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[
  {
    "name": "initialize_nft",
    "accounts": [
      {"name": "nft_state", "isMut": true, "isSigner": false},
      {"name": "user", "isMut": true, "isSigner": true},
      {"name": "system_program", "isMut": false, "isSigner": false}
    ],
    "args": [
      {"name": "initial_image_uri", "type": "string"}
    ]
  },
  {
    "name": "update_nft_metadata",
    "accounts": [
      {"name": "nft_state", "isMut": true, "isSigner": false},
      {"name": "user_token_account", "isMut": true, "isSigner": false},
      {"name": "owner", "isMut": true, "isSigner": true}
    ],
    "args": [
      {"name": "new_image_uri", "type": "string"}
    ]
  }
]