How do we get the fingerprint of an non ADA asset

[PaulMatencio]

How do we get the fingerprint for an asset policy and its asset id (or asset_ascii) ?

"asset_ascii":"PolyPeer2214","policy":"ef76f6f0b3558ea0aaad6af5c9a5f3e5bf20b393314de747662e8ce9"

As for instance from db-sync multi_asset table
select ma.policy,ma.name,ma.fingerprint
from multi_asset ma
where encode(ma.policy,'hex') = 'ef76f6f0b3558ea0aaad6af5c9a5f3e5bf20b393314de747662e8ce9'
and ma.name ='PolyPeer2214';

Policy: 0xEF76F6F0B3558EA0AAAD6AF5C9A5F3E5BF20B393314DE747662E8CE9
name: PolyPeer2214
fingerprint : asset1q924wa9xs5uz3cr4pazgv329pka4d22mhgevd5

[gitmachtl]

This is simple, here is a oneliner in bash:

PolyPeer2214 into hex

$ echo -n "PolyPeer2214" | xxd -ps
506f6c795065657232323134

Concate it with the policyID -> ef76f6f0b3558ea0aaad6af5c9a5f3e5bf20b393314de747662e8ce9506f6c795065657232323134

Calculate the fingerprint

$ echo -n "ef76f6f0b3558ea0aaad6af5c9a5f3e5bf20b393314de747662e8ce9506f6c795065657232323134" | xxd -r -ps | b2sum -l 160 -b | cut -d' ' -f 1 | ./bech32 asset
asset1q924wa9xs5uz3cr4pazgv329pka4d22mhgevd5

what you do is to concate a hexstring of the policyid+assetname. than you convert that into bytes, do a blake2b (160bits->20bytes) hashing on it and than that is bech32 encoded with the prefix "asset"

[PaulMatencio]

Thank you. It is greatly appreciated. When you know, it is so easy.

[PaulMatencio]

Just in case , here is the same thing in golang for people who are interested

import "golang.org/x/crypto/blake2b"
...
assetId, err := hex.DecodeString(asst.Asset.Policy + asst.Asset.Asset)
if err == nil {
hash, _ := blake2b.New(20, nil)
hash.Write(assetId)
fingerPrint, err := bech32.Encode("asset", hash.Sum(nil))
if err == nil {
fmt.Println(asst.Asset.Policy, asst.Asset.AssetASCII, fingerPrint)
}
}

[PaulMatencio]

Thank you . It is greatly appreciated Kind regards Paul Matencio

…

On Thu, Jun 23, 2022, 8:45 PM Martin Lang ***@***.***> wrote: This is simple, here is a oneliner in bash: echo -n "34250edd1e9836f5378702fbf9416b709bc140e04f668cc3552085184154414441636f696e" | xxd -r -ps | b2sum -l 160 -b | cut -d' ' -f 1 | ./bech32 asset what you do is to concate a hexstring of the policyid+assetname. than you convert that into bytes, to a blake2 hashing on it and than that is bech32 encoded with the prefix "asset" — Reply to this email directly, view it on GitHub <#341 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABID6OIOXU3XUKDIOIHEZ63VQSWFRANCNFSM5ZUXKYYQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[scarmuega]

@PaulMatencio @gitmachtl would it help if we added the bech32 encoding for assets as part of the event output?

[gitmachtl]

for me, don't think so. can be easily processed after and takes quite a time to encode everytime i guess. you mean as an additional info right? because bech32 encoded assets cannot be decoded back into policyID+assetName.

[PaulMatencio]

Hi Santiago I believe so. It would be great so I don't have to do it. Here is my transaction document model created during the extraction of the cardano events provided by oura . It should be noted that due to lack of history I could not add missing addresses to uxto_input collateral, mint etc .. At the end of each block, I will keep only one document per transaction, it saves me a lot of space and speeds up further queries ( need just to extract a subpart of a document). The process is pretty past thanks to the concurrency features of the programming language I am using. Kind regards Paul Matencio *Here is my transaction document model * context.tx_hash 8f9a8f3ac874e540fe37a20da2c7472347ca82b731fc65a6fe96648e115b412f { "context": { "block_hash": "8efab7f05865cb50c5bbf46dc8a2567bf550e9326c099384f5717e72777118ab", "block_number": 7412016, "certificate_idx": null, "input_idx": null, "output_address": null, "output_idx": null, "slot": 64415645, "timestamp": 1655981936, "tx_hash": "8f9a8f3ac874e540fe37a20da2c7472347ca82b731fc65a6fe96648e115b412f", "tx_idx": 9 }, "fingerprint": *"64415645.trans.38828000133457693162287893424143555641",* "transaction": { "fee": 569467, "hash": "8f9a8f3ac874e540fe37a20da2c7472347ca82b731fc65a6fe96648e115b412f", "input_count": 2, "inputs": null, "metadata": null, "mint": null, "mint_count": 0, "native_witnesses": null, "network_id": null, "output_count": 2, "outputs": null, "plutus_data": null, "plutus_redeemers": null, "plutus_witnesses": null, "total_output": 6154633, "ttl": 64419159, "validity_interval_start": 64415559, "vkey_witnesses": null }, "utxo_output": [ { "address": "addr1zxj47sy4qxlktqzmkrw8dahe46gtv8seakrshsqz26qnvzypw288a4x0xf8pxgcntelxmyclq83s0ykeehchz2wtspksr3q9nx", "amount": 1724100, "assets": [ { "amount": 1, "asset": "43727970746f44696e6f3036333533", "asset_ascii": "CryptoDino06353", "policy": "7a5a5c3757d33c2b2ff0b09405676e61f93d28b5d12805dd3320e31f", * "finger_print": "asset1ugffhqg9ztf66tpy046xzmkxdz3y0hhjmqfywd"* } ] }, { "address": "addr1qxe4u8t3292kwj9a9mqays0f4he6telz4rf8cxaqnskzqclkl528y00v3m6yvfjjkwzul75f5cz86g6ahdzpn89h55msrhhhw9", "amount": 4430533, "assets": [] } ], "utxo_input": [ { "index": 0, "tx_id": "bcf5fb79e66b566bbf38500edab962409cfe84ca55936b07e2c830b9f9a010df", "address":"" }, { "index": 2, "tx_id": "a51ba880f3b09545264d52be8b8a6f077a583e4992113012e9c7c66a37129f30", * "address":""* } ], "metadata": { "label": "0", "text_scalar": "d8799f581cb35e1d7151556748bd2ec1d241e9adf3a5e7e2a8d27c1ba09c2c20", "map_json": [ { "Key": "msg", "Value": [ "Minswap: Withdraw Order" ] } ] }, "collateral": { "index": 0, "tx_id": "33bcc7dd7ba1ea8fefb7319f2884445db541cce065542611e658739d7f512b82", * "address": ""* }, "plutus_witness": { "script_hash": "7f3ffaaebb69fc434d960ee835e5b2a349a8fb765c1423439dd79fe3", "script_hex": 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}, "native_witness": { "policy_id": "", "script_json": { "scripts": null, "type": "" } }, "plutus_redeemer": { "ex_units_mem": 1679020, "ex_units_steps": 689615199, "input_idx": 1, "plutus_data": { "constructor": 0, "fields": [] }, "purpose": "spend" }, "plutus_datum": { "datum_hash": "e4ecd7ef962a728cd7e8e84447546b2fccb21897872b1b9e86acda0f239d36b6", "plutus_data": [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "bytes", "Value": "b35e1d7151556748bd2ec1d241e9adf3a5e7e2a8d27c1ba09c2c2063" } ], [ { "Key": "list", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "bytes", "Value": "b375bb9fc4efb1035bbcc3f593f4c3ffd43f8925004bf669f682119c" } ] ] } ], [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "bytes", "Value": "9fb9686c713dd04932a540e42047f3b4503dc63dd24020cfdd4dadff" } ] ] } ] ] } ] ] } ] ] } ], [ { "Key": "map", "Value": [ [ { "Key": "k", "Value": [ { "Key": "bytes", "Value": "" } ] }, { "Key": "v", "Value": [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "int", "Value": 0 } ], [ { "Key": "map", "Value": [ [ { "Key": "k", "Value": [ { "Key": "bytes", "Value": "" } ] }, { "Key": "v", "Value": [ { "Key": "int", "Value": 1000000 } ] } ] ] } ] ] } ] } ] ] } ] ] } ], [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "bytes", "Value": "70e60f3b5ea7153e0acc7a803e4401d44b8ed1bae1c7baaad1a62a72" } ] ] } ], [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": 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}, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "bytes", "Value": "f6fd14723dec8ef4462652b385cffa89a6047d235dbb44199cb7a537" } ] ] } ] ] } ] ] } ] ] } ], [ { "Key": "map", "Value": [ [ { "Key": "k", "Value": [ { "Key": "bytes", "Value": "" } ] }, { "Key": "v", "Value": [ { "Key": "constructor", "Value": 0 }, { "Key": "fields", "Value": [ [ { "Key": "int", "Value": 0 } ], [ { "Key": "map", "Value": [ [ { "Key": "k", "Value": [ { "Key": "bytes", "Value": "" } ] }, { "Key": "v", "Value": [ { "Key": "int", "Value": 48000000 } ] } ] ] } ] ] } ] } ] ] } ] ] } ] ] } ] ] } ] } }

…

On Wed, Jul 6, 2022 at 9:29 PM Santiago Carmuega ***@***.***> wrote: @PaulMatencio <https://github.com/PaulMatencio> @gitmachtl <https://github.com/gitmachtl> would it help if we added the bech32 encoding for assets as part of the event output? — Reply to this email directly, view it on GitHub <#341 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABID6ONMDUHH2RZRT4SDZWTVSXNBLANCNFSM5ZUXKYYQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>