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Approvals

Transfer 10 Tokens from an Allowance of only 5​

casper-client put-deploy -n http://3.143.158.19:7777 \
--chain-name integration-test \
--secret-key ~/casper/ibm_demo/user_b/secret_key.pem \
--session-hash hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180 \
--session-entry-point "transfer_from" \
--session-arg "owner:key='account-hash-303c0f8208220fe9a4de40e1ada1d35fdd6c678877908f01fddb2a56502d67fd'" \
--session-arg "recipient:key='account-hash-f32a2abc55316dc85a446a1c548674e03757974aaaf86e8b7d29947ae148eeca'" \
--session-arg "amount:u256='10'" \
--payment-amount "10000000000"

Since we know that the allowance value is less than 10, we expect the deploy to fail.

Note:

Here is an example of a deploy failure due to overspending an allowance

Additional transfer_from of Remainder 5 tokens​

casper-client put-deploy -n http://3.143.158.19:7777 \
--chain-name integration-test \
--secret-key ~/casper/ibm_demo/user_b/secret_key.pem \
--session-hash hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180 \
--session-entry-point "transfer_from" \
--session-arg "owner:key='account-hash-303c0f8208220fe9a4de40e1ada1d35fdd6c678877908f01fddb2a56502d67fd'" \
--session-arg "recipient:key='account-hash-f32a2abc55316dc85a446a1c548674e03757974aaaf86e8b7d29947ae148eeca'" \
--session-arg "amount:u256='5'" \
--payment-amount "10000000000"

Invoking balance_of for user D

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_balance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "address:key='account-hash-f32a2abc55316dc85a446a1c548674e03757974aaaf86e8b7d29947ae148eeca'" \
--chain-name integration-test \
--payment-amount 1000000000

casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash d068439dc1f62e330a15e008e5e926e777fd3599baed4ece508d482c50bd263b

Invoking allowance for B’s tokens of A

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_allowance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "owner:key='account-hash-303c0f8208220fe9a4de40e1ada1d35fdd6c678877908f01fddb2a56502d67fd'" \
--session-arg "spender:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'"
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash e863633b47b0689033744855739009b45a8654dadd4ed723f527fd38157a1d92

Approving C to spend 10 of B’s ERC-20 tokens​

casper-client put-deploy -n http://3.143.158.19:7777 \
--chain-name integration-test \
--secret-key ~/casper/ibm_demo/user_b/secret_key.pem \
--session-hash hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180 \
--session-entry-point "approve" \
--session-arg "spender:key='account-hash-89422a0f291a83496e644cf02d2e3f9d6cbc5f7c877b6ba9f4ddfab8a84c2670'" \
--session-arg "amount:u256='10'" \
--payment-amount "10000000000"

Invoking allowance to check C’s allowance

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_allowance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "owner:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'" \
--session-arg "spender:key='account-hash-89422a0f291a83496e644cf02d2e3f9d6cbc5f7c877b6ba9f4ddfab8a84c2670'" \
--chain-name integration-test \
--payment-amount 10000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash e9f069c2c03b18f86c15fec54286ac66ece368ac36d9d28024d0cd6cfc93fcf5

Transfer_from C’s Allowance to D​

casper-client put-deploy -n http://3.143.158.19:7777 \
--chain-name integration-test \
--secret-key ~/casper/ibm_demo/user_c/secret_key.pem \
--session-hash hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180 \
--session-entry-point "transfer_from" \
--session-arg "owner:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'" \
--session-arg "recipient:key='account-hash-f32a2abc55316dc85a446a1c548674e03757974aaaf86e8b7d29947ae148eeca'" \
--session-arg "amount:u256='5'" \
--payment-amount "10000000000"

Invoking balance_of for user A

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_balance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "address:key='account-hash-303c0f8208220fe9a4de40e1ada1d35fdd6c678877908f01fddb2a56502d67fd'" \
--chain-name integration-test \
--payment-amount 1000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash eb506808fe0749364163fea646c3f4ef35bb55363ea849da219badcd6ba3ee80

Invoking balance_of for user B

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_balance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "address:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'" \
--chain-name integration-test \
--payment-amount 1000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash 0ce2c4991543758337a38d1d8f7fe56a42616b95ec93b17aec35a6f03b5e389c

Invoking balance_of for user C

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_balance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "address:key='account-hash-89422a0f291a83496e644cf02d2e3f9d6cbc5f7c877b6ba9f4ddfab8a84c2670'" \
--chain-name integration-test \
--payment-amount 1000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash 215c50c0e86950cb91bd8e1045315c1129bbaa02d4e49e00bed60130c4dfa69c

Invoking balance_of for user D

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_balance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "address:key='account-hash-f32a2abc55316dc85a446a1c548674e03757974aaaf86e8b7d29947ae148eeca'" \
--chain-name integration-test \
--payment-amount 1000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash 4e8b0de303f834cb7c61bef148046e3de4446903bd15a395c9c37a6d96efe8c6

Invoking allowance to check C’s allowance

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_allowance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "owner:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'" \
--session-arg "spender:key='account-hash-89422a0f291a83496e644cf02d2e3f9d6cbc5f7c877b6ba9f4ddfab8a84c2670'" \
--chain-name integration-test \
--payment-amount 10000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash d6d4d3e59017dfc21e2c9a8e235e2a2b3a446284a066a1f1f6704559fbb35a66

Failure to Overspend C's Allowance**​

casper-client put-deploy -n http://3.143.158.19:7777 \
--chain-name integration-test
--secret-key ~/casper/ibm_demo/user_c/secret_key.pem \
--session-hash hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180 \
--session-entry-point "transfer_from" \
--session-arg "owner:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'" \
--session-arg "recipient:key='account-hash-f32a2abc55316dc85a446a1c548674e03757974aaaf86e8b7d29947ae148eeca'" \
--session-arg "amount:u256='10'" \
--payment-amount "10000000000"

Note:

Here is an example of a failure to overspend C's allowance

Invoking allowance to check C’s allowance

casper-client put-deploy -n http://3.143.158.19:7777 \
--secret-key ~/casper/ibm_demo/user_a/secret_key.pem \
--session-package-name "erc20_test_call" \
--session-entry-point "check_allowance_of" \
--session-arg "token_contract:account_hash='account-hash-b568f50a64acc8bbe43462ffe243849a88111060b228dacb8f08d42e26985180'" \
--session-arg "owner:key='account-hash-9f81014b9c7406c531ebf0477132283f4eb59143d7903a2fae54358b26cea44b'" \
--session-arg "spender:key='account-hash-89422a0f291a83496e644cf02d2e3f9d6cbc5f7c877b6ba9f4ddfab8a84c2670'" \
--chain-name integration-test \
--payment-amount 10000000000
casper-client query-global-state -n http://3.143.158.19:7777 \
--key uref-56efe683287668bab985d472b877b018ad24a960aafadb48ebc5217737b45c85-007 \
--state-root-hash be29754920f158f093c1daac780fba37bed06c751f256a43fcdc7b5b2775e487