Walter van Hauwe (born 16 November 1948) is a Dutch recorder player. Biography and career After lessons at the music school of Delft – where his father was was the director – van Hauwe studied recor
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 0x0d206cb359e7dc5f090f9f42ffd9cf5545494e7c99c6469119f0679249da9d74. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a050d96b-29ed-48fe-93a9-47fcb9c5e42c.json and https://artists.proofprofile.net/proofs/artist/a050d96b-29ed-48fe-93a9-47fcb9c5e42c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concertos, Sonatas & Trio Sonatas for Wind Instruments: Vivaldi, Marcello, Platti, Handel, Telemann, Corelli, Hotteterre
French Baroque Music for Flute by Hottetere, Philidor & Boismortier
Partita No. 5 in E Minor, TWV 41:e1: II. Vivace
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 0x8692be314701adbb482d01be4414f2aa9e40cd055e15927bbc66793c0a18cb2f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA460710915.
Fantasia for Flute without Bass No. 8 in E Minor, TWV 40:9: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5f40c420420d3c1fc96a5285c5deef7040438c9c4b2abb95398eab29fd7577. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLA460710923.
Recorder Sonata in D Minor, TWV 41:d4: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c046294b74a996897268a605daea0fd59467f85ca2258c27fe0b344cc4f0c2c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA460710925.
Partita in A Minor, BWV 1013: II. Corrente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bb8b6b9e3011db1e2b7bd592078b760836402a81dfd69d666a49e108ae0579. 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/NLA460710929.
Partita No. 5 in E Minor, TWV 41:e1: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d84e5bf5963696db1fcebd52057b4eb105cee8fb38e404808e975e0e365595f. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/NLA460710914.
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
Partita No. 5 in E Minor, TWV 41:e1: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70206571656c810ac33900282ed6dac957265b897bfef8a19f81eae366fe751c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLA460710916.
Partita No. 5 in E Minor, TWV 41:e1: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb490c6eeca7d176e5e8a49a8ff25e4af1f1678dae9d6c36d61474aefa45a3b4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA460710917.
Partita No. 5 in E Minor, TWV 41:e1: V. Siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf968a5fbb9044ddb5f8c40e3e65b186ef8cd6339ad57855a2c1073d46e15d7dc. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA460710918.
Partita No. 5 in E Minor, TWV 41:e1: VI. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754ead506172bec6512c5cb1eeab2fb55a5fcfb79839f914b5ed519fdf160aa3. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/NLA460710919.
Partita No. 5 in E Minor, TWV 41:e1: VII. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa16da3eae3ab7f311b0ad3f466fb1b8dcd0e1fc42006bbb4967090d35ad083e. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLA460710920.
Fantasia for Flute without Bass No. 8 in E Minor, TWV 40:9: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775772d929282b70b667de1911b7de07b8607d3f8e96ae8763a47b5f8a341f96. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLA460710921.
Fantasia for Flute without Bass No. 8 in E Minor, TWV 40:9: II. Spirituoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ea1ed7bf9b35c9d7cd5692ef8542b2f72bbe33605e4cd00cca1300f34bc31b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA460710922.
Recorder Sonata in D Minor, TWV 41:d4: I. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ff93d310b7858f8966d0c449452d37d8963cb639ab66d71bb97399f9ac6d3b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLA460710924.
Recorder Sonata in D Minor, TWV 41:d4: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1055f701bcc530ad3bff56b0666660daf94b17eabcf19da7a9386af0a84fb7c3. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA460710927.
Partita in A Minor, BWV 1013: I. Allemande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b35cf60b702a44636082830720cbff9e3ff3a3583d43000def458256759fd6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NLA460710928.
Partita in A Minor, BWV 1013: III. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b1d13dac584506327ede56ebcfa9da1a0060291caef6ba6f3d5086c43ec51f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLA460710930.
Partita in A Minor, BWV 1013: IV. Bourée anglaise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb77b9f94e0f4ad2a9d3cdda5cb4529e830c574fdcaa28f131e741d1c8fe2073. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA460710931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd252eadb35a692972945acddfff40cbd94ab67e9017dfbefaf489e8d2445f0e7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA460610256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe548b21602dc898bbae91fd973431408c61269757dd597f031b4a78e30a90df8. 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/NLA460610257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d1e57d9c4bc8c6c2ad49b58be2c8a8171e63fe95c7ad2ce74150caf1f67379. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA460610261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808d461cf36f7cfaa6f6e5b8c2dc0b43d04054f93646bfdf1ead900828e62490. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLA460610262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1626ba5eb313dfb2407983794d57764b0ba752af33d6fc3b0dacb298f387a0c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA460610264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8829efd1dc83db68c31fe5c560da4a81b3e69f721538588242c04725e7957cc7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA460610258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2102b833db7f5fc49af65bbaf916130bd34e1c06a0f17342f4ca255c4fdcd0af. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLA460610259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d983185bda7d33f528be38adf0053eac39dfa84b12f25f4a69e3567286f0d9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLA460610260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a96341b655222e6f5810a51cc7f92a5d249f1407b04a286ab3015594a4c8a0. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLA460610271.