Questions tagged [schnorr-signatures]
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39
questions
10
votes
1answer
410 views
Musig Signature Interactivity
2 Questions:
Why is Musig signing always interactive?
Let's say I have a Musig wallet where keys are stored in secure locations with no internet access. What are some methods to sign from these ...
3
votes
1answer
120 views
Would a Schnorr PubKey be a different length than a Taproot PubKey like P2WPKH and P2WSH?
A P2WPKH PubKey is shorter than a P2WSH PubKey. Would this also be the case that a Taproot PubKey is larger than a Schnorr PubKey?
If so, wouldn't people be incentivised to use the Schnorr PubKey and ...
2
votes
1answer
80 views
how difficult is it to generating an ECDSA (or Schnorr) signature with a certain number of leading zeros?
If both the public key and the private key are known ahead of time (public knowledge), and the goal is to choose a message/nonce that generates a signature with, for example, a certain number of ...
6
votes
1answer
415 views
Will Schnorr Multi-signatures completely replace ECDSA?
I stumbled upon the fact that schnorr signatures will most probably replace the current ECDSA system in a future BIP.
Is it worth learning about ECDSA or this will become obsolete/useless/confusing ...
2
votes
1answer
48 views
bip-schnorr and HD Key Derivation
Is it safe to use HD Key Derivation with bip-schnorr? The bip mentions that you should not throw away the first byte of a generated key.
It is important to not mix up the 32-byte bip-schnorr public ...
3
votes
2answers
88 views
Why is no security lost by using 32-byte public keys in Schnorr signatures instead of 33?
There is currently a discussion on the mailing list about truncating the 33rd byte from public keys when used in bip-schnorr.
Public keys are (x, y) coordinates and compressed public keys simply ...
2
votes
1answer
82 views
Why do aggregate Schnorr signatures reverse the hash and the random number
A bitcoin signature has:
z = hash(m)
Using a private key pk we can generate a signature for message m
consisting of two numbers: r (x coordinate of the random point R =
k×G) and s = (z+r⋅pk)/k. ...
2
votes
1answer
33 views
Is it cryptographically possible to have aggregate signature schemes that can improve privacy in UTXO consolidation?
My understanding of Schnorr signatures, Taproot and Graftroot and how they improve privacy in smart contracts / multi-sig is by allowing users to aggregate signatures so the individual signatures and ...
0
votes
1answer
96 views
What are the limitations for amortizing the interactive session setup of MuSig?
I'm trying to find a way to amortize the interactive session setup in the MuSig signature aggregation scheme. My motivation is to use signature aggregation between devices communicating using low ...
3
votes
1answer
188 views
Is the BCH version of Schnorr signatures compatible with taproot?
BCH is going to introduce support for Schnorr signatures on May 15th. One of the most anticipated features for Schnorr signatures on Bitcoin is the introduction of taproot constructions. Will it be ...
1
vote
0answers
39 views
Schnorr Fiat Shamir Transformation
In the Schnorr identity protocol, we can transform the interactive ZKP into a non-interactive one by replacing the role of the verifier (i.e. providing a random challenge value) with a hash function ...
3
votes
1answer
70 views
What is the current Status of major proposed BTC upgrades like Taproot, MAST, Submarine Swaps?
I have read during the last year about some very interesting BIPs or initiatives. I am not asking for their explanations, just would be great if anyone would know about their simple status as of now, ...
6
votes
2answers
136 views
How could Schnorr signatures be aggregated across the whole transaction?
I am studying the MuSig protocol and am having trouble grasping certain segments. This is my understanding thus far:
In current Bitcoin CHECKMULTISIG format, the size of the signature grows linearly ...
9
votes
1answer
462 views
When Schnorr signatures are part of Bitcoin will it be possible validate each block with only one signature validation?
In a recent talk Pieter Wuille talked about speed up verification when using Schnorr signatures and various algorithms for verifying multiple signatures.
Would it really be possible to verify one ...
2
votes
1answer
31 views
Why is the Schnorr verification formula working and actually verifying the validity of a signature?
Reading the bottom of page 2 of the Musig Paper we can find that a Schnorr Signature for a cyclic Group G of prime order p with generator g is a tuple (R,s) where
R = gr for a random secret r and
s=...
0
votes
1answer
44 views
Does a blockchain become opaque if it enable's schnorr-signatures, and require trust in the code?
When you sign a transaction with schnorr-signatures, it does not include the pubkey in the transaction data.
1)Does this mean the input addresses become unknown, aka creating a opaque blockchain ? ...
3
votes
1answer
89 views
Are sipa's standardized schnorr signatures incompatible with blind signatures?
Here, sipa proposes a standardization of schnorr signatures: https://github.com/sipa/bips/blob/bip-schnorr/bip-schnorr.mediawiki
For example, sign() returns Sig{R,s} which can be encoded with 64 ...
3
votes
1answer
41 views
Would signature aggregation reduce the largest feasible blocksize
If a Schnorr signature aggregation scheme were to be integrated into Bitcoin. Would the reduction in witness data versus non witness data (need less bytes for a signature therefore witness data usage ...
5
votes
2answers
285 views
How are scriptless scripts and taproot different?
I recently read Aaron van Wirdum's layman explanation of both scriptless scripts and taproot. I gather that both utilize the aggregation of Schnorr signatures to hide complex scripts (smart contracts) ...
11
votes
1answer
517 views
Will a Schnorr soft-fork introduce a new address format (i.e. not bech32)
When we (hopefully) soft-fork to Schnorr signatures will the address be indistinguishable from bech32 addresses?
1
vote
1answer
93 views
Can R/r in Musig be derived from only seeds and message hashes?
I am wondering if the first two roundtrips of pre-committing and then revealing R/r in MuSig signing can be moved to the keygen phase and made deterministic. That reduces the amount of messages that ...
3
votes
1answer
141 views
Schnorr batch validation speed statistics
In this question Schnorr vs ECDSA I see in the Peter Wuille's answer the following comment about Schnorr signature batch validation: "Improving verification speed, by supporting batch validation of ...
12
votes
1answer
321 views
Schnorr's batch validation
In the recent BIP about Schnorr's standardization, Pieter Wuille presents an algorithm for batch validation. In my understanding the most heavy operation is the multiplication by a scalar: to make ...
1
vote
0answers
49 views
What would UTXO consolidation look like in the public ledger with Schnorr signatures?
I am excited about the privacy and optimisations involved with moving from ECDSA to Schnorr signatures. One of the privacy improvements, as I understand it, is that you can aggregate signatures so ...
3
votes
1answer
129 views
A couple of questions on Schnorr sig
In the BIP by Pieter Wuille it is told that the key prefixed version of Schnorr signature is needed when the scheme is used in combination with BIP32's unhardened derivation. Could someone provide an ...
1
vote
1answer
91 views
Could Taproot or Graftroot enable the execution of complex scripts?
From my understanding, Taproot uses a Merkle Tree structure whose root represents the outcome of a script. That representation is in the form of a signature that may unlock the inputs associated with ...
9
votes
1answer
2k views
Schnorr vs ECDSA
I understand that Schnorr signatures provide an improvement on ECDSA in that they are a fixed 64 bytes instead of the longer ECDSA sig format, however, I don't see how this is an advantage over ECDSA ...
2
votes
2answers
203 views
How is the construction of atomic swaps improved by Schnorr?
How does the availability of Schnorr signatures improve the ability to perform cross-chain atomic swaps?
1
vote
0answers
35 views
Can you use Schnorr to sign inputs individually?
Can personA build a transaction and sign his inputs, then personB signs his and that be added into one transaction using Schnorr. Or are SIGHASHes still needed?
4
votes
1answer
460 views
Why was ECDSA chosen over Schnorr Signatures in the inital design?
Schnorr Signatures and Signature aggregation is in the bitcoin technology roadmap. Schnorr Signatures was around the same time ECDSA is around.
Why wasnt Schnorr Signature Scheme implemented at the ...
0
votes
0answers
51 views
How do I explain Schnorr signatures and signature aggregation to 7 year old cousin?
How do I explain Schnorr signatures and signature aggregation to my 7 year old cousin?
Nathan Aw
2
votes
1answer
74 views
How do Schnorr signatures impact coin selection and the utxo growth?
Will Schnorr signature incentivise different practices in coin selection? How do they impact the utxo set in the long run?
1
vote
0answers
54 views
aggregated signatures for combining payments over a low bandwidth mesh network
Background
I'm researching how in a low bandwidth mesh network payment transactions from nodes can be combined to reduce the bandwidth used for payments. Aggregated signatures seem like a useful ...
4
votes
1answer
929 views
Replacing ECDSA (SECP256k1) with Schnorr signatures
On March 23, 2017 the Bitcoin Core team published a technology roadmap, expressing their intent to replace ECDSA (SECP256k1) with Schnorr signatures: https://bitcoincore.org/en/2017/03/23/schnorr-...
6
votes
1answer
1k views
Are Schnorr signatures quantum-computer resistant?
Here (https://bitcoincore.org/en/2017/03/23/schnorr-signature-aggregation/) it says Schnorr replaces ECDSA, we know that ECDSA can be broken by quantum computers. Can Schnorr be broken by q-computers ...
8
votes
1answer
893 views
Why was the Schnorr code removed from Bitcoin Core?
I was looking for the Schnorr implementation in Bitcoin Core and was surprised to see that it was removed on Nov 2016 (commit e06e878fd7dcc99825025fa99aedb86bc7d5c29f). Why was the source code ...
3
votes
1answer
330 views
Does the introduction of Schnorr signatures require segwit?
What is the relationship of segwit and Schnorr signatures? Is segwit a prerequisit for Schnorr signatures?
I've read that the transaction versioning of Segregated Witness would allow to just assign ...
3
votes
0answers
161 views
How does schnorr signature construct multisig functionality?
How does the multiparty schnorr signature work and enable multisig
functionality in Bitcoin?
What are its limitations? Can we construct any m of n signature?
Is there anyway to hide the signers among ...
24
votes
3answers
4k views
What are the implications of Schnorr signatures?
Adam Back (adam3us) explained in March, 2014, but it is all math. There's another short post with advantages, though.
This answer on crypto.SE claims that Bitcoin considered using Ed25519 which is ...
