when i send money, i do a transaction i will the reciver to see the money is from me (i mean i will sign my account)

really no other solution?
thanks for any ideea

i still need help with this, thanks

i know blockchain, not really like - dont exist any other software, protocol, idk ?

i will start a bussines and will need to send multiple payment (to many bitcoin account) - SAME amount

I NEED SIGN my account with a message and with my site link if possible.

Which bitcoin software allow this, whats the best to use? - I will send, if possible with less fees

yes, i still need help

crazy-pilot  metdode to simple import with import wallet function - not work "error decryptin wallet. please check password"
probable because i have other password for the new blockchain account in which i will import the wallet backup

so again ... i have the identifier and the long private key encrypted ,looks like
iaZDYzeqTuZdxHXGV6XXXXXXAo0QYthIMnTlec1QJM4wHqpnn8AcX6GBgV1nK/oa75Bi3BCPA5bF6xjWAgJi A==

till now i cant import in bockchain (say invalid key format) .. multibit has option to import only file, not a key, bitcoin armory import only paper wallet, not key ... electrum crash/ close without any response when i try using restore an existing wallet from a seed option

please help me with any working ideea

sorry first i have not understand
now i have copy all the entire text (starting with "{ guid" and ending with "}" in Import Wallet section but say incorect password - so this cant be used
i need somehow to import the private key first

wow, yes, i find the identifier - but still not remember my first password, because was a random generated long passord
i have the shared key too
and the long - as you say base coded private key - but blockchain dont accept me to add this key
now whats to do exactly. which step i need follow to can add this key?

i have the shared key, because this was together with the private key when i exported from blockchain unencrypted (and saved in my email)
first i will import again somehow to my new blockchain account, later hope i will remember my second password for tranzaction
--so please how can i import in blockchain if the site Error importing private key: Unknown Key Format

i dont changed anything in debugging but i cant add this key to blockchain - Error importing private key: Unknown Key Format
how can i add ?

this is the full lenght private key which i saved ...

i cant import in bockchain .. multibit has option to import only file, not a key, bitcoin armory import only paper wallet, not key ... electrum crash/ close without any response when i try using restore an existing wallet from a seed option
any other ideea?

iaZDYzeqTuZdxHXGV6XXXXXXAo0QYthIMnTlec1QJM4wHqpnn8AcX6GBgV1nK/oa75Bi3BCPA5bF6xjWAgJi A==

this is my key - i changed some letter with X

which client i can try using to import my private key?
and if i import succesfully will be can send money if my wallet = key was double encrypted?

please help me-
i am very unlucky

i have format my pc and i lost my saved identifier, password and second password (i used random hard password and second password, so i dont remeber it)

all what i have saved in my email is the private key

what can i do now? i wanted to import it to blockchain but the site say invalid key format, probable because i used second password???

please help me, for me this 3 btc loss is too big