9
votes
Accepted
What happens to a MAM (Masked Authenticated Message) Stream during a Snapshot?
In a MAM stream, every message holds a reference to the next one. To follow the stream when there is a snapshot you must always keep the ref to the next message.
Currently, to read the beginning of ...
- 5,344
7
votes
Accepted
What's the point of using the Merkle Tree in MAM instead of just single private key?
To piggyback off of Chris, you can have forward secrecy even with a merkle tree of one leaf (which is the same as a simple one-time signature).
However, there are a few things (some of which I ...
- 316
4
votes
How does MAM handle key exchange to initiate secure data messaging?
MAM doesn't dictate you how to distribute the key. You can use encrypted peer-to-peer connection, post service, carrier pigeons or the tangle itself. It's up to you.
- 498
3
votes
Accepted
Using Public Nodes in IOTA Tangle for testing purpose
You can change the URL in the provider field to a node that's on the Mainnet.
You can use this URL as an example: https://nodes.thetangle.org/
Or, you can run your own node.
Be sure to use a ...
- 361
3
votes
Accepted
Is it secure to enter your seed in a browser form to publish data to IOTA Tangle?
It's irrelevant, you don't need a seed to publish a MAM message since you don't sign the transaction:
Example: https://github.com/iota-community/javascript-iota-workshop/blob/master/code/7.1-mam-...
- 1,099
3
votes
Maximum how many possible characters to transfer in a message?
When you want to send data via MAM, you have to encode the data in a specific way. The encoded data will be inserted in the signature/message slot of your transaction (0-value txs don't need any ...
- 496
3
votes
Accepted
How to send Health Data to Tangle via MAM?
I just tested your code and it worked for me. This is an example of the response:
NVYRBTEAJAYAJMWIAHRMZNT9PQMIUWFTLQOB9RVAIWDLDOSZHPJCWEGNF9JTZLCTULRFCWFEAFAPUIMFM
Published
Object {numberofSteps: 14,...
- 361
3
votes
Accepted
Can MAM use non-zero value transactions?
There is no value transfer within MAM.
It's a messaging api
https://github.com/iotaledger/MAM
- 528
3
votes
MAM: Can stored data in restricted mode be revoked at any time?
When storing data on the Tangle using MAM, you actually issue 0 value transactions that encapsulate your data. As such, it is impossible to revoke the data once published. By throwing away the side ...
3
votes
(WebJS) MAM Channels using Channel ID's
I used code downloaded from here.
Basically:
in public mode the publisher chooses a seed and keeps it secret.
Then he starts to publish messages on a channel represented by the first Merkle tree ...
- 710
3
votes
Will MAM not lead to network congestion?
Transaction size is limited. An intensive data stream will be splitted into many transactions. Each transaction requires a small pow and the idea is that even if it is small, the pow will discourage ...
- 5,344
2
votes
MAM: What is the purpose of the nonce in the masked_payload?
The purpose of the nonce is explained in:
https://www.mobilefish.com/download/iota/masked_payload_part20.pdf
- 363
2
votes
How to send a sidekey securely to the subscriber for my channel
You can use a Key-Sharing technique like a Group Diffie-Hellman key agreement or you can mask (encrypt) the sideKey and channel-id using the Public keys of the receivers. As i know, there's a public-...
2
votes
Is Java MAM Coming?
Since iota.lib.java is a community effort (not written by the foundation), I assume a MAM library would have to be written by the community as well. – mihi♦
2
votes
Accepted
How to stream XDK 110 data via MAM
I just ran across this implementation
https://antonionardella.it/mqtt-data-on-the-tangle-with-mam/
- 194
2
votes
Append message to MAM channel
I do not hold a direct answer, I am sorry.
What I would like to add is that MAM is going to be deprecated with the upcoming Chrysalis Part 2 upgrade, therefore I suggest you look into IOTA Streams, ...
- 589
2
votes
Can MAM use non-zero value transactions?
MAM does not support value transfer
All transactions (also the ones that send 1i) are deleted by a snapshot (on non-permanodes), only the final balances remain.
Therefore if you need transactions to ...
mihi♦
- 7,254
1
vote
Accepted
Conflicting data types iota.c and streams
Your intent is correct, both libraries should be compatible, or at least coexist peacefully. You are also not mistaken in assuming that neither of the libraries can do everything: iota.c is a Node ...
- 126
1
vote
Accepted
How to send a data payload of a size 1 MB or greater with MAM and node.js?
Splitting the data into fragments will work. Alternatively if you work with the IOTA streams library you should have more luck with big sizes.
https://github.com/iotaledger/streams
- 56
1
vote
Edit MAM stream already implemented on Tangle
Yes, you can add new messages to a MAM stream by reloading the “mam state” and then simply publishing again. here is an example using javascript
https://github.com/Evanfeenstra/helix/blob/master/...
- 71
1
vote
How is a MAM stream implemented on the Tangle?
Yes exactly, each leaf is a new transaction.
However, since Mam transactions do not have any “value”, they do not actually need any validation. They are immediately available to fetch after they are ...
- 71
1
vote
Accepted
Why is the async function not working while fetching MAM data?
Mam.fetch is not an async function, instead use the callback. You can make any “callback style” function into an async function by wrapping the call in a return new Promise((resolve,reject)=> .... ...
- 71
1
vote
Accepted
How do I know MAM data has been published?
You just run Mam.fetch. You need to store the root somewhere, and the sideKey if you are using “restricted” mode.
- 71
1
vote
How do I know MAM data has been published?
What library do you use? You can check, if the transaction is referenced by a milestone. This is the ultimate confirmation for your transaction. If the milestone directly or indirectly confirms your ...
- 840
1
vote
How to send a sidekey securely to the subscriber for my channel
Key exchange is a problem not just for IOTA MAM but a lot of cryptographic algorithms especially for symmetric-key encryption.
How can I securely transmit the keys?
To get the key from one actor to ...
- 4,459
1
vote
Problem uploading message to Tangle
Never used Pandas, you probably have to ask elsewhere to get an answer how to serialize your object
There are two methods of generating addresses. There is one way to generate the next free address (...
mihi♦
- 7,254
1
vote
MAM: What is the purpose of the nonce in the masked_payload?
On the IOTA blog they state:
an additional nonce may be used as a revocable encryption key
If I understand it correctly (and I believe I saw this in a MAM POC somewhere), it can be used to ...
- 11
1
vote
What's the incentive to use recommended tip selection algorithm for MAM transactions?
To be honest, I am not sure whether you can be that careless about whether your transactions confirm.
There is no guarantee that unconfirmed transactions will (eventually) reach every node of the ...
mihi♦
- 7,254
1
vote
Accepted
MAM Issue:TypeError: Transaction.quietFromHash is not a function
As reported the use of mam.client.js is deprecated.
Try with the source from http://iotameetup.nl and watch this @ 1:21:00 as already suggested by this answer.
- 710
1
vote
Error running Iota MAM example
To try MAM I recommend using the instructions as per latest IOTA meetup in Amsterdam. You can download the source from http://iotameetup.nl/ and watch https://www.youtube.com/watch?v=_ZO2ysgzKkM @ 1:...
- 21
Only top scored, non community-wiki answers of a minimum length are eligible