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 0x328be7d5f08837b3c6cdb7d4807461de7070f363c22f1d1559b37345af4d3062. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1206247a-43e2-419a-9805-97912d78482e.json and https://artists.proofprofile.net/proofs/artist/1206247a-43e2-419a-9805-97912d78482e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Ives: Piano Sonata No. 2 & Violin Sonata No. 4
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 0xeb9613a3ace0c53299eb233bb1fd82723b73a81ad945be482c48081a001faaa1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2304201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de91f615ee3d8c0abe635757b22134967612a2775d30d6148ff8b52757c945d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2304202 — a six-check JSON result.
Fantasia in Sâranga: II. Presto con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f59e39edffe9735b1bbb41f731bbf8784e467a9d4d20202104fd32705458722. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2304203 — a six-check JSON result.
Charles Ives & Bernhard Gander: Piano Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3fa413b0fe9c17bdf6c7e4e5a49e1205cb7c348eef4ab3afbee935711c3eb9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEX1609010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb6df9a4b4c665b8051adc21a829f4ff6eb03de1c175d338589d9e8b58c8986. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEX1609020 — a six-check JSON result.
Chamber Concerto: I. Corrente (Fließend)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3939baa5c1a2c32696a0473558272c093ad6511efc0857dd2f9a1155b4f7c721. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEX1609030 — a six-check JSON result.
Piano Concerto: I. Vivace molto ritmico e preciso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729785ac351452a39df55f3ba76858d6f89dc9d1dafb268cdca116d7ad95d653. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEX1609080 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fca6056166f842c7049e17c16dfbde837b9646653db677a471f4b71cd821a2c. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEX1609090 — a six-check JSON result.
Sonata No. 1 for Violin and Piano: II. Movement II
Pierrot Lunaire, Op. 21: I. Mondestrunken
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ecbd5be098d6c61e9b42b95671ec4ad25eb0476e2ff6ad5301a81c5d7abc08. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d618fd97d2b9c08597656968de447259e82acf6cd48163f9c9249c6e16aefe6. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972202 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad8810083c69c4f8841f1a52f9463fdaf82f30790e47aa282bb995257c88d2a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972203 — a six-check JSON result.
Pierrot Lunaire, Op. 21: IV. Eine blasse Wäscherin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fcf18a4f5cc9832258a42f75be105fd15d7da785cadc2d2ba6b7dfa366a49a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972204 — a six-check JSON result.
Pierrot Lunaire, Op. 21: V. Valse de Chopin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddea626f3305ffc6d071b47d8e9a54ddc461834a834fb5980eb8030b9f45e3c8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972205 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ad7095120449ed3251db325bf3f001ad1210e6c4e913aa469058577e669f2f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972206 — a six-check JSON result.
Pierrot Lunaire, Op. 21: VII. Der kranke Mond
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433cd6bb8762d299b9f48a69cf87c56fbcdaba2a5ce62f45e0412d3e57d2f02c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972207 — a six-check JSON result.
Pierrot Lunaire, Op. 21: VIII. Nacht (Passcaglia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c06ef56858030f92597702eedf7618af8bd7704a51f0fb6ea9da24821cf663. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972208 — a six-check JSON result.
Pierrot Lunaire, Op. 21: IX. Gebet an Pierrot
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9902989398d4057d88b7b7140058c5e98b08f7a31692e23c04765fa77078982f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972209 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffca0c01ea0395c2826ce5531c1e88c3c59142a8cf450e0fbb657fea180eb401. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972210 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1e175953922effb185c0ee3bb4faf1cff8441353b22876bf60dfdb30daec68. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972211 — a six-check JSON result.
Pierrot Lunaire, Op. 21: XIII. Enthauptung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15733d7e83ab63e87e2701aa246cc6b8ee34696bdf93dc07b46a8643d7ec8bb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972213 — a six-check JSON result.
Pierrot Lunaire, Op. 21: XIV. Die Kreuze
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88ea1cba05737a0f3e83be4ea1d962d4a06b6bbd794dea337da0cdb7846557d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972214 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cce55f1f15807ff5818c3efcf6336895a7023908c168d44991529d7d00662eb. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972215 — a six-check JSON result.
Pierrot Lunaire, Op. 21: XVI. Gemeinheit!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dea476e824afd42ee6cacf73ee9405000392a1f2323da777e18ad2f8d6f91d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972216 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb200076df6ea57c83aba567baa288f4ba43af84db52f819cd3a5ade646db2f12. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972217 — a six-check JSON result.
Pierrot Lunaire, Op. 21: XVIII. Der Mondfleck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0ecafdb50993c7e2ab728437692efb3d772c5426e8f55b9da79706a4565e79. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972218 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1219c5ccd3f6aca9332fea0e63ac1db262df7dd6c2c64d677714f705dfea7941. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972219 — a six-check JSON result.
Pierrot Lunaire, Op. 21: XX. Heimfahrt (Barcarole)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1996eeb942404517f01b715905f441dffa1c748b0900d904e12e59ff4f52e0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972220 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5b83601f8c431f6250701807f675774a2c66bc0d256c9d6c52dd1208da3bdc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1972222 — a six-check JSON result.
Magnus Lindberg: Aura, Marea & Related Rocks (Live)