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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Why nodes are still unconfirmed with two tips?

As per the understanding, to issue a new transaction, we need to validate 2 unconfirmed transactions called tips, and then we can append a new transaction to those transactions, adding 2 new edges to ...
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WASP Chain Setup TCP Connection Refused Error

I am trying to setup a WASP Chain to test deploy a EVM smart contract. However, I try to wasp-cli request-funds or wasp-cli chain deploy I am getting a dial tcp connect:connection refused error. This ...
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Questions / confusing sentences in IOTA White Paper

Question 1: this is the paragraph It is important to observe that we do not impose any rules for choosing which transactions a node will approve. Instead, we argue that if a large number of nodes ...
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30 views

Where are the storage elements stored? Are all stored in rocksdb or some are stored as file?

We know that Bitcoin and Ethereum are storing their raw blocks as files in the system, and recording the recent states (utxo set in Bitcoin and world state in Ethereum) in leveldb. Is the storing ...
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How to send a data payload of a size 1 MB or greater with MAM and node.js?

I know MAM is deprecated but I am doing some research on MAM. I was able to send and fetch a data payload of size 740 KB. But when I tried to use a data of 1 MB I am getting this issue with node.js ...
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Is IOTA byzantine fault tolerant?

Is there mathematical proof that IOTA is byzantine fault-tolerant?
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Where do I get the send and receive addresses of a private IOTA Tangle setup?

I am running a private Tangle Hornet node and am able to create transactions and retrieve data about them too. But, where do I get the send and to address of that transaction?
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How to send a transaction in private tangle Hornet of IOTA?

I have deployed an IOTA tangle network on Hornet and it is running successfully on http://localhost:8081/. How do I send a transaction to it? Are there any steps or could you please share any ...
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1 vote
1 answer
37 views

Should a stable coin be implemented as colored coin or in a contract?

The advantage of a stable coin being a colored coins is that it is live on the tangle and does not sit within a contract. Whereas the shortcoming is that you cannot add more if it. The amount is fixed....
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2 votes
1 answer
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Is/was it difficult to implement colored coins?

To me it looks like colored coins just have additional information stored. It sounds like a struct that has an additional variable. There's probably more to it, I did not yet check that in the source ...
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2 votes
2 answers
132 views

What's the advantage of colored coins compared to ERC20 tokens?

It's incredible how easy it is to create colored coins on the current devnet. That's amazing! And those coins are treated just like normal iotas. Has any other chain accomplished to publish colored ...
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2 votes
1 answer
84 views

Unknown value in milestone payload

I'm exploring the following milestone message. And I'm using the following RFC: 0019-RFC From the message, I've identified almost every element, but there is one that is not referenced in the ...
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3 votes
1 answer
109 views

Values in message structure do not match RFC message structure

I'm trying to understand what is the structure of the messages in IOTA. I used scylla to download some messages and now I don't see that the structure from the message matchs with the current one ...
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3 votes
1 answer
43 views

How can I analyse some tangles generated in the mainnet to compare with synthetic ones generated using a simulator?

I’m a researcher I’m trying to analyse some tangles generated in the mainnet to compare with synthetic ones I generated using a simulator I have hard time understanding how to get a database. I’ve got ...
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2 votes
0 answers
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How to get the bundle hash or tail transaction hash by using the prepare_transfer() and send_trytes methods?

I am sending data to my hornet private tangle in Python. I wanted to do separate api calls to prepare the transaction and publish the transaction. So, I used api.prepare_transfer() and api.send_trytes(...
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1 answer
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What is the state tracking approach in IOTA IRI?

It is important to keep track of the state, e.g., in order to perform verification of transactions. While it is possible to reconstruct the most updated state by starting from the initial state and ...
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What is the address of a restricted channel in Masked Authenticated Messaging (MAM)?

I have read many research papers, articles and the iota documentation. However, I am still confused whether the address for restricted mode is hash(merkle root) or hash(side_key + merkle root) Please ...
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How to publish messages using MAM to my private tangle?

I have a private tangle with 2 hornet nodes. I tried MAM using one of the devnet nodes by following the example on the official IOTA webpage. Can someone please tell me how do I publish and fetch ...
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Merkle tree cannot be calculated in hornet

I am trying to calculate merkle tree using the below command:sudo -u hornet COO_SEED="$YOURSEED" hornet -d $HORNETPATH tool merkle. I am getting an error like:sudo: unknown user hornet and ...
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1 answer
79 views

Tangle : Algorithm to determine if a transaction is valid or not

A node needs to verify that all transaction that it receives are valid before adding it to its local copy of tangle. For this we would need an algorithm which given the cone of this transaction would ...
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Accessing JSON message from IRI node API using Python 3

I am using one command tangle. The tangle is running on Ubuntu machine. From the list of APIs given for IRI node, I'm trying to broadcast a transaction. For this, the first step is to get ...
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Connection to private node (one command tangle) refused

I have created a one command tangle from this link: https://docs.iota.org/docs/utils/0.1/community/one-command-tangle/overview And using API given here: https://docs.iota.org/docs/node-software/0.1/...
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3 votes
1 answer
85 views

Using Public Nodes in IOTA Tangle for testing purpose

I want to send some string data using MAM over IOTA Tangle. Right now, I am using devnet. I want to know how can we test our transactions using public nodes on Mainnet? What is the process for it? I ...
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0 votes
1 answer
41 views

I can't work out how to get TangleID to work

So im trying to get tangleID to work to use it on a project. I am using this project. https://github.com/TangleID/TangleID But everytime I try and run the code i get an error message of "Mam.init is ...
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2 votes
1 answer
84 views

How long do Zero Value Transactions last?

Let s say we have some critical information stored as Zero Value transactions on the Tangle. How long does it last? Which robust approaches do you recommend to keep a copy of those transactions? I ...
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Is it secure to enter your seed in a browser form to publish data to IOTA Tangle?

I am trying to publish my data on IOTA Tangle using MAM. For this, I have designed a web form where I have to enter my seed and press the publish button. The actual data is fetched from firebase ...
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-1 votes
1 answer
37 views

is tangle (IoTA) Depth-first search or Breadth-first search?

There is several of algorithms for topology sorting for DAG. What is algorithm used by tangle for search, is it Depth-first search or Breadth-first search or is there another method?
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1 answer
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Edit MAM stream already implemented on Tangle

For my project, I have created a web interface on which I'm viewing a published MAM stream. I want to know that is it possible to edit or add new record to MAM stream that has already been published ...
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0 votes
1 answer
49 views

Error in neighbors list on IoTA full node iri-playbook

I have install iri-playbook but when I want to show my neighbors list using this command nbctl -l it shows this error: ERROR: Error response from node: code 500, response: '{"exception":"port out of ...
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1 vote
1 answer
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How is Tangle Quantum Immune? [duplicate]

I was going through the iota tangle documentation and features and found one of the feature mentioned as Quantum Immune , so basically looking for resources to understand the quantum immune property ...
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2 votes
2 answers
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How is a MAM stream implemented on the Tangle?

What I am wondering is how the Merkle tree for a MAM stream is implemented in the Tangle. Is each set of new data in the stream basically a "leaf", and considered a separate transaction on the Tangle ...
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2 answers
34 views

How do transactions reference each other in the Tangle?

How do transactions reference other transactions in the Tangle, is it through the Merkle root, or signature message fragment? And how can you make a transaction reference another chosen transaction. ...
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1 vote
1 answer
58 views

Why is the async function not working while fetching MAM data?

I am making a simple MAM publish and fetch script. The first script is mam_publish which publishes the data. The other script is mam_receive which fetched the already published data. Now, the ...
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0 votes
2 answers
63 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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3 votes
1 answer
140 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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1 vote
0 answers
33 views

what is the Mathematical principle of the tangle

how do i get the probability of the douple-spending?
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1 vote
2 answers
126 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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0 votes
1 answer
49 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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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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3 votes
1 answer
226 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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1 vote
2 answers
133 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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2 votes
1 answer
63 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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1 vote
1 answer
108 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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2 votes
2 answers
94 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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4 votes
1 answer
81 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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1 vote
0 answers
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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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2 votes
1 answer
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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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3 votes
1 answer
134 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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5 votes
1 answer
201 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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