Can I send to Bech32 testnet address?

Developers Getting Started
1

I have the basic-bitcoin tutorial deployed at cfza3-5aaaa-aaaag-qa7lq-cai.
Everything works except the send function. When I try to send my btc back to the test net faucet
dfx canister --network=ic call basic_bitcoin send '(record { destination_address = “tb1qndnfnxvjupgyfut6skz8mdj6zcmgu9r65rv7lr”; amount_in_satoshi = 321; }) ’
I get the following error:
WARN: The default identity is not stored securely. Do not use it to control a lot of cycles/ICP. Create a new identity with dfx identity create and use it in mainnet-facing commands with the --identity flag
Error: Failed update call.
Caused by: Failed update call.
The Replica returned an error: code 4, message: “IC0503: Canister cfza3-5aaaa-aaaag-qa7lq-cai trapped explicitly: assertion failed at Base58.mo:89.11-89.32”

It seems like the code is not able to send to a Bech32 address (tb1…).

2

Have to support address converting before sending txn

3

Thanks, but how is that done?

4

So yeah, that appears to be a bug and not a feature:

I was able to send sats to a testnet faucet address starting with an m. No change of code.

5

https://wiki.internetcomputer.org/wiki/Bitcoin_integration#:~:text=the%20following%20address%20formats%20are%20supported%3A

According to this document, Bech32 is not supported in current implementation

6

According to that document P2WPKH, P2WSH, P2TR are all supported and they are bech32.

The limitation is not in the Bitcoin integration, it is only in the basic_bitcoin example code. See here:

An outer function is taking dst_address and is assuming it is p2pkh when passing it to an inner function. Unfortunately, the inner function only accepts the p2pkh type:

Not sure how necessary that restriction is. There is a whole file for bech32 in that repo:

7

Looking at the bitcoin_canister, it seems supported, let me do a local and mainnet test shortly

8

Thanks for looking into it!

9

I’m using an address derived this way

  // Get BTC address for a given user:
  public func get_btc_address_for_a_given_user(user_principal : Principal) : async Text {
    let derivation_path_with_double_array : [[Nat8]] = await get_btc_derivation_path_for_a_given_user(user_principal);
    let bitcoin_address : Text = await get_p2pkh_address_for_a_given_derivation_path(derivation_path_with_double_array);
    return bitcoin_address;
  };

  // Get BTC derivation path for a given user:
  public func get_btc_derivation_path_for_a_given_user(user_principal : Principal) : async [[Nat8]] {
    let user_principal_blob : Blob = Principal.toBlob(user_principal);
    let user_principal_array : [Nat8] = Blob.toArray(user_principal_blob);
    let derivation_path_with_double_array : [[Nat8]] = [user_principal_array];
    return derivation_path_with_double_array;
  };

  // Adapted from BasicBitcoin example:
  /// Returns the P2PKH address of this canister for a given (as an argument) derivation path.
  public func get_p2pkh_address_for_a_given_derivation_path(derivation_path : [[Nat8]]) : async BitcoinAddress {
    await BitcoinWallet.get_p2pkh_address(NETWORK, KEY_NAME, derivation_path);
  };

And on send I’m seeing

Uncaught (in promise) Error: Call was rejected:
  Request ID: bdd267afdeb9a1abda78fd1627bbdae5ea7654a2ef1e03e7ab43f64f7fa63ab6
  Reject code: 4
  Reject text: IC0503: Canister rrkah-fqaaa-aaaaa-aaaaq-cai trapped explicitly: Error building transaction.

and

[Canister rrkah-fqaaa-aaaaa-aaaaq-cai] Fetching UTXOs...
[Canister rrkah-fqaaa-aaaaa-aaaaq-cai] Building transaction...
[Canister rrkah-fqaaa-aaaaa-aaaaq-cai] pattern failed

How might I fix this?

The problem arises only on send. Address generation throws no errors.