ZcashFoundation · mergify · Apr 25, 2022 · Apr 25, 2022 · Apr 25, 2022 · Apr 25, 2022
@@ -2,7 +2,7 @@
 
 `zebra-checkpoints` uses a local `zcashd` instance to generate a list of checkpoints for Zebra's checkpoint verifier.
 
-Developers should run this tool every few months to add new checkpoints for the `checkpoint_sync = true` mode.
-(By default, Zebra syncs to Canopy activation using checkpoints. These checkpoints don't need to be updated.)
+Developers should run this tool every few months to add new checkpoints to Zebra.
+(By default, Zebra uses these checkpoints to sync to the chain tip.)
 
-For more information on how to run this program visit [Zebra checkpoints document](https://github.com/ZcashFoundation/zebra/tree/main/zebra-consensus/src/checkpoint/README.md)
+For more information on how to run this program visit [Zebra checkpoints README](https://github.com/ZcashFoundation/zebra/tree/main/zebra-consensus/src/checkpoint/README.md)
@@ -1,57 +1,56 @@
 # Zebra checkpoints
 
-Zebra validates pre-Canopy blocks, and the Canopy activation block, using a list of `Mainnet` and `Testnet` block hash checkpoints:
+Zebra validates [settled network upgrades](https://zips.z.cash/protocol/protocol.pdf#blockchain) using a list of `Mainnet` and `Testnet` block hash checkpoints:
 
 - [Mainnet checkpoints](https://github.com/ZcashFoundation/zebra/blob/main/zebra-consensus/src/checkpoint/main-checkpoints.txt)
 - [Testnet checkpoints](https://github.com/ZcashFoundation/zebra/blob/main/zebra-consensus/src/checkpoint/test-checkpoints.txt)
 
-Zebra can also be configured to use these checkpoints after Canopy activation:
-```
+Some of these checkpoints can be disabled using the following config:
+```sh
 [consensus]
-checkpoint_sync = true
+checkpoint_sync = false
 ```
 
+(Zebra always uses checkpoints up to its mandatory checkpoint,
+so that we do not have to implement obsolete consensus rules.)
+
 ## Update checkpoints
 
 Checkpoint lists are distributed with Zebra, maintainers should update them about every few months to get newer hashes. Here we explain how this process is done.
 
+Or jump straight to [the exact commands for updating the lists](https://github.com/ZcashFoundation/zebra/tree/main/zebra-utils/README.md#zebra-checkpoints).
+
 ### Use the `zebra-checkpoints` utility
 
 `zebra-checkpoints` is the program we use to collect checkpoints. Currently this program uses `zcash-cli` to get the hashes. `zcash-cli` must be available in your machine and it must be connected to a synchronized (Mainnet or Testnet) instance of `zcashd` to get the most recent hashes.
 
-To build the `zebra-checkpoints` binary please check [here](https://github.com/ZcashFoundation/zebra/tree/main/zebra-utils/README.md#zebra-checkpoints).
+First, [build the `zebra-checkpoints` binary](https://github.com/ZcashFoundation/zebra/tree/main/zebra-utils/README.md#zebra-checkpoints).
 
-When updating the lists there is no need to start from the genesis block. The program option `-l, --last-checkpoint` will let you specify at what block height you want to start. In general the maintainer will copy the last height from each list and use the mentioned option to start from there.
+When updating the lists there is no need to start from the genesis block. The program option `--last-checkpoint` will let you specify at what block height you want to start. In general the maintainer will copy the last height from each list and use the mentioned option to start from there.
 
-It is easier if `zcash-cli` is in your execution path however you can specify the location of it anywhere in the filesystem with option `-c, --cli`.
+It is easier if `zcash-cli` is in your execution path however you can specify the location of it anywhere in the filesystem with option `--cli`.
 
-Lets pretend `106474` is the last height from the mainnet list, to get the next ones we will run:
+To update the checkpoint list, run:
 
-```
-$ ../target/release/zebra-checkpoints -l 106474
-106517 00000000659a1034bcbf7abafced7db1d413244bd2d02fceb6f6100b93925c9d
-106556 000000000321575aa7d91c0db15413ad47451a9d185ccb43927acabeff715f6d
-106604 00000000293cea40c781a3c8a23d45ae53aa6f18739d310e03bd745f7ec71b14
-106655 0000000034a7018623b2a6a7c81d33f5dcb53c3cfd01ad82676f7f097bdde839
-106703 000000003dd9edb6bc6b331dc87d71cd98b2b3d68e501eb234f26635ee657c42
-106752 0000000014c16181f5d2951285b8f5b2d7a2238ab6305c3e70a0ae125d98f7f3
-106798 00000000349f2c397a0e59d209891ea4c3d6f6221e3b048d62eded9e779de925
-106851 00000000227ba8af70ae7bf66e30521fb3e1b69a3d8169793f614144be1db94c
-106962 00000000320d694499851ddc679a4404f67ff0ee532ba2cc7d00cff1580f8ffc
-107037 000000006ad5ccc970853e8b96fe5351fcf8c9428e7c3bf6376b1edbe115db37
-107088 000000005d71664dc23bcc71482b773de106c46b6ade43eb9618126308a91618
-107149 000000002adb0de730ec66e120f8b77b9f8d05989b7a305a0c7e42b7f1db202a
+```sh
+$ zebra-checkpoints --last-checkpoint $(tail -1 zebra-consensus/src/checkpoint/main-checkpoints.txt | cut -d" " -f1) | tee --append zebra-consensus/src/checkpoint/main-checkpoints.txt
+1574231 000000000030874b90f23cba865355a2058c635a81396a1c6026f1d7ea89e035
+1574631 000000000114d8c70ae8bc0bcc5b94b6b03e9086365b09dd9d3e77b0a2b6554e
+1575031 00000000010074d017d6628ca2cf3327d68be11c993c0e4d3c961ebb81c741dd
+1575431 000000000001060a02bb142d09de383591c2d5a6f589b982bd9ccf2ad8b72e7c
+1575831 000000000094e82cca9af540721e6415097ffd5d70b6adefb8aef6b5898e9b08
+1576231 0000000000710c69b4c8d851883e1ad7c14e74b9c79b0cafc0e6c64cf07a54ab
 ...
 ```
 
 If we are looking to update the testnet hashes we must make sure the cli is connected with a testnet chain. If we have our `zcashd` running locally we can make this by starting with `zcashd -testnet`.
 
 Anything we add after `--` will pass through into the `zcash-cli` program so we can specify the testnet here.
 
-Let's start from the genesis in this case by not specifying any last checkpoint:
+To regenerate the list from the genesis block, run:
 
-```
-$ ../target/release/zebra-checkpoints -- -testnet
+```sh
+$ zebra-checkpoints -- -testnet
 0 05a60a92d99d85997cce3b87616c089f6124d7342af37106edc76126334a2c38
 400 000393fe014f5ff5de7c9f0aa669ee074c9a7743a6bdc1d1686149b4b36090d8
 800 0003bef995cd09a4a2bcb96580fa435ed10c0b44239191fafc825477e84a325d
@@ -60,6 +59,7 @@ $ ../target/release/zebra-checkpoints -- -testnet
 2000 000033804e1bebd8ef6112938dc58d5939874bcb4536e203489eb75520f3c555
 ...
 ```
+
 ### Submit new hashes as pull request
 
 - If you started from a block different than the genesis append the obtained list of hashes at the end of the existing files. If you started from genesis you can replace the entire list files.

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