A message accepted on one chain may be accepted elsewhere without proper binding.
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A permission form should identify the jurisdiction where it is valid.
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From a public address to a verified signatureStep 1 / 4
An address is public receiving information. It is not the private key that authorizes actions.
An address is public receiving information. It is not the private key that authorizes actions.The local signing system uses secret authorization material. It produces a signature; the private key is not sent along with it.A verifier checks the signed request under the account’s rules. A valid signature does not by itself prove that the action is safe.Balances belong to network state. A wallet is an interface and signing system, not a box containing coins.
Animated local teaching model. No wallet, RPC or live blockchain data. Some labels and hashes are abbreviated for readability.
Identify the shared authorization
If two deployments accept the same digest and signer, one signature may be usable on both. Similar contract addresses do not remove that possibility.
Bind the intended domain
Include and enforce the relevant chain and verifying-contract context under a suitable signing scheme. A field merely shown by a website is insufficient.
Add local consumption rules
Even correctly separated chains need nonce or usage rules within each intended domain. Cross-chain separation and same-chain replay prevention solve different problems.
Test changed domains
Generate a fixture for the intended chain, then change chainId or verifying contract. The altered context should not satisfy the original authorization policy.
Work through the boundary
same signer + same unbound digest on chain A and B
→ possible cross-chain acceptance
review enforced domain and nonce scopes
A simplified local review scenario. The example establishes a question to test, not a guarantee of production safety.
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Does same-chain nonce consumption alone establish cross-chain binding?
The other chain may have its own unconsumed nonce state.