John Hartmann (October 24, 1830 – 1897) was a Prussian brass composer.The Brass Band Portal mailing list: Mark in Woodstock Re: John Hartmann, 17 Feb 1996 He is notable for having served Prince George
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8b375e80694e0dadfebd2f9ae2d86a523da61d984085447cda17dccefbca21. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a44589e9-4fd7-402f-a6ab-1ee10d2b4f6b.json and https://artists.proofprofile.net/proofs/artist/a44589e9-4fd7-402f-a6ab-1ee10d2b4f6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Variations on 'Rule Britannia' - John Hartmann
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60e558de239a50cebd021129513e732e5d640224fdc857d058449f4fbb83a94. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM20760661.
Fantasia brilliante on the air Rule Britannia (Arr. For trumpet and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491bcdea4af7444a9abaf2db4af1871fef1c3353f47e2ec70bbb6648e146ed7d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/SEAEC8587150.
Antonsen, Ole Edvard: Golden Age of the Cornet (The)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289ff21e1b5bc13e6a6d5911e688e85d3b5d0ac8427cf82e001aae57f2990347. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SEAEP0698060.
歌劇「タンホイザー」より「入場の行進曲（祝祭行進曲）」 (J. ハルトマン編)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cad7a786925772239c352d4ef8a96e6879004b60599d0b65d6183dd9bc50b1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/JPH291670104.
Facilita (Arr. for Wind Ensemble by Peter Graham)
Virtuoso: Music for Euphonium & Brass Band
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ec8d4ed319df2862d70eb4e16f8cbd81f01758e3548d1f5774d9b13c69121a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKI192439409.