Nostr.build uses a blurhash or something in the event that appears in Amethyst as the image is loading. Maybe something like that?

nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug nostr:nprofile1qqsfnz2sqsflkatdssmeztxr90s8xrd7r07xkhfwaa6eu9zkcguljpgppemhxue69uhkummn9ekx7mp0qyt8wumn8ghj7un9d3shjtnddaehgu3wwp6kytcpzamhxue69uhkummnw3ezuendwsh8w6t69e3xj7srn6f7x nostr:nprofile1qqsglv2qkn5dmmuhee9cy8fywfu2rfp4xd3xy0myqg2gfvmjl9yqqrqpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43qz8rhwden5te0dehhxarj9ekh2arfdeuhwctvd3jhgtnrdaksz9nhwden5te0wfjkccte9ec8y6tdv9kzumn9wsrny48f