (prefix + hash)
--input-format : Input data format, must be one of :
raw : Raw binary
hex : Hexadecimal encoded
base58 : Base58 encoded
base58check : Base58Check encoded (most common)
--output-type : Output data type, must be one of :
all : All output types, as type:value pairs, most of which
are never commonly used, probably for good reason.
mini-private-key : 30 character Casascius mini private key
private-key : 32 byte ECDSA private key
private-key-wif : 33/34 byte ECDSA WIF private key
public-key : 33/65 byte ECDSA public key
public-key-sha : 32 byte SHA256(public key) hash
public-key-rmd : 20 byte RIPEMD160(SHA256(public key)) hash
address : 21 byte Bitcoin address (prefix + hash)
--output-format : Output data format, must be one of :
raw : Raw binary
hex : Hexadecimal encoded
base58 : Base58 encoded
base58check : Base58Check encoded (most common)
--input : Specify input data on command line
--input-file : Specify file name to read for input ('-' for stdin)
--batch : Read multiple lines of input from --input-file
--ignore-input-errors : Continue processing batch input if errors are found.
--public-key-compression : Can be one of :
auto : determine compression from base58 private key (default)
compressed : force compressed public key
uncompressed : force uncompressed public key
(must be specified for raw/hex keys, should be auto for base58)
--network : Network type of keys, one of :
bitcoin
bitcoin-testnet
litecoin
litecoin-testnet
feathercoin
feathercoin-testnet
dogecoin
dogecoin-testnet
quarkcoin
quarkcoin-testnet
darkcoin
darkcoin-testnet
jumbucks
jumbucks-testnet
--fix-base58check : Attempt to fix a Base58Check string by changing
characters until the checksum matches.
--fix-base58check-change-chars : Maximum number of characters to change
(default=3)