Bitcoin Forum

One is Electrum.
it's address is start with bc1 yeah it's great and it gave you private keys
BUT. blockchain.info can't search it's transaction.

seems like bc1 address is not compatible with old wallet and system.

1. is an address start with 3 is a multi sign address?

that means you don't have full rights on you coins?

2. is an segwit address need to be a multi sign address?

3. which segwit wallet will give me the full right? (don't need others to approve)

4. if No.3 is no is that means segwit is a system that need someone to approve you transaction?

Electrum is one.  There are probably others.  I haven't built a list yet.

to have segwit addresses starting with a 3 in Electrum just follow these simple steps:

1) generate a bip39, 12 words seed on https://iancoleman.io/bip39/ (use it offline for more security)
2) on electrum choose, File -> New/Restore -> Standard Wallet -> I already have a seed -> click on "options" and choose bip39, write the seed then click next
3) on derivation path path use: m/49'/0'/0'/0

that's all. Remember to save in a safe place the seed as electrum will not show it (read below)

some wallet or exchange may not able transfer to your address?

As of version 3.0, released last month, Electrum does support Segwit!  You need to generate a new Electrum wallet for this; and if you select “Segwit wallet”, it will only give you Bech32 addresses.  If you want Bech32 addresses, then your problem is solved.  Bech32 addresses (https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki) are technically superior to old-style addresses; but they are not backward-compatible, so only people with Segwit support will be able to send you money.  I myself hope to switch to Bech32 in perhaps 6–12 months.  Future viewers of this post will see my signature showing an address which starts with “bc”.

To make Electrum give you a wallet of backward-compatible P2WPKH-nested-in-P2SH “3” addresses like the one you see now in my signature, use the following procedure, which I have tested:  (0) Generate a BIP39 seed by some other means.  I wrote a short C program for this, which I should polish up and post online; BIP 39 (https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) itself contains a list of implementations, including the Python reference implementation (https://github.com/trezor/python-mnemonic).  (1) In the new wallet dialogue, tell Electrum that you already have a seed.  (2) In the seed entry dialogue, click the button for more options and tell Electrum you’re using a BIP39 seed.  (3) In the next screen, change the derivation path to m/49'/0'/0'.  The only part which needs to be changed is the “49”.  You may refer to BIP 49 (https://github.com/bitcoin/bips/blob/master/bip-0049.mediawiki) (as to the 49, the “purpose”) and BIP 44 (https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) (for the two zeroes, “coin type” and “account”) to confirm that I am not giving you bad instructions which will send your money off into the weeds; I mention that because I’ve seen Internet posts get this part wrong.

btw shouldn't segwit supposed to reduce tx size?
8ef03ebe095927da7e2d9b51d207424a3079ad045f3a64540a1667d87d5d551d (https://blockchain.info/tx/8ef03ebe095927da7e2d9b51d207424a3079ad045f3a64540a1667d87d5d551d) compressed to compressed + compressed = 225 (bytes)
735e692ff8e7334f2d51fa6ec14c83067f35ff387be6c46f6fa42ac511fa9fd1 (https://blockchain.info/tx/735e692ff8e7334f2d51fa6ec14c83067f35ff387be6c46f6fa42ac511fa9fd1) segwit to segwit + segwit = 247 (bytes)
or the second tx input is from multisig address?

WITNESS TXIN[0] stack elements: hex=02, decimal=2
 WITNESS[0] data length (var_int), hex=47, decimal=71, data(uchar[]):  3044022027BAC51C3DF47B8C3396D5C2CAE52A272D1B4EB7C02A45465B6D071823469EE202201C349BF199C0A0CFF8F3ED88448B2B6D518EA8298C5803E333ACB8543A0088E901
 WITNESS[1] data length (var_int), hex=21, decimal=33, data(uchar[]):
  03F42E8010475E2AF03E8AE790C956AD40945FA7C57740FA839FBC6ADF89F5376C

WITNESS [0] decodes to a single sig, with R+S key, and then SIGHASH_ALL:
  ##################################################################
  ### tcls_in_sig_script.sh: decode SIG_script OPCODES from a TX ###
  ##################################################################
    47: OP_DATA_0x47:        push hex 47 (decimal 71) bytes on stack
    30: OP_SEQUENCE_0x30:    type tag indicating SEQUENCE, begin sigscript
    44: OP_LENGTH_0x44:      length of R + S
    02: OP_INT_0x02:         type tag INTEGER indicating length
    20: OP_LENGTH_0x20:      this is SIG R (32 Bytes)
        27BAC51C3DF47B8C:3396D5C2CAE52A27
        2D1B4EB7C02A4546:5B6D071823469EE2
    02: OP_INT_0x02:         type tag INTEGER indicating length
    20: OP_LENGTH_0x20:      this is SIG S (32 Bytes)
        1C349BF199C0A0CF:F8F3ED88448B2B6D
        518EA8298C5803E3:33ACB8543A0088E9
    01: OP_SIGHASHALL:       this terminates the ECDSA signature (ASN1-DER structure)

curious to see, how this is explained...

OK Thanks for the reply. that's awesome.

my next question is

is there any segwit wallet give you address start with 3 and not a multi-sig wallet and give you the private key?
seems electrum's address is not compatible with some other system.
some wallet or exchange may not able transfer to your address?

or
is there any segwit wallet allow you control a segwit paper wallet.

So I'm searching for bitcoin segwit wallet.