The Brocas helm is a jousting helm on display at the Rotunda as part of the Tower of London armoury collection. It was commissioned by an English knight from an Italian armourer. It is named after th
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 0xf0d0b01004bf7d62e1aaa37ff02cb7be12321d8e3ab509084e2ecba7f9ef530c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38b7294f-7d29-435f-bd01-62b550b2e9d9.json and https://artists.proofprofile.net/proofs/artist/38b7294f-7d29-435f-bd01-62b550b2e9d9.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 0x3cf3863743a0fa9e72045af1e9ad83b83ebca8bc6e80e673f39086c55a30f3b7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USHM21055041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fa03c255fc974a7ebfad70dc6d7945f76a37567c003b5a16e221653596452c. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:37:25Z), 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/USHM21055044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e26a8d659ab1048e65ea62c4b9f9cf0d4560bcdfccdeab0cbf26532abff9e39. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USCGH1007875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3be37d7b2c9c0fa962d54a4d3d0f4ff031445ea2c9e032adcc5b77295d494f. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USCGH1007876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de4e437eb19dee0ab4ad8cc586df74caddb6cebc5cfa9f63659e2fdc16b4be8. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USCGH1007877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5afc8116ed906efec5ec2ac6e99bfe33c9d7c474cefdea77b84d8f86eeef7fe. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/USCGH1007878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ea01885b8e3eba63670d231fe1628864e84ff879aafee3d46bf8ef1c2c5fed. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USCGH1007880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb353587b54b1fe6ef431f3f878861d90d8bc216d621c7ca8b7100a6cfb69ed18. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USCGH1007883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdc42270f8cdab6fb5409aa91988600d8a729d391454477e4a01be6ed5f80e8. 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/USCGH1007885.