Katarzyna Mycka (born 1972) is a Polish marimba player and percussionist. Biography Mycka studied at the Stanislaw Moniuszko Music Academy in Gdansk with residencies in Stuttgart and Salzburg. Sh
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 0x8238795868c3c8b49209d2b7dcfbfb45c7c57815c0e72badb36a76edbd95a72f. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cac9c8c6-17b9-4514-95d9-5e50648cb2e5.json and https://artists.proofprofile.net/proofs/artist/cac9c8c6-17b9-4514-95d9-5e50648cb2e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Marimba Synergy - Bach Goldberg Variations
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 0x06ffca34fa5fb4f54a4f02a813accae755fa85181120b7625ed5455536350507. 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/DEE282062601.
Goldberg Variations, BWV 988: Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b08f57b50c5275e67e215d0ba96da0494ee54e759e2fe7d641eebede21c297. 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/DEE282062602.
Goldberg Variations, BWV 988: Variation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09bc20e661d3230b60c05fcd72dba909331fd7b580fef86e8831af3e3295b9f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEE282062605.
Goldberg Variations, BWV 988: Variation 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec18bc1bfc71ff4778c2072ec613f9413a46a22b82d3da5481b6a9ee2587bcb. 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/DEE282062606.
Goldberg Variations, BWV 988: Variation 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62bd6ce57cc3a9e33c2d8996f63068f97614f393d9f7cc1e4f28e9926d93e79. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEE282062610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519f55b9625a7469f37f432aa7006ad27cf31e38883863b241abed0e0a891583. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEVI41804001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed984d05b913f9d27488dffdea7a4805c1dc5abd08499db24e35cb4b60d40dd7. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEVI41804002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079db5e5722a176edcfe41ff39d787741e9e4c39c9e3ecab131a48ec6b115c66. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEVI41804003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ae5ebe466a4abebdea402464e392b4cf8c0e2d417cc074973c6719efe7058c. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEVI41804004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955a665cf72b906a8b07fe9f14227cdf172689cbdbccc2fd5ebf61abf83a02a8. 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/DEVI41804005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e0915d2c4d2d5faf716f6624adfd60e9194101bd00d3b4855ce109f22e7657. 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/DEVI41804006.
Sammut, Ignatowicz-Glinska, Séjourné & Rosauro: Marimba Present
Concerto for Marimba and Strings: I. Tempo souple
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fe6c081f2afe474e9f21b09d367a9da74dd296086cf5ea33b74904e7f0ced1. 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/DEE281659206.
Concerto for Marimba and Strings: II. Rythmique, energique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84170018bfdd5224c94c0d6852f217eb26d082f7f1ebd04e743861b3cbab2de. 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/DEE281659207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3d6c8aeef22475dfceea7df81ab9d474d51dd62ef9267ab76c3348138a3529. 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/DEE280845901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4932ec21818e8dbe51c81806c822caebe68afec39c8c9da18b190bd7a3f15ed6. 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/DEE280845903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a53c3565b4a891532c3393e735731b27adc34f7481142cc9b34f3323017114. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEE280845908.
Keiko Abe, Matthias Schmitt, Ney Rosauro, Rüdiger Pawassar, Anna Ignatowicz, Leander Kaiser & Steve Reich: Marimba Sculpture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d61595f759c7b69c4294d7c96f130d2424ae2e2f5710093dc0f4a8ecfe16f4c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEE210451101.
Andrew Thomas & Benjamin Wittiber & Eckhard Kopetzki & Emmanuel Séjourné & John Thrower & Keiko Abe & Matthias Schmitt & Ney Rosauro: Marimba Dance
Konzert für Marimba und Percussionensemble: Grüße
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31b6cf77ad1c396ccb1c1f04e0ec84f0f7223b723bf5d69acebacc11acaa934. 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/DEE219745001.
Konzert für Marimba und Percussionensemble: Lament
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a358cd3914d25e24b9d508cbd9ffe45e9a557ef25fb280a2d4bef3d53f4cee. 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/DEE219745002.
Konzert für Marimba und Percussionensemble: Abschied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7122c1dc23508ce94db9e578c21d973f344cfcc15987a3bc35f3187c73912b. 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/DEE219745004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a420a8d693a08f899a12d56315b55297de9cde3ee07fe5207b5944c99cd2d75. 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/DEE219745005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfacca09f97b052407cde88244cbc887c26cd82258b081fb0c199db36002e2cf. 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/DEE219745011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478bfd67f8138f3fd114cc77871beeea25a7dbcbe60ef9d086080de7781ce687. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEE219745014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d7f0328076e3944b9df58634f255c043a954d1206d320bb9cfc68dfd61d32b. 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/DEE219745017.