David Hirschfelder (born 18 November 1960) is an Australian musician, film score composer and performer. As a musician he has been a member of Little River Band and John Farnham Band. He has composed
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 0xb6a0f14d506c16c16f03440675f81da25a6da08211ef7d6ba3c5717c97aea19a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/faa6cd78-a5e3-4fcf-b774-01a099f92093.json and https://artists.proofprofile.net/proofs/artist/faa6cd78-a5e3-4fcf-b774-01a099f92093.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fabulous Four (Original Motion Picture Soundtrack)
Sleeping Dogs (Original Motion Picture Soundtrack)
Ascendant (Original Motion Picture Soundtrack)
Escape from Pretoria (Original Motion Picture Soundtrack)
Ride Like a Girl (Original Motion Picture Soundtrack)
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 0x986d40788c552cf0a879da4d84feae90ec8a2b2eab962e6f81aeb46c5694604a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USL4Q1904266.
Aquamarine (Original Score from the Motion Picture)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c58f3072e179daa68f96fd4b3c54a2d394cf9c9519c91a2e18a05fc5a6e2404. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USFM91800450.
In Like Flynn (Original Motion Picture Soundtrack)
The Children of Huang Shi (Original Motion Picture Soundtrack)
The Dressmaker (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76e97e8569f1513c610e5def64f31d9cddf5aad0dec0818a224abe1a78cf383. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USHM81514940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54cc70cf1d75bb01dd38719287d895530dbcb97e79bdd613f401ef938b77545. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USHM81514944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ae653987a3cfbcabf0b6872ca0ff98c1f7937205fcdeb324c709b84ded68a7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USHM81514953.
Healing (Original Motion Picture Soundtrack)
John Doe: Vigilante (Original Motion Picture Soundtrack)
Sanctum (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99442901fcca07dfa173b297714bbfefeb377a21881b92e03de25ad51e05956. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USQ4E1000050.
Legend of the Guardians: The Owls of Ga'Hoole (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e28ec52f85bc08c46acb2b4eff0d1ee5bb9cba3ab20eaf3ef299445b6d65615. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USNLR1000372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbf2a3a2ea50008f108f6a2d54b0c4a646d0638f27a28fd072a5275d4ccdc02. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USNLR1000373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb752ffca77e811374efcf03de9b5e0ca3fc1294a0f4249ebf4debe9502608d5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNLR1000379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb608a626069996fa4bc12e0162d4f5364b2ea8d049f5f06a400c98a1af10839a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNLR1000385.
Elizabeth - Original Motion Picture Soundtrack: Love Theme - Arrest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd7f8c1fbee736494e13365ec964406712b154ca1f344e094af3c9f41849ac8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF079812350.
Elizabeth - Original Motion Picture Soundtrack: Coronation Banquet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581fe694e5a2acdc1e59a71a6de98ef2e6106153399e93114c8411b1d510cf96. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079812390.
Elizabeth - Original Motion Picture Soundtrack: Love Theme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59124cff686b965d8aebf778338000de8cdefdf84e761afb6d1b13f3459e1ebc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF079812400.
Variations on an Original Theme, Op. 36 "Enigma": 9. Nimrod (Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4cbe1de8b612f95d1f15738b6bbc1052cb05157527555e6b4057d57efd9233. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF079812470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28040ef3eceb57e8bef659082bf2c4469b84de74d90d410b78492089874779b0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USFM90900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb264d68b0677828f37bc73800508014ae8500d8a256d8d3bd9c353b222c4a5fe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USFM90900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4022658453e31cfbebd0e2500e8a48a53d324655df8334685d830336d9019b97. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USFM90900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90efc687dfedcf8d62ec67bc993275dd1fe28ee73d7351133cbb5daf3ba866c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USFM90900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc1b53a8896a6ad859d3739e9c0dcbb1b6dab2c04b2917f5bfa3481fbfca362. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USFM90900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf61e3a38ba3af36065726ba9bcf7c33624717f1005e10adfa9b95639e2acacf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USFM90900036.
Shine - Original Motion Picture Soundtrack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7550c70cc3a3266a535fc63efa1249b2125fdbc81c741f731f6887b41904a1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLA509615219.
Hungarian Rhapsody No. 2 in C sharp minor, S.244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea886bbe7a18d2feb218e5ac344fae16a377a0cba3c83a3af7ef681a56f260d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLA509615224.
Nulla in Mundo Pax Sincera - Arr. Edwards/Hirschfelder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b0dded92eb42d55f4c7ebbdd7bd50f433e552e1c5e250fcc1dff4a7954f4fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA509615234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944719cc65fedc2384b213e1803d8a2a55eda87385da8f09a3de2f908a70e1eb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLA161851103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e15f8616984d124540ce277eba3ff31cbcf304d916f8dbc3e9f91f024cee00. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLA161851104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c69ddf2c02a611ebe86bac50c449c9f2d4d0243c2690bb2a9d7d203b5f94c1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLA161851117.
On the Nature of Daylight (From "Arrival")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be5a27ac5c00ab11c92d967e9814381b59fc40fbd4a8d3135711ca2c425c705. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLA161851119.
A Street Cat Named Bob (Original Motion Picture Soundtrack)
Bob der Streuner (Original Motion Picture Soundtrack)