MultiChain Developer Q&A - Recent questions tagged public-key

Cant save public key string on a stream

Thu, 03 Feb 2022 09:16:44 +0000

I'm trying to save a public key string to stream named 'publicKeys', but after the transaction receives any confirmations it turns to null.and txid changes

Inside the stream key it is stored as JSON before it turns "json": null (items quantity remains the same) ->

{

"data": {

"json": {

"publicKey": "-----BEGIN PUBLIC KEY-----\\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLZSCeZqOuZ4cwLEaOgsZa5CJC\\ndjer1xpthZITnAJvXeu1SlFwev0/W182ZqOMHXqHxFYtw4OPGMSUebKoRMqDAa//\\nddm2SfzeEtP4bloYNhQT0KVGUJqgRclt5u0wPik/Sm1eia11ZPnF8j3geXIu42yd\\n1jBO0u2QOuZ2aj3d9QIDAQAB\\n-----END PUBLIC KEY-----\\n"

}

Chain connection to html wallet

Tue, 05 Feb 2019 22:59:13 +0000

I've had relative success setting up multichain on several nodes.. the cli working wonderfully. Can someone point me in the right direction to building a online wallet similar to what sonm/waves which utilizes multichain... I'm guessing it's to do with rpc-json

https://market.sonm.com/ https://client.wavesplatform.com (as examples)

I can't the this process How to create a MultiChain private key

Thu, 10 Jan 2019 06:37:20 +0000

https://www.multichain.com/developers/address-key-format/

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3. Different from bitcoin: Add the first version byte from the private-key-version blockchain parameter to the start of the private key. If it is more than one byte long, insert each subsequent byte of it after every floor(33/len(private-key-version)) bytes of the key. For example with 8025B89E:
80B69CA8FFAE36F11A25D445625E35BF6AC5B87D6642DDBE470DD39EE7934291B2000D7801

4. Calculate the SHA-256 of the extended private key:
742D5B3C59BB25F077AACB33D5770AAE22FD5639E8F9A7742BADEF84BCDFB4CC

5. Calculate the SHA-256 hash of the previous SHA-256 hash:
4FBB9708A0B5F2F5AC384CAC22C69CCE3F7DCE6166DE63B5AFE35E5D59767F18

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first, I change the 3 value (80B69CA8FFAE36F11A25D445625E35BF6AC5B87D6642DDBE470DD39EE7934291B2000D7801) to binary.

the binary value is 10000000101101101001110010101000111111111010111000110110111100010001101000100101110101000100010101100010010111100011010110111111011010101100010110111000011111010110011001000010110111011011111001000111000011011101001110011110111001111001001101000010100100011011001000000000000011010111100000000001

second, I change the binary value to SHA256 hash

the result is 3E14E86F9E3895DD169ECA62444564D2E82CA25B7AEA0E0D650045967D49B9A6

I can't get the value 742D5B3C59BB25F077AACB33D5770AAE22FD5639E8F9A7742BADEF84BCDFB4CC

Can you tell me that how to I get the value 742D5B3C59BB25F077AACB33D5770AAE22FD5639E8F9A7742BADEF84BCDFB4CC. ?

I want the process changed from private key to public key.

Fri, 14 Dec 2018 06:52:39 +0000

I refer to https://www.multichain.com/developers/address-key-format/.

but i don't understand this step

Start with a raw private ECDSA key:
283D01856115B7970B622EAA6DAFF2B9ECE30F1B66927592F6EA70325929102B
Take the corresponding public key generated with it, which can be in compressed or uncompressed format. The uncompressed version contains 65 bytes, consisting of 0x04, 32 bytes for the X coordinate and 32 bytes for the Y coordinate. The compressed version contains 33 bytes, consisting of 0x02 (Y is even) or 0x03 (Y is odd), followed by 32 bytes for the X coordinate. Below is a compressed example:
0284E5235E299AF81EBE1653AC5F06B60E13A3A81F918018CBD10CE695095B3E24

and i have a three step but i get the different value

Take the corresponding public key generated with it, which can be in compressed or uncompressed format. The uncompressed version contains 65 bytes, consisting of 0x04, 32 bytes for the X coordinate and 32 bytes for the Y coordinate. The compressed version contains 33 bytes, consisting of 0x02 (Y is even) or 0x03 (Y is odd), followed by 32 bytes for the X coordinate. Below is a compressed example:
0284E5235E299AF81EBE1653AC5F06B60E13A3A81F918018CBD10CE695095B3E24
Calculate the SHA-256 hash of the public key:
1C72D90868DBCD0252A54EFFB25FB535B4C89B67D57B75FD88465C5F173DCAB5

i get the 48ED57E20708C7392AE5DBA73776D0F91A42F87CD82FE4411ED4BA37260402ED not 1C72D90868DBCD0252A54EFFB25FB535B4C89B67D57B75FD88465C5F173DCAB5

How are public keys stored in a wallet?

Wed, 12 Dec 2018 07:54:37 +0000

Hello,

I have a multiple questions about how MC stores addresses in the wallet:

1. Are public address are encrypted before being save in a wallet? or does anyone with physical access to the node can view the addresses.

2. If the wallet folder is cleared inside the node, would the node's wallet be emptied and would continue to work? or would it crash and stop working? because in other blockchain, you can just clear your wallet if necessary by just deleting the keystores.

Thanks in advance, and keep up the good work!

encryption using multichain public key

Thu, 11 Oct 2018 10:54:41 +0000

I want to encrypt files (.pdf, .jpeg, .txt etc) using my multichain wattet address public key.

While retrieving those files (which are encrypted), I want to decrypt using my multichain wallet address private key.

HOW CAN I DO It??

Can you grab the wallet address of the second server without first having to connect to a chain?

Mon, 24 Sep 2018 20:41:46 +0000

Hello,

In the 'Getting Started' guide, 2. Connecting to a blockchain states that after the second server runs multichaind chain1@[ip-address]:[port], you'll be shown a message containing an address in the node's wallet.

1. Is there anywhere else we can get the node's wallet address, without having to try to connect to a chain? The api commands I see all require something like multichain-cli [chain name] getaddresses

2. Out of curiosity, is the node's wallet address the server's public key?

Thank you!

Is it possible to extract the ECDSA public key from Multichain's public key?

Thu, 09 Aug 2018 12:27:17 +0000

The documentation at https://www.multichain.com/developers/address-key-format/ only describes how the private key is derived from ECDSA private key. But we have a scenario where we would like to use the ECDSA public key of the user (for either signing or encryption). Assuming we are able to retrieve the public key, is it possible to derive the ECDSA public key?

How to derive public key of wallet address?

Thu, 14 Jun 2018 12:42:13 +0000

Hi,

How can I get the public key for a wallet address? The purpose is I want to encrypt something using the recipient's public key which he can presumably decrypt since he has his private key.

I can see that getaddresses api call with verbose=true shows the pubkey for each address, but this is only for addresses stored in the current node's wallet. What if the address is from another node?

Thanks