Joan Linda Lotz La Barbara (born June 8, 1947) is an American vocalist and composer known for her explorations of non-conventional or "extended" vocal techniques. Considered to be a vocal virtuoso in
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 0x5e0aca43a434517fa81f0cb9ae2cdea805acaf7bd56515bf8dc8a6196b18ba33. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d3377ff-6af6-4097-a305-1bd4f21e305b.json and https://artists.proofprofile.net/proofs/artist/8d3377ff-6af6-4097-a305-1bd4f21e305b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x977b3a91b6bb7a3b8ba5871c59ee718ad9f797a2118f186f9f409a079d976a17. 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/NLF058190002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3f894637c13c15a642c9b211bd774fcaa5d810d3551d8ef9881d47d5d57ab8. 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/DEN962130202.
MGV (Musique à Grande Vitesse) 1993 (for the inauguration of the TGV North European line): 1st Region
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec2102408689f53b30787e5a12ba9b2a6068b5612099f03de8cfbd75140f5b3. 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/GBF079410005.
MGV (Musique à Grande Vitesse) 1993 (for the inauguration of the TGV North European line): 5th Region
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be3c140edbe8b6491650fc99730cedd78268df479785d40e343cbe658bc2a72. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBF079410009.
Now We Are Free - From "Gladiator" Soundtrack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8bbee98127d02b5bfb238e4292e937fbc65b8d6a4ac7ca8063e2d32603b90c. 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/USUMC0000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4232d1a30b3da4909ceb0b2e4bd743636e410732c78aaf5b728de257bf3413. 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/ITB280600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5ccef1714425979f467e87d46b6f668b5f9fe632be1f30d271ec9bd459d087. 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/GBBBA9660020.
Piano Sonata No. 17 in D Minor, Op. 31, No. 2 "The Tempest": III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee569452af05f7f7634d5f5ececc2d4bde72a07455333bced6746de1f29d9a56. 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/DEN960300323.
String Quartet No. 14 in D Minor, D.810 -"Death and the Maiden": 2. Andante con moto - Excerpt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f996fb2fb60426758977bcea14bf2f2f74cba34fdbf74265e4bf53f5ac470ee. 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/DEF059004176.
6 Concerts transcrits en sextuor / 6e concert: 1. La poule - Edit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a403fc0cde04ca10cfbfdaa4ceecaa618e91443767ad42afa3070664a890332. 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/GBBBA0000260.
Brandenburg Concerto No. 3 in G Major, BWV. 1048: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cef5af334442da55c12678b2659ec90d1e323cd5abdc33e90d8f2a11b4180c. 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/DEF058200412.
Symphony No. 3 "Symphony of Sorrowful Songs": 2. Lento e largo (Tranquilissimo - cantabilissimo - dolcissimo - legatissimo) - Edit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5afc96ffb649b4920162f847451223bc80a5929e2c0bda42cb9c0bfc983ef90. 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/GBBBA9450210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de9d5d148830aa64920754038dbf01791bc1514b4602ca56e20eb67ec0a8654. 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/GBBBB0104905.
The Well-Tempered Clavier, Book I, BWV 846-869: Prelude and Fugue No. 1 in C Major, BWV 846
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809331f46e5c1a929ca884913ad3d9a0b85b71fc0738308ba3f1c6cd19df9304. 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/DEN960300350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f76601ac4616aa99d31805e4e0c2accafadf3e9e43e389491732c27bbf1217. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEF057403195.
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
Reich: Variations; Music for Mallet Instruments; 6 Pianos
Variations for Winds, Strings and Keyboards
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae67b3d7404c4d0bdd6deedf1b513d593981cac82bc3e848aaf2e05726bfbbb. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLA508312801.
Music For Mallet Instruments, Voices And Organ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2aeb1bd09d4697e06cdba6f8f83457757d0bec0b6a20e58c644b7e1054ee74. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEF057403210.
Reich: Six Pianos; Music for Mallet Instruments; Variations for Winds and Strings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a3f028380780730a54b2bdca7ed1bf7ab93f5d6c08d2766c14b5bdbd4b7c85. 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/DEF057403191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cac0d599998b1590715cf6d7c36cea538ad8ba0395f19156476bbb751ebc9b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DEF057403194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c6018d7e5bf6f3e500054554180458f65b8ed270324614a5b7f243630b226. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEF057403192.
Minimal Goes Popular - Klassiker der Minimal Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77bf8cb0f47d6a3981c27c78eeb85f7b296e44de38d06656c0794052673edcd. 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/US4BP1729801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5a57c5a8e21c55d911670ae5ab2364b9ac7e71db61adc78cbd5ccae2e4ce3d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US4BP1729802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8acb8986582884802e27d43f3e335b3c2853d7a5576fa99f9dd9c48ee4dc1dd. 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/US4BP1729803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e7587827a6b21bb0395e4549b7e5964562bbd0f340849185ed6bf7fd194afb. 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/US4QP0454501.
John Cage:The Perilous Night; Four Walls
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1c3348bb8a254aeb8b33b1a4f98c1e97eb4496c8f5884a587ba7057fb4ff42. 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/US87H9110260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dabe6e77455325df621d04e0abb3d9b21c021e0f8d902d73d6c368d65916b11. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/US87H9110251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7665453c2f93082c8a1962a9660efb8a7c3c999b421bb6032552770c73d8c9. 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/US87H9110254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a04d1d044d64905b8fdeb9e6cd77a5414e4955ceabb7aec2f6e479b33e0fe6. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US87H9110267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dc878b81c9f16dc0ba02d886af97685a3d765c18b4b2cd79ce3d27e502d13d. 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/USAM10500170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23698068e7e976291f36dc7c6f1eacd66cb28061e11ba718f322b32ac3dd9884. 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/USAM10500174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1552f8ccfbb52d40f94ee015c3c8b579888e8c30002ae13e61c407b15b84aa. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USAM10500171.
Hervig: Off Center / Hibbard: Handwork / Ziolek: Nocturnes / No. 16 (The University of Iowa Center for New Music 25Th Anniversary, 1966-1991)
Morton Subotnick: And the Butterflies Begin to Sing
Microtonal Works by Partch, Cage, Labarbara, & Drummond