Proofable Docs | Portable Trust Infrastructure

Verifier ID: nft-ownership

Use cases

Lookup. Proofable checks on-chain ownership.

Field	Required	Notes
`contractAddress`	Yes	NFT contract or mint
`tokenId`	Yes	Token ID
`chainId` or `chain`	Yes	Chain id or CAIP-2 chain
`tokenType`	No	`erc721` (default) or `erc1155`
`ownerAddress`	No	Wallet to check; defaults to the signer
`blockNumber`	No	Check ownership at a specific block

{
  "contractAddress": "0x...",
  "tokenId": "1",
  "chainId": 8453
}

High-stakes access: pair with freshness checks or require a new proof when policy demands it. Full schema: nft-ownership.json.

Last modified on September 8, 2026