Maisie Harriet Brand Bourke (born 24 February 2001), known professionally as Maisi, is a British musician and social media personality from south-east London. The daughter of Jo Brand, she co-founded
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2e2bf018292c67075c88ddb5c14f5d4497f34d7aef0972094407c1ff51f9fa. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b411a253-c3bf-4baa-a5fd-38e781b6c551.json and https://artists.proofprofile.net/proofs/artist/b411a253-c3bf-4baa-a5fd-38e781b6c551.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969d16f591e6f264a053cc2c0c252c8cdfe26f31db54396ac71bb04a1668e720. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX53U2080170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d189df0732602bbe1ffba76467b97164dbdfc47498a1d5b398f08f4124628e9. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SGB502267030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f11791f69f5f1abe5d332f58989b03b0c63e259d42b3292bff926f92fad6684. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SGB502222286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afc8041c6e6bbf0bcaaa5bc211ab0800fdf1e42afb04234121bcf87cb3a7827. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:59:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH7819509360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afc8041c6e6bbf0bcaaa5bc211ab0800fdf1e42afb04234121bcf87cb3a7827. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:27:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH7819509360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636a7dcf9143bc470e563378427d7a6f2dcc04422fd52e683c0ac4ea27022d35. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:10:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH7819502133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5dba5be5c571e1bb7f919e11bb4a94f17edf19e2eaa293384ff0ea6a05c8cf4. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT5M22526697.