Spektral Quartet was a Chicago-based string quartet active from 2010 to 2022, blending traditional string quartet repertoire with new works by living composers. Over its twelve-year career, Spektral Q
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 0xb10f8216b0286e9a7fca50bc88e32dfa9aaa3756ceaef6a31e8abeeda9a84947. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3ca8d6b-652a-4d5d-acb7-bb77a4374ecf.json and https://artists.proofprofile.net/proofs/artist/c3ca8d6b-652a-4d5d-acb7-bb77a4374ecf.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 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 0x3a89913d57068e705c1b88cba78ced3c64fa143a69993c6f132f49718f333a0c. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US7MN1901426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959bfe424e148dabe47f8187eb2768734f94e5d3564f2cc6a49feadf4f5a3255. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7MN1901427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4021da37646be216b8b1bba9e45f8240e04abed5aabbe381afd049f1853fef0a. 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/US7MN1901428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf074772c0af1c4e946622bf656982c7cc631d54a1e710e76a83a897f201fa4a0. 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/US7MN1901429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e210a7d24b7974634fedd23cd3f9dcb50f94b96436be2b6bc048205d6e13c5c. 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/US7MN1901430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266ae3ef26c5750158e010962c9ce1c049a86d62aa763e588bf0105827b77d9c. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/US7MN1901431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f34a1d25360440f68a353608405ae6aee9b8edcd3feeb53650f5f4074c37e9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US7MN1901432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94c9835bb03d104bf7978434d7b63ed925464cb76f615e20c05d6f8cb18f457. 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/US7MN1901433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d5d1da2786157fd44af45f3009ae7a068cf792eff5a5f44979aa593b02dddd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7MN1901434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a864b2e8c326b99c368bc2c5817f5d7525b8a02e55604f6d6797eab1cdf951. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US7MN1901435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01113972c8fe4ec160bff71d1d342c6728690f5e582092b85dafd3820baaf8a8. 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/US7MN1901436.
Yo Soy La Tradición (feat. Spektral Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08e421a7395643c5e4663a94c34acaa1764d1e3e3da69996dfe886f6a7e617a. 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/QMAAK1865848.
Papa Loko (Arr. N. Joachim) - Interlude. September 24, 1918
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6bdf22eb992d5bf98c66477c600a594085297b7274badf32333398607d37a5. 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/US7MN1901042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60774ce388c00eba9f7f4b431cb0d628860b3151f491ef0d4c95145ba85a0ca3. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7MN1901043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013e42ec7d880858e6dcaddf0963d148aa6a6bd59582d8c443eb387f7b157a51. 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/US7MN1901044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d2158c058469475588aa080fdd7380cb573fa699781aaf78f7ca47aa44ed5a. 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/US7MN1901045.
Manman m voye m peze kafe (Arr. N. Joachim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b5728a79b5906a16fb2dab67a5585dd0750010b175339d04d1b3c13532439b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US7MN1901048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9294e2187e986e31770f9226817a8feb36aef90334a4bba3cceb9ab562426ab. 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/US7MN1901049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc61c19a392f64c1758b87335d0d0e5e0b43bb8e6c23a4e2214ac2edcd01c9f. 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/US7MN1901050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa285955ba5e40b2e5ad3dd8c0532263eef4de029dd45efc03cdcd364711596. 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/US7MN1901052.
Augusta Read Thomas: Aura from Chi for String Quartet
CURED (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3425721b32131149aafbb8b57440419187242830a196bf2c4b63eccc019a415. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZQ7K2100005.
Augusta Read Thomas: Ritual Incantations