Questions tagged [schnorr-signatures]

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3
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1answer
483 views

What makes cross input signature aggregation complicated to implement?

What makes cross input signature aggregation complicated to implement? Other than for design space reasons why didn't it make it into BIP-Taproot? (Key aggregation within one input can be achieved ...
4
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1answer
72 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=r+...
6
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1answer
537 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 ...
7
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2answers
545 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 ...
0
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1answer
21 views

1 of n Multisig Scriptless Scripts?

I know MuSig makes n of n multisig scriptless. However, can we also aggregate multiple internal public keys in one public key, and unlock funds using either one of the internal public keys?
43
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5answers
47k views

How do you get a Bitcoin Public Key from a Private Key

How do I, in extreme specificity, convert a given private bitcoin key into a public bitcoin key (Talk to me like I'm 5 and I have to do this step by step or the evil witch will cook me alive in her ...
10
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1answer
595 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
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1answer
88 views

Why is Public Key aggregation in MuSig described as a product of the public keys?

In the the MuSig2 paper, it is described that: Each signer randomly generates and communicates to others a nonce Ri=g^ri; then, each of them computes R=∏ni=1Ri,c=H( ̃X,R,m)where ̃X=∏ni=1Xiis the ...
2
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1answer
45 views

In MuSig-DN why not use a truly random number for the nonce instead of a pseudorandom function?

In MuSig-DN why not use a truly random number for the nonce instead of a pseudorandom function (PRF)? If the nonce space is big enough it would never be reused. This question was asked by emzy on ...
4
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3answers
433 views

What are some interesting applications of Taproot “smart contracts”?

From a strictly technical perspective, MAST makes a lot of sense. However, understanding it in the context of Taproot/Tapscript does require prior knowledge in Merkle Trees and hash functions. What ...
3
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1answer
194 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 ...
3
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1answer
91 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?
11
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1answer
2k views

What are the advantages of 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 ...
3
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1answer
76 views

Which MuSig scheme is optimal? Classic MuSig or this new MuSig-DN scheme?

Now we have two competing MuSig schemes which is better? Classic MuSig or MuSig-DN? Which use case(s) might choose classic MuSig over MuSig-DN and vice versa?
0
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1answer
34 views

How do I tweak the bip340_test_vectors to check that signature verification fails for other test vectors?

I now understand why some of the bip340_test_vectors fail signature verification. I would like to tweak these test vectors to check that signature verification fails for other test vectors. How do I ...
1
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1answer
138 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 ...
1
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1answer
113 views

I'm digging further into the open Taproot PR. Can you explain the bip340_test_vectors?

I'm digging further into the open Taproot PR. I found these bip340_test_vectors. They have secret keys, public keys, aux_rand (auxiliary randomness), message, signature and whether the signature ...
0
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2answers
256 views

The order of the generator point G used in bitcoin

Hi I was just wondering how the order of the generator point G used in bitcoin was actually calculated. From the specification listed http://www.secg.org/SEC2-Ver-1.0.pdf for secp256k1 I can see ...
2
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1answer
53 views

Who will the first adopters of Taproot be (assuming it is activated at some stage)? What incentives are there to start using it straight away?

Adoption of SegWit by users and companies after it was activated was slow. Should we expect adoption of Taproot to be slow also (assuming it is activated at some stage)? Who will the first adopters of ...
0
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1answer
50 views

Two threats to Bitcoin: Quantum Computing and Mining farm seizures - what new BIPs are needed before it is too late? [closed]

How resistant is bitcoin blockchain against physical attacks? Contrary to other consensus mechanisms, Bitcoin's PoW model is dependent on massive Mining Farms with tons of ASIIC hardware. These farms ...
3
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2answers
146 views

What are “leaf versions” in Taproot?

What are "leaf versions", when do you upgrade a version, how many versions are there and how do they differ from segwit versions?
0
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1answer
32 views

Is there already reached consensus on network upgrades like Taproot, Submarine Swaps?

I have read about some very interesting new protocol amendments. I am not asking for their explanations, but would be great if anyone explained their current status, if they are still considered to ...
0
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1answer
49 views

Schnorr without R in the challenge

I read the Schnorr and MuSig papers and stumbled over the problem that the use of deterministic nonces in multisignatures is not safe. The adversary would be able to extract the private key from the ...
7
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2answers
2k 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. Is Schnorr safe from q-computers?
3
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1answer
507 views

k selection for Schnorr signatures

So i was reading the BIP for Schnorr signatures and I couldn't find any explanation on why the simple RFC6979 Variant wasn't chosen for their nonce generation. Instead, they decided to go with their ...
2
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1answer
59 views

Is Z-man's PTLC construction implementable using libsecp256k1-zkp?

In a mailing list post Z-man details a PTLC construction which he claims is "is almost entirely a MuSig ritual". My question is whether this MusigTweak is what is called the adaptor (last argument of ...
2
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2answers
387 views

Could Taproot create larger security risks or even hinder future protocol adjustments re Quantum threats?

I am quoting here a user named "blk014" who responded to Pieter's Taproot tweets from 24JAN. I find this user's comments very interesting and would like to ask a developer expert how much of a ...
2
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1answer
54 views

Will g'root be included in the Taproot soft-fork?

G'root, which I understands as generalised Taproot, was announced a year and a half ago. I'm wondering what the development is on it and if it is part of the taproot softfork.
3
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2answers
142 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 ...
13
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1answer
603 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
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1answer
50 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 ...
2
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1answer
151 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. Then, ...
2
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1answer
145 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 ...
2
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1answer
82 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 ...
1
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1answer
109 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 ...
2
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1answer
45 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
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1answer
172 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 ...
4
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1answer
243 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 ...
13
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1answer
457 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 ...
2
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0answers
73 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
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1answer
94 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, ...
4
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1answer
615 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 ...
25
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3answers
5k 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 ...
0
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1answer
50 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
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1answer
118 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 ...
7
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2answers
409 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) ...
2
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2answers
356 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?
13
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1answer
624 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?
5
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1answer
222 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 ...
1
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0answers
61 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 ...