Questions tagged [michelson]
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103
questions
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1answer
6 views
How can I debug "Error in generated Michelson contract" SmartPy CLI compilation error
I'm trying to compile a script locally, it doesn't throw any errors in the online SmartPy terminal, but when I try to compile locally with add_compilation_target and SmartPy CLI I get:
"Error in ...
0
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1answer
17 views
Has human-readable feedback from contract simulation been considered?
I am wondering if feedback to wallet-users from Michelson contracts has been considered previously in the development of Tezos, and where is it / why is it not being considered ?
I am thinking it ...
0
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2answers
25 views
Do FA2 entrypoints need to be at the top level in order to comply with the spec?
Most of the example FA2 implementations I've found, as well as the deployed contracts I've investigated have the required FA2 entrypoints (transfer, balance_of, update_operators) buried in the second ...
1
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1answer
129 views
Is it possible to break out / access storage from a michelson lambda?
I am new to Michelson and Smartpy so forgive if I have any mistakes, I will try to correct them.
I have not been able to find an answer to the question if a function like the below, prevents the ...
1
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2answers
54 views
In Michelson, is it possible to get the balance of an arbitrary contract?
In Michelson, is it possible to get the balance of a contract other than the current one?
According to the Michelson reference, it's possible for a contract to get its own balance.
But, is it possible ...
0
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1answer
31 views
Packing args in taquito to match sp.pack / PACK
How can i pack on taquito side params so that they match what i would get in smartpy with sp.pack?
Say i have params two ints and a string: 1, 3, "something"
What do i need to do in taquito ...
1
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1answer
37 views
how does the liquidity baking CPMM round up or down?
I'm not sure how to ask this and I may mess up my mathematical terms, if you think I have then please correct me.
When I call addLiquidity on the CPMM, I know that I will be sending tez, and that ...
1
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1answer
32 views
how to calculate current storage values for liquidity baking CPMM
In looking at the storage values of the CPMM one can see that as of right now the CPMM has the following amounts of tzBTC (represented by the contract as tokenPool), xtz (represented as xtzPool), and ...
0
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1answer
97 views
how to send a nat value other than a whole number
How can I send a nat value to a contract that represents a data type which is not a whole number?
For example, the xtzToToken entrypoint of the tzBTC contract allows a user to call the xtzToToken ...
1
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1answer
48 views
value is invalid for type
I'm trying to call the addLiquidity entrypoint of this contract, which is a copy of the Liquidity Baking CPMM contract, which is itself a copy of the Dexter contract.
The original Dexter docs give an ...
2
votes
1answer
89 views
Can't get tzBTC out of the tzBTC Granadanet contract
i'm trying to (eventually) add liquidity to the Liquidity Baking CPMM contract on Granadanet. In order to add liquidity, I need some tzBTC from the tzBTC contract here.. I cannot, for the life of me, ...
1
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1answer
18 views
Is the data held within a ticket publicly visible in any way?
I'm talking about the tickets feature introduced in Edo.
Is it safe to hold private data in a ticket basically - I'm talking about this in the context of a game where there is certain information that ...
0
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1answer
18 views
Why does SOURCE instruction push not a key_hash value but an address one?
In my understanding, only implicit accounts can initiate a transaction. Then, if I am correct, the destination of SOURCE must be an implicit account, and the question arises.
I know various ways to ...
2
votes
1answer
37 views
Smartpy Michelson errors only on deployment (inconsistent_annotations, inconsistent_types)
Getting this error ONLY when deploying the smartpy contract. There are otherwise no errors when testing/compiling the code. Is there a way to get a better error message? Is there a way to trigger ...
0
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1answer
24 views
What is the current block level pushed by the Michelson instruction `LEVEL`?
What is the meaning of "current" in the description of the michelson instruction LEVEL:
LEVEL: Push the current block level
0
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3answers
67 views
Is there an equivalent of the Ethereum "selfdestruct" opcode in Tezos?
In Ethereum you can implement a selfdestruct opcode in a smart contract to remove its code from the blockchain and free up storage space.
Is there an equivalent on Tezos ?
1
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3answers
89 views
Is there a way to view the stack during development with Michelson?
Is there some kind of debugger tool to view the stack while developing with Michelson (other than try-michelson.com)?
Thanks.
0
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2answers
29 views
Timestamp in mock-up mode
Is there a way to control what NOW returns in the mock-up mode?
If not, this could be done via a special command in the client to increase it. This seems important for testing.
0
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1answer
20 views
decidability of real world contracts
I'm wondering if there has been any work done on the decidability of real world, legal contracts.
Michelson is great because it lends itself to users bring able to write smart contracts that are ...
1
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1answer
25 views
Trouble Initializing Contract with Lists
I am trying to learn smart contracts on Tezos and decided to originate my own. The contract is expecting the following storage:
pair (pair (address %owner)
(list %received
...
1
vote
2answers
96 views
Why is this big map update using up so many bytes?
In this question I asked why so much Tezos was burned when updating 380 cells in a grid.
It's surprising to see how many bytes it actually took though. If you look at the transaction, there were 380 ...
1
vote
1answer
21 views
Questionable typecheck script result of some michelson code
I've tried to type check create_contract.tz in mini_scenarios and had the following result. It is well-typed, but I'm wondering if the occurrence of the last comment /* [ pair (list operation) (...
0
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0answers
78 views
FA 1.2 Token contract interaction
I want to call an Approve method on a FA1.2 token contract.
Michelson code of Approve method at FA1.2 token contract:
(pair %approve (address %spender) (nat %value))
My PascaLigo code:
type ...
0
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1answer
59 views
Get entrypoint operation (get_entrypoint_opt) fails
I have some troubles to call a contract.
This is the scenario:
Contract B (Entrypoint method "transfer"):
(pair %transfer (bytes %args1)
(pair (string %args2)
...
1
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2answers
191 views
Best Language to Use with Tezos
There are a lot of options when it comes to coding Smart Contracts on Tezos. My question is simple, which of the supported languages is the best in terms of support, east of use, documentation, and ...
2
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1answer
22 views
2
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1answer
68 views
How do you read and store a UTF-8 value in Michelson
The Michelson document from the Tezos Developers Resources page states the following about the string type:
Strings, with some usual escape sequences: \n, \, ". Unescaped
line-breaks (both \n ...
2
votes
1answer
55 views
Support for emojis in LIGO?
Is LIGO going to get native support for emojis?
When I tried compiling a contract with the classic 🚀 (rocketship emoji) inside a string, I got the error Unexpected character '\240'.
Honestly, without ...
0
votes
1answer
22 views
Does LIGO support parameterized types?
Does LIGO support parameterized types?
Consider rcons, which is like cons (::) but with the arguments flipped.
I'd like to be able to write something like:
let rcons((xs, x): T list * T): T list =
x ...
1
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0answers
26 views
Can a Edo Sapling Smart Contract, Emit a FA2 token? with the message from the payload_enc?
Can Edo Sapling Smart Contract, implement some kind of logic to emit a FA2 NFT ticket with metadata coming from the sapling message ?
1
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2answers
81 views
Michelson gas cost optimizations: any techniques, patterns and rules of thumb
Gas cost is an important topic in smart contract development. We want to maintain the costs as low as possible to allow for more operations in a block. There is a handy gas consumption reference, but ...
3
votes
1answer
48 views
Max stack depth of a Michelson program?
Is it possible to determine an upper bound for the (runtime) max stack depth that a given Michelson program will use?
I'm thinking here in terms of static analysis of the program. So, 'given a ...
1
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1answer
70 views
Design an oracle that provides random values to a contract
This answer mentions an improved way for an oracle to provide random numbers to a contract.
use commitments, i.e. the oracle would push a hash in the contract before the game, and send the random ...
1
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1answer
48 views
How are tickets passed to and read by contracts in the Edo protocol?
The Michelson documentation for the Edo protocol mentions four new operations for tickets and this blog post has an example of how tickets are used. I see that the contract in that example can take a ...
1
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1answer
45 views
How un/reliable is the timestamp provided by NOW in Michelson?
To which extend can bakers manipulate the timestamp Michelson uses for NOW?
I am not really sure how this value is provided to the smart contract and how reliable/unreliable it can be...
Is it safe to ...
2
votes
2answers
110 views
Passing parameters in truffle tests
I have this parameter for a function:
type modify_list is
| Add of list(address)
| Remove of list(address)
type modify_list_michelson is michelson_or_right_comb(modify_list)
When I try to supply ...
1
vote
1answer
55 views
What's the best way to convert from TMutez to TBytes?
Previously when I asked about converting types, I got this useful suggestion:
For mutez, you could start to convert to int (by dividing by 1 mutez) and then use the same techniques.
I'm wondering if ...
1
vote
2answers
77 views
How to Integrating SmartPy compiler within the browser?
I have been trying to integrate the SmartPy compiler toolchain within Cryptoverse wars Learning interface and have been going through this video (OCaml Under The Hood: SmartPy) and have encountered ...
1
vote
2answers
105 views
How can I write On Chain Contract Calls in Tezos Sandbox?
I am trying to write a test case in Tezos Sandbox that uses an On Chain Contract Call. To start with, I am trying to implement the example from SmartPy "On Chain Contract Calls - Collatz" ...
0
votes
1answer
50 views
How are pairs serialized in Tezos?
Running the PACK operation on a tuple (represented as a pair in Michelson, I get
$ ligo interpret -s pascaligo 'Bytes.pack((1, 2))'
0x05070700010002
The numbers 1 and 2 are serialized as 0001 and ...
0
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1answer
70 views
Handling floating point numbers in decentralized exchanges
I am writing a contract in Ligo that manages FA2 fungible tokens with an interface that lets users easily create new tokens. I am building a very simple exchange where the users can create orders to ...
2
votes
1answer
72 views
How to call PACK in JavaScript
In my smart contract in LIGO I serialize some data using Bytes.pack which calls the underlying PACK Michelson instruction. In my case, the function signature is (nat, address, nat) -> bytes. Does ...
2
votes
1answer
122 views
Batching Transactions FA2
On the Tzip for FA2, I read that
Every transfer operation MUST happen atomically and in order. If at least one
transfer in the batch cannot be completed, the whole transaction MUST fail, all
token ...
1
vote
1answer
56 views
Maximum value for Nat in michelson
Hello what is the maximum value for natrual number in michelson or what a bigmap can handle. I am trying to write a FA1.2 contract and is concerned if there will be a maximum amount an account can ...
2
votes
1answer
36 views
What are the changes in Michelson in Dalphanet?
Dalphanet introduces quite a few new primitives and types.
What are these primitives and types?
What are their typing rules?
1
vote
1answer
22 views
How does sp.record arrange data into pairs?
For example if I have the following code:
sp.record(one = one, two = two, three = three, four = four, five = five)
Would the format of the result be
pair(one pair(two pair(three pair(four five))))
or
...
3
votes
1answer
163 views
Gas costs types in Michelson
Gas cost is an important topic in tezos and I would like to understand better
the different types of it that occur in michelson
how they are calculated
Could someone offer me a pointer ?
2
votes
1answer
43 views
Overflow/ Underflow in Smart Contract
Is Tezos vulnerable to overflow/ underflow attacks on the smart contracts? If yes, how do you recommend to test whether a particular smart contract suffers from it.
1
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1answer
45 views
Michelson: Parameter vs Storage
I'm struggling to process what the difference between parameter and storage is in Michelson. From what I've been reading, it just looks like two different types of inputs to a contract. So how should ...
2
votes
1answer
27 views
Timestamps overflow/underflow errors
In the list of possible errors in RPC: http://tezos.gitlab.io/api/errors.html#michelson-parsing-macros, there are timestamp_add and timestamp_sub errors, that could happen in arithmetic instructions ...
