Questions tagged [tangle]

For questions about the tangle, the directed acyclic graph which has the same function in IOTA as the blockchain has in other cryptocurrencies.

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3 views

How do I know MAM data has been published?

I am running a code to publish random data on Tangle via MAM. If I don't fetch the data at the same time, and I just want to confirm if it has been published on Tangle, how do I do that? Also, is it ...
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1answer
10 views

How to send Health Data to Tangle via MAM?

I am trying to make a project to send Health data from my phone to Tangle via MAM. For this purpose, I have made a sample file that publishes sample health data to Tangle. When I am running the code, ...
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22 views

what is the Mathematical principle of the tangle

how do i get the probability of the douple-spending?
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47 views

What is the correct way to write “Hello, World!” to the tangle?

How would a simple program look like, that, when run, writes the message Hello World to the tangle?
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33 views

Is it possible to secure the data of an IOT idevice in an ICS by using MAM?

The idea is to add IOT devices to an ICS (industrial control system), send and retrieve the data of these devices through the tangle. The data will be sent through the IOT device using MAM and be ...
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How can I get back my balance showing in my IOTA wallet?

I use IOTA Wallet Version 2.5.7 (2.5.7). I know I had 101.89800000 IOT in my wallet (my cointracking.info account confirms). I was able to log into my account, but my balance is showing 0. I tried ...
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78 views

IOTA and LoraWAN: Proof of Concept of storing data in the Tangle

I found an article here :(Link to the article) entitled "LoraWAN and IOTA: Proof of Concept of storing data in real time in the Tangle" , written by Harm van den Brink (IOTA foundation member). ...
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1answer
130 views

How to install IOTA in a small device supports LoraWAN?

I found an article here :(Link to the article) entitled "LoraWAN and IOTA: Proof of Concept of storing data in real time in the Tangle". The thing is not clear to me is that if IOTA has been ...
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2answers
78 views

How can the transactions in the Tangle be ordered temporally?

I do not understand how the IOTA Tangle DAG indicates by its structure the temporal order when two spends are on separate, independent, branches. It is possible that two transactions occur and are ...
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1answer
49 views

IOTA and Tangle relation

I used to think that IOTA is the cryptocurrency which uses the Tangle Direct Acyclic Graph. But today I spend some time on the IOTA official and there is no single appearance of the word "...
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1answer
94 views

IOTA network actual usage

My understanding is that IOTA is mostly useful to communicate data rather than to store data, given that the network undergoes periodic transaction pruning (snapshots). Is this correct? If so, is ...
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2answers
91 views

physical clock or logical clock for timestamping

Timestamps in Tangle are already mandatory and must have a value in a certain range, which seems to be between the last snapshot time (epoch 1517180400, which is GMT: Sunday, January 28, 2018 11:00:00 ...
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73 views

impact of a single double-spend to the network

I just start looking at iota, the general tangle without Coordinator. I am reading the this presentation about the consensus mechanism, where I'm confused about the impact of a single double-spend to ...
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Permanent storage of transaction Tag and signatureMessageFragment? [duplicate]

I am not able to find a clear answer. I would like to ask whether the Transaction Tag and signatureMessageFragment for Non-0 transactions are purged during each snapshot, or not? If either of them is ...
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222 views

Immutability in IOTA: How to be sure a transaction is not “removable” from Tangle?

In Bitcoin and Ethereum, the longest chain with the most proof-of-work (POW) invested in it is accepted as the true chain and used to determine balances and history on the network. Because of this, ...
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1answer
115 views

What would happen, if two different transactions with the same hash get published simultaneously?

This is related/a follow up question to "If someone were to find a Proof of Work collision, could they pin the tail of the tangle to the head?" Imagine two transactions that hash to the same value ...
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129 views

What is the blowball problem and what causes it?

According to IOTA Engineering: IRI 1.5.3 addresses the blowball problem seen on Mainnet. What exactly is the blowball problem and what causes it?
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1answer
95 views

What has been the growth rate of tangle confirmation rate until today?

I am curious to understand how the tangle has improved in terms of confirmation rate since its inception. Are there any statistics which show this? A positive growth is definitely a good sign. And if ...
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110 views

JOTA - Use of Servers

I'm using the JOTA : Library 0.9.11-SNAPSHOT API. I am using Eclipse JUnit testing for the example found at https://github.com/iotaledger/iota.lib.java/blob/master/jota/src/test/java/jota/...
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1answer
131 views

If someone were to find a Proof of Work collision, could they pin the tail of the tangle to the head?

If someone were to find a Transaction Proof of Work collision, would it be possible to pin the tail of the tangle to the head and create an infinite loop? IE. Create a self-referential tangle segment ...
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177 views

With IRI version 1.5.2, how does the prevention of lazy tip selection change the tangle's partition tolerance?

One of the features of IOTA is that sub-tangles can be constructed and then attached to to the main tangle in the future. With IRI version 1.5.2, how does the prevention of lazy tip selection change ...
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1answer
86 views

In IRI version 1.5.2, is the prevention of lazy tip selection a further entrenchment of the Coordinator?

For background, please read: https://blog.iota.org/coming-soon-iri-1-5-2-52114ca67a70 Under the hood, while doing validation, IRI will now remember the most recent milestone referenced by each ...
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1answer
169 views

Is Java MAM Coming? [closed]

I'm developing a Java REST web services app that works with the Tangle. Currency won't be involved, just data messages, as from sensors. I think MAM is the technology for me, but I am not seeing any ...
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1answer
68 views

What is the exact stitching process that is being done on the tangle and side-tangle and who is doing it?

As a matter of transparency and of user and community education, I think it is important to properly catalog and make public the side-tangle-to-tangle stitching process that has been conducted by ...
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1answer
102 views

When can a transaction be considered irreversable? (without COO)

In an interesting exchange between Come-From-Beyond (CFB) and a Nxt developer, the question is asked: DEV. So when can a transaction be considered irreversable? CFB. Never, look at formula #14 in ...
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234 views

As per “The Stability and the Security of the Tangle”, how will IOTA ensure that all honest nodes are continuously using their hashing power?

As per the recently released The Stability and the Security of the Tangle, a 2018 ICUBE - University of Strasbourg "study of the stability and the security of the distributed data structure at the ...
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134 views

When would it be required to intentionally partition the Iota transaction graph?

According to the original IOTA post on bitcointalk, partition tolerance is not only defined as the ability for the IOTA transaction graph to resist the reversal of large sets of transactions, but also ...
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89 views

What determines the various shapes that show on the Tangle Explorer?

The Tangle explorer is currently displaying an "IC". Is this a secret message? What determines the various shapes that show on the Tangle Explorer? Here is another example, while The Coordinator ...
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1answer
64 views

The “road-map” for when the IOTA Tangle reaches sufficient size? [duplicate]

Apparently we are still in "testnet" including a "coordinator" responsible for the validation of all transactions until the tangle reaches sufficient size. If so, what is the "road-map" on this point?
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61 views

How are nodes incentivised to be honest when approving transactions?

I am new to IOTA and would like to understand how nodes are incentivised to be truthful when approving transactions? Bitcoin: Say a miner approves a tx that is invalid (say bc it double spends). It ...
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1answer
65 views

Interacting with IOTA from mobile application?

Is it possible to interact with IOTA Tangle (for example, send a message) using an application installed in a mobile phone? If so, is it possible to install IOTA library in a mobile phone? And if yes, ...
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92 views

How to compute the % of network computing power the attacker hold?

It is known generally that Tangle is susceptible to 34% attack(of total computing power) that gives a 100% successful attack. The example given on page 19 of white paper says that an upper limit to ...
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Signature Aggregation

Could BLS signatures (https://en.m.wikipedia.org/wiki/Boneh–Lynn–Shacham) be used to aggregate transactions and compress data to keep the Tangle at a manageable size?
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how to relate computing power of attacker to transaction rate of attacker?

Assume that the merchant accepts the legitimate transaction when its cumulative weight becomes at least w_0, which happens t_0 time units after the original legitimate transaction. let μ stand for the ...
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67 views

Transfer from Multisg into normal address

I am following the example described here: https://github.com/iotaledger/iota.lib.java/blob/master/jota/src/test/java/jota/IotaMultisigTest.java I put funds into a multisig. Now I want to move that ...
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1answer
123 views

Problem uploading message to Tangle

I'm working on a project for sending sensor data to the tangle and up to now I've managed to do the following Collect environment data from a sensor attached to a Raspberry Pi Send that data via MQTT ...
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1answer
131 views

Tangle and transaction explorer

I want to have an isolated tangle for testing purposes. I want to explore and browse this tangle for individual transactions, as I attach new transactions on this tangle. Is there an open source ...
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1answer
124 views

“The Tangle” white paper: How the probability of double-spending event end with this approximation (t_0 μ)/w_1?

If the attacker managed to obtain a nonce that gives the double‐ spending transaction a weight of at least 3n0 during the time interval of length t0, then the attack succeeds. The probability of this ...
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383 views

Where can I find the Genesis transaction?

Is there any Tangle explorer where I can find the Genesis transaction and browse from there through the Tangle? In Bitcoin I already found the Genesis Block.
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448 views

Persistence of important data on the Tangle

To this date, the IOTA network truncates all stored transactions after a snapshot, so that we basically only have an image of addresses with funds. Now lets assume following scenario: Company A ...
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123 views

How can IOTA detect local tangle corruption?

When our local tangle changes, how can IOTA detect that? I researched online but can't found a clear answer. Can anyone explain the detailed mechanism for local data corruption detection and recovery? ...
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101 views

Difference between node and site

In the whitepaper is written: A quick note on terminology: sites are transactions represented on the tangle graph. The network is composed of nodes; that is, nodes are entities that issue and ...
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120 views

Why are Oyster Pearl's transactions clumping like this, and not getting confirmed? Is this an issue with the tip selection algo?

It appears that Oyster Pearl, a data transmission service built on the tangle, has launched their testnet and is submitting transactions to IOTA tangle live and tagging them (see above image). As we ...
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4answers
1k views

Is double spending possible in IOTA?

It is mentioned in Tangle's white paper (technology behind IOTA) that From the above discussion it is important to recognize that the inequality λ > μ should be true for the system to be secure. In ...
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2answers
221 views

Understanding getTransactionsToApprove

The official docs for getTransactionsToApprove state The higher your depth value, the more "babysitting" you do for the network (as you have to confirm more transactions). I don’t exactly ...
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339 views

Why does the tangle exhibit clumping?

In the Iota whitepaper the tangle is depicted as a uni-directional graph with a uniformly random set of connections between graph nodes. In the current implementation the true topology of the tangle ...
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1answer
123 views

Snapshot pending transactions address strike through line

Hi I have got bit of issue as I have got balance in my seed now as we all know the snapshot happening on 28 jan 2018 was reading article where is says any pending transactions will be wiped out or ...
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1answer
182 views

Does a wallet actually verify or validate two other transactions?

This is to confirm my understanding: In many talks and posts, it is said that the wallet or client of a node validated or verifies two other transactions. I wonder, whether this is the best ...
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1answer
299 views

Address length requirements

If one sends a 0-value transaction to an address with less than 90 chars [A-Z9], I noticed that thetangle.org appends the address with some random characters so that it consists of exactly 90 chars. ...
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1answer
157 views

What restricts the growth of the “tangle”

In IOTA, each transactions are created by a node performing a fixed POW verification on two other transactions. Since the POW difficulty is never adjusted, node(s) ability to create transactions ...