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+# Store Mithril Protocol Configuration Markers On Chain
+
+**This is a work in progress** :hammer_and_wrench:
+
+This is the process for storing Mithril Protocol Configuration markers on the Cardano chain (bootstrap and update operations).
+
+> [!IMPORTANT]
+> :fire: The process described in this document can lead to disturbed service of the associated Mihtril network. Thus it should be manipulated by experts only.
+
+## Pre-requisites
+
+- You need to have a recent version of [`jq`](https://stedolan.github.io/jq/download/) running (1.6+)
+- A running Cardano node running locally on the network you are targeting
+- A running Mithril Aggregator node
+- The protocol configuration activation marker Cardano payment keypairs of your Mithril network
+- The protocol configuration secret key of your Mithril network
+
+## Setup
+
+### Setup environment variables
+
+Export the environment variables needed to complete the process:
+
+```bash
+export CARDANO_CLI=**CARDANO_CLI_COMMAND**
+export CARDANO_NODE_SOCKET_PATH=**PATH_TO_YOUR_NODE_SOCKET**
+export CARDANO_WALLET_PATH=**PATH_TO_YOUR_KEYPAIRS**
+export PROTOCOL_CONFIGURATION_MARKERS_SECRET_KEY=**YOUR_PROTOCOL_CONFIGURATION_MARKERS_SECRET_KEY**
+export ASSETS_PATH=**YOUR_ASSETS_PATH**
+export SCRIPT_TX_VALUE=**MINIUM_SCRIPT_TX_VALUE**
+```
+
+A common value for the transaction amount used when a script transaction is made is:
+
+```bash
+export SCRIPT_TX_VALUE=2100000
+```
+
+Compute the network magic parameter that handles both the Cardano mainnet and Cardano test networks:
+
+- If this is for a testing network
+
+```bash
+export CARDANO_TESTNET_MAGIC=**YOUR_TESTNET_MAGIC**
+export CARDANO_NETWORK_MAGIC="--testnet-magic $CARDANO_TESTNET_MAGIC"
+```
+
+- If this is for the `mainnet`
+
+```bash
+export CARDANO_NETWORK_MAGIC="--mainnet"
+```
+
+Compute the current Cardano era:
+
+```bash
+export CARDANO_ERA=$($CARDANO_CLI query tip $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH | jq  -r '.era |= ascii_downcase | .era')
+```
+
+### Prepare protocol configuration markers
+
+> [!IMPORTANT]
+> :fire: A misconfiguration of the protocol configuration markers can cause disturbed service on a Mithril network.
+
+#### Exporting last active protocol configurations markers from the chain in a JSON file
+
+Export latest active configurations from the Cardano chain:
+
+```bash
+./mithril-aggregator protocol-configuration export-markers --target-path $ASSETS_PATH/protocol-configurations.json
+```
+
+JSON prettified export will look like bellow :
+
+```json
+[
+  {
+    "epoch": 42,
+    "protocol_parameters": {
+        "k": 1,
+        "m": 2,
+        "phi_f": 0.3
+    },
+    "cardano_transaction_signing_config": {
+        "security_parameter": 10,
+        "step": 11
+    },
+    "cardano_blocks_transactions_signing_config": {
+        "security_parameter": 20,
+        "step": 22
+    },
+    "enabled_signed_entity_types": [
+        "MithrilStakeDistribution",
+        "CardanoStakeDistribution",
+        "CardanoDatabase",
+        "CardanoTransactions",
+        "CardanoBlocksTransactions"
+    ]
+  }
+]
+```
+
+#### Modifying protocol configurations
+
+Manually edit previously exported JSON file written at `$ASSETS_PATH/protocol-configurations.json`
+
+> [!IMPORTANT]
+> :fire: Make sur to keep, if it exists, at least the three last epoch's configuration without any modification.
+
+#### Generate Tx Datum payload file
+
+Generate Tx Datum payload file by using previously edited JSON file
+
+```bash
+./mithril-aggregator protocol-configuration import-markers --protocol-configuration-markers-secret-key $PROTOCOL_CONFIGURATION_MARKERS_SECRET_KEY --import-path $ASSETS_PATH/protocol-configurations.json --target-path $ASSETS_PATH/protocol-configurations-datum.json
+```
+> [!IMPORTANT]
+> You may encounter errors if JSON is not valid, contains zero values or contains inconsistent configurations regarding the chain configurations of the targeted environement.
+
+#### Verify the produced protocol configuration marker
+
+Verify that the produced protocol configuration markers are exactly what is expected with the following command:
+
+```bash
+cat $ASSETS_PATH/protocol-configurations-datum.json| jq -r '.fields[].bytes' | tr '\n' ' ' | xxd -r -p | jq
+```
+
+An example output of the command is:
+
+```json
+{
+  "markers": [
+    {
+      "epoch": 42,
+      "configuration": "a37370726f746f636f6c5f706172616d6574657273a3616b09616d184d657068695f66f93800781b656e61626c65645f7369676e65645f656e746974795f74797065738378184d69746872696c5374616b65446973747269627574696f6e6f43617264616e6f44617461626173657343617264616e6f5472616e73616374696f6e73781a7369676e65645f656e746974795f74797065735f636f6e666967a27463617264616e6f5f7472616e73616374696f6e73a27273656375726974795f706172616d65746572186464737465700a781b63617264616e6f5f626c6f636b735f7472616e73616374696f6e73f6"
+    },
+    {
+      "epoch": 43,
+      "configuration": "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"
+    }
+  ],
+  "signature": "16d6e2fcdce9ad24c27a80b0a93ae912a9561660dc100ef628274d5ea0de76d8328282cf29f119da4d9cfae16c015b3138af27561eb5d75ac2c9fbf5629d3d0e"
+}
+
+```
+
+
+## Bootstrap Protocol Configuration Markers: Write a transaction with the first version of datum on chain
+
+> [!IMPORTANT]
+> :fire: This step must be done only once for an address when no prior datum has been written in a UTxO.
+> Otherwise, you need to refer to this [section](#update-protocol-configuration-markers-write-a-new-version-of-datum-on-chain)
+
+Verify that the payment address has funds:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH
+```
+
+```bash
+                           TxHash                                 TxIx        Amount
+--------------------------------------------------------------------------------------
+f0c0345f151f9365fbbb4e7afa217e56b987d9e91fd754ca609d9dfec97275c7     0        10000000000 lovelace + TxOutDatumNone
+```
+
+And create the variable `TX_IN={TxHash}#{TxIn}` by replacing with values from the previous command:
+
+```bash
+TX_IN=f0c0345f151f9365fbbb4e7afa217e56b987d9e91fd754ca609d9dfec97275c7#0
+```
+
+Now create the bootstrap transaction with datum:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction build $CARDANO_NETWORK_MAGIC \
+    --tx-in $TX_IN \
+    --tx-out $(cat $CARDANO_WALLET_PATH/payment.addr)+$SCRIPT_TX_VALUE \
+    --tx-out-inline-datum-file $ASSETS_PATH/protocol-configurations-datum.json \
+    --change-address $(cat $CARDANO_WALLET_PATH/payment.addr) \
+    --out-file $ASSETS_PATH/tx.raw \
+    --socket-path $CARDANO_NODE_SOCKET_PATH
+```
+
+```bash
+Estimated transaction fee: Lovelace 168669
+```
+
+Then sign the transaction:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction sign \
+    --tx-body-file $ASSETS_PATH/tx.raw \
+    --signing-key-file $CARDANO_WALLET_PATH/payment.skey \
+    $CARDANO_NETWORK_MAGIC \
+    --out-file $ASSETS_PATH/tx.signed
+```
+
+And submit it:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction submit \
+    $CARDANO_NETWORK_MAGIC \
+    --tx-file $ASSETS_PATH/tx.signed \
+    --socket-path $CARDANO_NODE_SOCKET_PATH
+```
+
+```bash
+Transaction successfully submitted.
+```
+
+Also get the transaction id:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction txid --tx-file $ASSETS_PATH/tx.signed
+```
+
+```bash
+6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb
+```
+
+We need to wait a few seconds before the transaction is available and we can see the initial datum for the script address:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH
+```
+
+```bash
+                           TxHash                                 TxIx        Amount
+--------------------------------------------------------------------------------------
+6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb     0        1500000 lovelace + TxOutDatumInline ReferenceTxInsScriptsInlineDatumsInBabbageEra (ScriptDataConstructor 0 [ScriptDataBytes "[{\"n\":\"thales\",\"e\":1}]",ScriptDataBytes "\165\143\232\227\&6\244e\222\211\187\167\197\167\175\229\181\162o/\182[|Nnt.h\ACKE\241=\242\139\242\182:a\204r\217\200&\190I\SO,\US\DLE\152\217U\223P5\128\164\232\153\181\ETB8\132\227\SO"])
+6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb     1        9998327415 lovelace + TxOutDatumNone
+```
+
+Optional: We can retrieve the initial value stored in the datum with the cardano cli:
+
+The full utxo json representation:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH --out-file temp.json && cat temp.json | jq '.[] | select(.inlineDatum | . != null and . != "")'
+```
+
+```bash
+{
+  "address": "addr_test1qzzngukkj9ydjemqjlgfn42sevy2xnvauay46weushlpuq9thd4ray00csjssf4sxftv04xeequ3xfx72nujg9y4d5ysgkxxlh",
+  "datum": null,
+  "inlineDatum": {
+    "constructor": 0,
+    "fields": [
+      {
+        "bytes": "5b7b226e223a227468616c6573222c2265223a317d5d"
+      },
+      {
+        "bytes": "a58fe8e336f465ded3bba7c5a7afe5b5a26f2fb65b7c4e6e742e680645f13df28bf2b63a61cc72d9c826be490e2c1f1098d955df503580a4e899b5173884e30e"
+      }
+    ]
+  },
+  "inlineDatumhash": "d8c1865816a520b92aa19ac5bc295fb1996281adf5ff06366343c6432d591cd1",
+  "referenceScript": null,
+  "value": {
+    "lovelace": 1500000
+  }
+}
+```
+
+The parsed protocol configuration markers json representation:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH --out-file temp.json && cat temp.json | jq -r '.[] | select(.inlineDatum | . != null and . != "")| .inlineDatum.fields[].bytes' | tr '\n' ' ' | xxd -r -p | jq
+```
+
+```json
+{
+  "markers": [
+    {
+      "epoch": 42,
+      "configuration": "a37370726f746f636f6c5f706172616d6574657273a3616b09616d184d657068695f66f93800781b656e61626c65645f7369676e65645f656e746974795f74797065738378184d69746872696c5374616b65446973747269627574696f6e6f43617264616e6f44617461626173657343617264616e6f5472616e73616374696f6e73781a7369676e65645f656e746974795f74797065735f636f6e666967a27463617264616e6f5f7472616e73616374696f6e73a27273656375726974795f706172616d65746572186464737465700a781b63617264616e6f5f626c6f636b735f7472616e73616374696f6e73f6"
+    },
+    {
+      "epoch": 43,
+      "configuration": "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"
+    }
+  ],
+  "signature": "16d6e2fcdce9ad24c27a80b0a93ae912a9561660dc100ef628274d5ea0de76d8328282cf29f119da4d9cfae16c015b3138af27561eb5d75ac2c9fbf5629d3d0e"
+}
+```
+
+## Update Protocol Configuration Markers: Write a new version of datum on chain
+
+> [!IMPORTANT]
+> :fire: This step must be used anytime the protocol configuration markers must be updated on chain for an address when prior datum has already been written in a UTxO.
+> Otherwise, you need to refer to this [section](#bootstrap-protocol-configuration-markers-write-a-transaction-with-the-first-version-of-datum-on-chain)
+
+Retrieve the utxo of the payment address:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH
+```
+
+```bash
+                           TxHash                                 TxIx        Amount
+--------------------------------------------------------------------------------------
+6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb     0        1500000 lovelace + TxOutDatumInline ReferenceTxInsScriptsInlineDatumsInBabbageEra (ScriptDataConstructor 0 [ScriptDataBytes "[{\"n\":\"thales\",\"e\":1}]",ScriptDataBytes "\165\143\232\227\&6\244e\222\211\187\167\197\167\175\229\181\162o/\182[|Nnt.h\ACKE\241=\242\139\242\182:a\204r\217\200&\190I\SO,\US\DLE\152\217U\223P5\128\164\232\153\181\ETB8\132\227\SO"])
+6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb     1        9998327415 lovelace + TxOutDatumNone
+```
+
+And create the variable `TX_IN_DATUM={TxHash}#{TxIn}` by replacing with values from the previous command (where inline datumn are available):
+
+```bash
+TX_IN_DATUM=6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb#0
+```
+
+And create the variable `TX_IN_NO_DATUM={TxHash}#{TxIn}` by replacing with values from the previous command (where inline datumn are not available):
+
+```bash
+TX_IN_NO_DATUM=6518b3cea0b49b55746ec61148e7c60ab042959d534f6bb6e8f6a844d4af69fb#1
+```
+
+Now create the update transaction with datum:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction build $CARDANO_NETWORK_MAGIC \
+    --tx-in $TX_IN_DATUM \
+    --tx-in $TX_IN_NO_DATUM \
+    --tx-out $(cat $CARDANO_WALLET_PATH/payment.addr)+$SCRIPT_TX_VALUE \
+    --tx-out-inline-datum-file $ASSETS_PATH/protocol-configurations-datum.json \
+    --change-address $(cat $CARDANO_WALLET_PATH/payment.addr) \
+    --out-file $ASSETS_PATH/tx.raw \
+    --socket-path $CARDANO_NODE_SOCKET_PATH
+Estimated transaction fee: Lovelace 179889
+```
+
+Then sign the transaction:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction sign \
+    --tx-body-file $ASSETS_PATH/tx.raw \
+    --signing-key-file $CARDANO_WALLET_PATH/payment.skey \
+    $CARDANO_NETWORK_MAGIC \
+    --out-file $ASSETS_PATH/tx.signed
+```
+
+And submit it:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction submit \
+    $CARDANO_NETWORK_MAGIC \
+    --tx-file $ASSETS_PATH/tx.signed \
+    --socket-path $CARDANO_NODE_SOCKET_PATH
+Transaction successfully submitted.
+```
+
+Also get the transaction id:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA transaction txid --tx-file $ASSETS_PATH/tx.signed
+```
+
+```bash
+1fd4d3e131afe3c8b212772a3f3083d2fbc6b2a7b20e54e4ff08e001598818d8
+```
+
+We need to wait a few seconds before the transaction is available and we can see the updated datum for the script address:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH
+```
+
+```bash
+                           TxHash                                 TxIx        Amount
+--------------------------------------------------------------------------------------
+1f139b47017c9c90d4622ac768e249d25d37ad4461db44a20486b7da72a78915     0        2000000 lovelace + TxOutDatumInline ReferenceTxInsScriptsInlineDatumsInBabbageEra (ScriptDataConstructor 0 [ScriptDataBytes "[{\"n\":\"thales\",\"e\":1},{\"n\":\"pythagoras\",\"e\":null}]",ScriptDataBytes "^P\EOT\248k3\196/\139\tU\173H\138\FS\194MD\240\153\227\142z\181\134\213\168\&2\222\219i1\246\NAK\\]\247\154U\143-^vmtq\204\207#\236\213\f\201\&1\152\145(\161\ETX;\183\128\195\r"])
+1f139b47017c9c90d4622ac768e249d25d37ad4461db44a20486b7da72a78915     1        9997647526 lovelace + TxOutDatumNone
+```
+
+We can retrieve the updated value stored in the datum with the cardano cli:
+
+The full utxo json representation:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH --out-file temp.json && cat temp.json | jq '.[] | select(.inlineDatum | . != null and . != "")'
+```
+
+```bash
+{
+  "address": "addr_test1qzzngukkj9ydjemqjlgfn42sevy2xnvauay46weushlpuq9thd4ray00csjssf4sxftv04xeequ3xfx72nujg9y4d5ysgkxxlh",
+  "datum": null,
+  "inlineDatum": {
+    "constructor": 0,
+    "fields": [
+      {
+        "bytes": "5b7b226e223a227468616c6573222c2265223a317d2c7b226e223a227079746861676f726173222c2265223a6e756c6c7d5d"
+      },
+      {
+        "bytes": "5e5004f86b33c42f8b0955ad488a1cc24d44f099e38e7ab586d5a832dedb6931f6155c5df79a558f2d5e766d7471cccf23ecd50cc931989128a1033bb780c30d"
+      }
+    ]
+  },
+  "inlineDatumhash": "021310e8764d7d7ec3d66c00792ff391fa2145e1c8328eaf4630734c43bcfedc",
+  "referenceScript": null,
+  "value": {
+    "lovelace": 2000000
+  }
+}
+```
+
+The parsed protocol configuration markers json representation:
+
+```bash
+$CARDANO_CLI $CARDANO_ERA query utxo --address $(cat $CARDANO_WALLET_PATH/payment.addr) $CARDANO_NETWORK_MAGIC --socket-path $CARDANO_NODE_SOCKET_PATH --out-file temp.json && cat temp.json | jq -r '.[] | select(.inlineDatum | . != null and . != "")| .inlineDatum.fields[].bytes' | tr '\n' ' ' | xxd -r -p | jq
+```
+
+```json
+{
+  "markers": [
+    {
+      "epoch": 42,
+      "configuration": "a37370726f746f636f6c5f706172616d6574657273a3616b09616d184d657068695f66f93800781b656e61626c65645f7369676e65645f656e746974795f74797065738378184d69746872696c5374616b65446973747269627574696f6e6f43617264616e6f44617461626173657343617264616e6f5472616e73616374696f6e73781a7369676e65645f656e746974795f74797065735f636f6e666967a27463617264616e6f5f7472616e73616374696f6e73a27273656375726974795f706172616d65746572186464737465700a781b63617264616e6f5f626c6f636b735f7472616e73616374696f6e73f6"
+    },
+    {
+      "epoch": 43,
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+  ],
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+}
+```