Block Differences 🔗︎
Finding transaction in a block 🔗︎
Arko brings a concept of Transaction Records as opposed to blocks and this means that each block now only has 1 transaction and the accompanying state changes instead of the sub-block structure of legacy Lamden. Most of Lamden's legacy blocks had only one transaction as it is and so it made getting and ordering those transactions a bit of a pain.
In legacy Lamden you would find yourself iterating the sub-blocks list, then integrating each transactions list for a transaction.
Arko has no more list of a list type concepts and each block will contain 1 and only 1 transaction under there processed property. The processed property contains the exact same transaction data structure that you are used to.
Block Numbers 🔗︎
The block number property is now an HLC representation of nanos which end up bing a big Int and stored as a string. If your Dapp did anything with block numbers this is a very large change. Block numbers are still canonical but no longer consecutive.
legacy Lamden 🔗︎
1, 2, 3, 4, ...
Arko 🔗︎
"1673209855008481024", "1673209868957867008", "1673210350047866112", ...
If your Dapp relies on looking for block numbers sequentially then you will need to rethink the logic. The best way is to work backwards using the previous has property.
It is recommended to use the websocket to get new blocks to avoid overloading any APIs. If you connect to that websocket you will get the lastest_block automatically. You would then work backwards from the previous hash property to see if you have that block already. If not, you would request it, then iterate that logic till you have all blocks.
HLC Timestamps 🔗︎
Nodes now agree on what time the transaction was received and apply an hlc_timestamp to it. That HLC timestamp follows the lifespan of the transaction in the node. When the transaction is minted into the block the HLC is then also added to the properties of the block as hlc_timestamp.
Sample Block 🔗︎
You can observe the differences below
Legacy Lamden 🔗︎
{
"hash": "27c408bc0ed8cd406def99fc47b7447839933f711dd210d47f3d0fe80386958b",
"number": 1206705,
"previous": "20551a66d07918c6d88ceb5a50ada1ecc0ef81fe4bd9e09922b02aa7b423d780",
"subblocks": [
{
"input_hash": "3afe7e235c6557f383828eb09edf223dbd649d9267e4fbda52824e5522da07e2",
"merkle_leaves": [
"e6e14104dc014c73c6eac1c94fd279d3e3506f280902b34ab2f9494ffc894034"
],
"signatures": [
{
"signature": "d58513d8fa868ad1398b66d4fc4b86fd413b827b0704651f54586044d227f7a412d95ed9c1f61a91adc29faaa6953af21b616bfd052e326f96c67e10f8ccec09",
"signer": "2bdb7a98d65a469dacd93873ce3f8b6bb5284414348cab17ade738f913d35e32"
},
{
"signature": "eddde42cec3b6b2da910ca3599bbc2bd3e9c27d95927b8babb8e44bee98076962cc63c3b905bc943da70db0fbdb115332de4eff354b34e99f66dc78082977107",
"signer": "555100f02ef3bdc469e866140c35955e137624f4a1284bbcb999cd7fb576c869"
}
],
"subblock": 0,
"transactions": [
{
"hash": "ab35ba41ff47175db583387b52afcd9849d705a8f42bbb0aae890e047903ca8f",
"result": "None",
"stamps_used": 8,
"state": [
{
"key": "con_dec_fix_7_oracle.current_price:0",
"value": {
"__fixed__": "0.014632485605944951"
}
},
{
"key": "currency.balances:ec60be3db8f551739b52b76bd253f751f167a8e82ee7b393236433c17459b4cd",
"value": {
"__fixed__": "3719.704609400177665863"
}
}
],
"status": 0,
"transaction": {
"metadata": {
"signature": "7cdc1484ce1bfdecd1c318ba4daddd370e1c11f95e32f0b8359fe29f5f3d3884cd72f4b0e6007d82d33efdfceedb272aae014818c2f558507a1a4530fb973c06",
"timestamp": 1673289312
},
"payload": {
"contract": "con_dec_fix_7_oracle",
"function": "set_price",
"kwargs": {
"new_price": {
"__fixed__": "0.014632485605944951"
},
"number": 0
},
"nonce": 370244,
"processor": "5b09493df6c18d17cc883ebce54fcb1f5afbd507533417fe32c006009a9c3c4a",
"sender": "ec60be3db8f551739b52b76bd253f751f167a8e82ee7b393236433c17459b4cd",
"stamps_supplied": 500
}
}
}
]
}
]
}
Arko 🔗︎
{
"hash": "1a00d9c1fea2ba6514688e0ab9ae1437265f3f1fc65374009cd1e5c0c146a12b",
"number": "1673210350047866112",
"hlc_timestamp": "2023-01-08T20:39:10.047866112Z_0",
"previous": "ccae0c7f20406f3617ffe87e33fff75508cf8c6b148e228e24c21f5007054d7a",
"minted": {
"minter": "fad066ac33e8c45d2530dde6393dfc0a860775f8261840c2a0d18b42a8b222c0",
"signature": "f79bbded9ced929a41dae83b1f22a6a31b52f79bbf4cdabe6a27d9646dd2bd725fc29c8bc122cb9e37a2904da00e34df499ee7a897505d1de3f0511f9f9c1150c"
},
"proofs": [
{
"signature": "39f38d7d973e81a461884ecad68fb18fcc81731e728fcdb56a50aee19640956dad309359a2d3168eee260837721b5f02ed898204382b76c364f9aaded0352a0c",
"signer": "9d2dbfcc8cd20c8e41b24db367f215e4ac527dc6a2a0acdb4b6008d13d043ef8"
},
{
"signature": "c87ba4c1a0592357724ad027e125d94729b502f71dd97bda862dac630a7d7f86bc34848204b8a873c62d47bc960a4173669a3eb3f1dbeefe47809066af67e702",
"signer": "fad066ac33e8c45d2530dde6393dfc0a860775f8261840c2a0d18b42a8b222c0"
},
{
"signature": "299519d68eb626820ccf977c661af209efa9e01c3dd77abea27e147e20ea4a81238f871ac5c8534fbfe56110e66651530188a02f5a43795d6383478fdf18f30a",
"signer": "82140a30d6e13812702bfe51f814a781f09ac23f564b3b6d9d7ad26760e1edaa"
},
{
"signature": "fa74c559c9e7e82a171c45f309a27a2b82d92b85f2e794c33cdf3e9da9e944efa1ea97daa43ce9d830398305689227a983646658f9473c4ba4442ca3ee386104",
"signer": "0d5077e53bdb2250ae83f2ea078ed571ba5ddba6c474cc1d24568f7d62d57da7"
}
],
"processed": {
"hash": "d795dbede4c2e3620d673392fc072a917fa8f4558e7d8241e3aa4f6c2b2ae4ff",
"result": "None",
"stamps_used": 20,
"state": [
{
"key": "currency.balances:82140a30d6e13812702bfe51f814a781f09ac23f564b3b6d9d7ad26760e1edaa",
"value": {
"__fixed__": "11724.812746987692307169230769230557"
}
},
{
"key": "currency.balances:ae7d14d6d9b8443f881ba6244727b69b681010e782d4fe482dbfb0b6aca02d5d",
"value": {
"__fixed__": "2010.785134963899841651650774034939"
}
}
],
"status": 0,
"transaction": {
"metadata": {
"signature": "ffd8ded9ced929a41dae83b1f22a6a31b52f79bbf4cdabe6a27d9646dd2bd725fc29c8bc122cb9e37a2904da00e34df499ee7a897505d1de3f0511f9f9c1150c"
},
"payload": {
"contract": "currency",
"function": "transfer",
"kwargs": {
"amount": {
"__fixed__": "123.0"
},
"to": "ae7d14d6d9b8443f881ba6244727b69b681010e782d4fe482dbfb0b6aca02d5d"
},
"nonce": 4,
"processor": "ffd7182fcfd0d84ca68845fb11bafad11abca2f9aca8754a6d9cad7baa39d28b",
"sender": "82140a30d6e13812702bfe51f814a781f09ac23f564b3b6d9d7ad26760e1edaa",
"stamps_supplied": 22
}
}
},
"rewards": [
{
"key": "currency.balances:ffd7182fcfd0d84ca68845fb11bafad11abca2f9aca8754a6d9cad7baa39d28b",
"value": {
"__fixed__": "110079.78564075230769165384615384593"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:9d2dbfcc8cd20c8e41b24db367f215e4ac527dc6a2a0acdb4b6008d13d043ef8",
"value": {
"__fixed__": "110203.55487152153846125384615384593"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:e79133b02cd2a84e2ce5d24b2f44433f61f0db7e10acedfc241e94dff06f710a",
"value": {
"__fixed__": "110213.93948690615384615384615384593"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:0d5077e53bdb2250ae83f2ea078ed571ba5ddba6c474cc1d24568f7d62d57da7",
"value": {
"__fixed__": "10192.569230503846153575384615384398"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:82140a30d6e13812702bfe51f814a781f09ac23f564b3b6d9d7ad26760e1edaa",
"value": {
"__fixed__": "11725.006153580769230246153846153633"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:fad066ac33e8c45d2530dde6393dfc0a860775f8261840c2a0d18b42a8b222c0",
"value": {
"__fixed__": "10192.073845888461538199999999999797"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:3321206f8137f299acf29ebe7df44b61da4b093b630e897d8b081dc0f8668980",
"value": {
"__fixed__": "10190.150768973076922661538461538265"
},
"reward": {
"__fixed__": "0.193406593076923076923076923076"
}
},
{
"key": "currency.balances:0000803efd5df09c75c0c6670742db5074e5a011b829dfd8a0c50726d263a345",
"value": {
"__fixed__": "8711.465153846153846146153846135209"
},
"reward": {
"__fixed__": "0.015384615384615384615384615384"
}
},
{
"key": "currency.balances:sys",
"value": {
"__fixed__": "728.72732178"
},
"reward": {
"__fixed__": "0.15384615"
}
}
],
"origin": {
"signature": "6a6d92eee63324fecdaaf603be8d62346cfc98506ca9eacdcbba244a04ef84c7d0d11653bdbcb86f400f3e1a2e19e9be06945840c004fb6919bd5b26cf8b7c09",
"sender": "ffd7182fcfd0d84ca68845fb11bafad11abca2f9aca8754a6d9cad7baa39d28b"
}
}