thumb|Undocumented anonymous portrait of J. K. Mertz Joseph Kaspar Mertz (17 August 1806 – 14 October 1856) was a guitarist and composer from the Austrian Empire. Biography Caspar Joseph Mertz (bapti
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 0x0876f0c4ac276f87f90581ab6b1c89203c7e315dd69e2fdb4a0c615f33a5c116. 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/8859d9f0-7424-4abc-b8fb-c13e88f46b0e.json and https://artists.proofprofile.net/proofs/artist/8859d9f0-7424-4abc-b8fb-c13e88f46b0e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bardenklange, Op. 13: Lied ohne Worte (Song without Words)
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 0xff8277eef905e9723d29a7a770619a3922e0d9eaa397854cd0053f6fe51c60ce. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/HKI190017302.
Bardenklange, Op. 13: An Malvina (To Malvina)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341988023ffee897bbb3668f8fb6865b235790a01848ad6682e41c9f667e299d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/HKI190017309.
Mertz, J.K.: Romantique (Le) / 6 Schubertian Songs / Bardenklange (Excerpts) / Elegie / Fantasie Hongroise
Bardenklänge, Op. 13: Variations mignonnes
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3b2820918ea55a25079981b6add05af33cec520764174d8124df3157cc7af6. 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/QMZ621402848.
Bardenklänge, Op. 13: Romanze - Andante, cantabile
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f74ccb367543bb86685494c8a4646f852fd991921bc24230089852a72e6690. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QMZ621402850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbb1ba6e20f1fd91f14af389edd3a90b8d53fd185aa97245035f6caa9b0e31a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QMZ621402851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf815889e5e788863863bbd23841459ff6902100756cb82c5b048dec512938ebc. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QMZ621402852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ea08762055717142a8c5e1365f3db9221197739e6eb06f7ec9400d1166d1df. 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/QMZ621402853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccc6bd2ca1c12b5b3fae37e8533ab209ddff2d60ec5c3b3253b4c1ca4d748e7. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/QMZ621402854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1aa8d11b2fe1b23d6d73fcc1664341027b64a0136caf3f94a3dd09c7dc9de4f. 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/QMZ621402856.
Bardenklänge, Op. 13: Romanze - Moderato, adagio)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9655ee7a68571a5b5a0220af2dfccf9b7fb80dc8425edddf4743d571aec4451. 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/QMZ621402858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5e682332e17da3dfc4ca397821cd2aa48410e701743cd7ef31e485157aa798. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMZ621402860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb493f979525b4b80888ce3dc77c6194e899a06dd663068bd7eed530c029e708f. 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/QMZ621402862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc9e526165fdb07f6270055210c76349c0b314f106b435ed21af84eb383d0c5. 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/QMZ621402863.
Harpsichord Recital: Brembeck, Christian - Buxtehude, D. / Reincken, J.A. / Bohm, G. / Bach, J.S. (Der Fantastische Styl)
Mertz, J.K.: Bardenklange / Pianto Dell'Amante / Le Romantique / Elegie / Introduction Et Rondo Brillant
Bardenklänge, Op. 13: Unruhe (Restlessness)
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Sechs Schubert'sche Lieder: No. 1, Lob der Thränen
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Sechs Schubert'sche Lieder: No. 2, Liebesbotschaft
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Sechs Schubert'sche Lieder: No. 5, Die Post
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Johann Kaspar Mertz: Bardenklänge, Op. 13, Books 1 - 11
Book No. 1, Op. 13: I. An Malvina (Introduction - Moderato quasi allegretto)
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Johann Kaspar Mertz: Opern-Revue op. 8. Complete Selection after Giuseppe Verdi's Operas
Unruhe - New Transcriptions for Guitar and Piano
Friendly Classical Music That Lets Kids Sleep Well 14
Harp Classical Lullabies That Brings Sleep Gently 23
Schule für die Guitare - Arr. by Richard Wright and Peter Batchelar
Guitar Exam Pieces from 2019, ABRSM Grade 5
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf97dce4404df1c7d2c8ed16a10515261bdc22d93e991790f63638e4104c501. 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/AUAB00650272.
6 Schubertian Songs (arr. J. Mertz for guitar): Lob der Tranen (Praise of Tears), D. 711 (arr. J. K. Mertz)
Guitar Recital: Bianco, Gabriel - Mertz, J.K. / Bach, J.S / Koshkin, N.
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Bardenklange, Op. 13: Book 3: No. 3. Capriccio
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Bardenklange, Op. 13: Book 6: No. 1. Tarantelle
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9ff2bcf653f1764625ca9c397b85cfdd839fac90a394d67b1b97fd260f9d36. 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/HKI190914804.
3 Morceaux, Op. 65: No. 1. Fantaisie hongroise
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