Sharon Isbin is a multiple GRAMMY Award-winning American classical guitarist and the founder and director of the guitar department at the Juilliard School.Maurice J. Summerfield: The Classical Guitar.
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 0xda9eba874aa5753afce5e3b7fe0e498707b8c3f55a3a1e67276fef8c8132fb9b. 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/bf3bf7d6-07f6-4523-b2c8-387664d24a98.json and https://artists.proofprofile.net/proofs/artist/bf3bf7d6-07f6-4523-b2c8-387664d24a98.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Latin Romances for Guitar [standard] (standard)
Rodrigo: Concierto de Aranjuez: I. Allegro con spirito
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 0x8a4e3c4989a8cc816b37136138e7f2333a985781e2c622bc382fcfd23b977319. 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/GBAYC8900271.
Rodrigo: Fantasía para un gentilhombre: II. Españoleta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2209e716ec6d08190a3f5c90cd25c58c3291a81a914d2c9e83ec4178994eec0. 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/GBAYC8901427.
Vivaldi / Arr. Pujol: Guitar Concerto in D Major, RV 93: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e6b0f1ecc2e1a2a2d93eb50b09d1757b34cf33186c856e07310f0bc48aed15. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBAYC8904365.
Vivaldi / Arr. Pujol: Guitar Concerto in D Major, RV 93: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad8c90a4290e4752a4372d8de54ddf42cb1c56df5b23702ea1b36f5af604dd4. 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/GBAYC8904366.
Vivaldi / Arr. Pujol: Guitar Concerto in D Major, RV 93: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ed47860beb16a7b1821b5362a9063f5c59f9fd109f57747662438d78ad30a9. 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/GBAYC8904367.
Love Songs & Lullabies for Guitar and Voice
Rodrigo: Concierto de Aranjuez: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242a712ae9662d39930a31a4be58f820bc58e8401d535e04a748f843979e634c. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBAYC8900272.
Rodrigo: Fantasía para un gentilhombre: I. Villano y Ricercare
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bf70173283fe054ed4ff86d0ed1e050b7f6d3d43aa6fce7284f714c1994762. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBAYC8901426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2209e716ec6d08190a3f5c90cd25c58c3291a81a914d2c9e83ec4178994eec0. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/GBAYC8901427.
Vivaldi, Bach, JS & Albinoni : Guitar Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca49879f06ccdf3b80078ed13477b6871527a72ebce0cf08bdbd84776d29919a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/GBAYC8801663.
Rodrigo, Villa-Lobos & Ponce : Guitar Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4fc02c7e96231c1fa390ad6884d5f92794fa218dcd96a607811814a659a4da. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USQX90900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543e4ec66022953c63dba07dd97178a242e57d3af5692820f29927bb9d00b7fa. 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/USSM11103125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6b47990d0799eb6f5d632381dda3f41e9fcf90acbfc9701b4de40e3ef36aa5. 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/USSM11103126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8738089af36ed3b7635e61675c7600bde09325eb496203f03a5b1b6c6ca0db. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USSM11103127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea23e86548e42c7a3dd81e0e4b5b94f1ae7e8fd55fb69875820ccef57dd13379. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USSM11103128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d16eff6604c97115e5fe96869199c038be56f8fca27d592fc21482f2a2601b. 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/USSM11103129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb621ba617a42471aec19995c098db97529a763ab9ef35c338cafef75c5df5adb. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/USSM11103130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733dde6d5583219ed9c12cb7e904737292f24539ec7e077f194f438c0d28d0b6. 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/USSM11103131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66bdb57e9401c862bd3496a7f5e5babeae4575f996a427cc6969c433a17d575c. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/USSM11103132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73de2762df6d22b6401f66c7be317667c0a984163024280b22494226f5f09fbd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USSM11103133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00b672cc741c061f91c642d61d516e0d64f778ad775a4f54978b45684a89e1d. 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/USSM11103134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22c1d13d51cd238514174f2a1b3de81b1b0a4cab0390293bc9709fab64c5608. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USSM11103136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4e149368290e7fc73984805813d4b782bd4e974807e787418b082adf301f20. 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/USSM11103137.
Granados: Cuentos de la juventud, Op. 1: No. 1, Dedicatoria (Transcr. Isbin for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e20201d4cd614b10f47216a348fb1628784b983f834228d08ab6422bf3255db. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/DEA809935300.
Bach, JS: Guitar Suite in E Major, BWV 1006a: III. Gavotte en rondeau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ffb914638273d6e471b88d8d8df54c6e982f73314bf5fdf9abd56d66048ff0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBAYC8804945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e6b0f1ecc2e1a2a2d93eb50b09d1757b34cf33186c856e07310f0bc48aed15. 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/GBAYC8904365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad8c90a4290e4752a4372d8de54ddf42cb1c56df5b23702ea1b36f5af604dd4. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBAYC8904366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad8c90a4290e4752a4372d8de54ddf42cb1c56df5b23702ea1b36f5af604dd4. 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/GBAYC8904366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ed47860beb16a7b1821b5362a9063f5c59f9fd109f57747662438d78ad30a9. 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/GBAYC8904367.
Villa-Lobos: Floresta do Amazonas, W551: Melodia Sentimental (Arr. Barbosa-Lima for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5466ac493845665120174ac679f3b5b7e89abfd956faf2d5b5f340b8cef799. 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/GBAYC8801674.
Gershwin / Arr. Barbosa-Lima for Guitar: 3 Preludes: No. 2, Andante con moto "Blue Lullaby"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf702f9ec2c55c7a3241a3d08179b4223d3e2eae7328f8219456d77be32146766. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBAYC9303284.