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 0x2950106da8d45aa39f5b73f17a0f281e39a93f155fcd392bd0e8e8ba96a1c50c. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6771eebf-a120-4d97-99d5-a6d58aa4bc53.json and https://artists.proofprofile.net/proofs/artist/6771eebf-a120-4d97-99d5-a6d58aa4bc53.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Brahms: String Sextet No. 1 in B-flat Major, Op. 18 by the Berlin Philharmonic Octet (2025 Remastered, Berlin 1966)
Mendelssohn: Octet, Op.20 / Bruch: Septet
Octet In E Flat, Op. 20, MWV R20: 1. Allegro moderato, ma con fuoco
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 0x56e256497e596b1cead830868e0a3c7098dedddeadead47e544c62d7919205e6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058102661 — a six-check JSON result.
Octet In E Flat, Op. 20, MWV R20: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b22bc6c346b10f12cc41248b0b323e8a69bc4dc3be9e39e3f243d879cb9f76. 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/DEF058102662 — a six-check JSON result.
Octet In E Flat, Op. 20, MWV R20: 3. Scherzo (Allegro leggierissimo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc776ed94964f1cba11cfa1d7d2114902c0dd38fe9e0fe9695c70f49878f1a2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058102663 — a six-check JSON result.
Octet In E Flat, Op. 20, MWV R20: 4. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e0c63944f4b2670f033971df8552f849f48cec1d5ab3b5c815c35480dd02e5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058102664 — a six-check JSON result.
Septett Es-dur op.post.: 1. Andante maestoso - Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6233e6d0ec02f814082e219ec894f86c4ec07ffda5c1016b11ec8d145f84f17b. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058102671 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150a8e3c6f62ec5324130dc9ac15eb8140bea231c8fef75f300cca4df11e9d39. 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/DEF058102672 — a six-check JSON result.
Septett Es-dur op.post.: 3. Scherzo. Allegro - Trio. Un poce meno Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37cb3ef72de3ae41c4367fa3133df0dba8970f0ed9e1a81cba8283d200eb553. 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/DEF058102673 — a six-check JSON result.
Septett Es-dur op.post.: 4. Largo - Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac81c1afca992e2cb629a748bda3dde5d1bb0ba4966311da392d5e9dadf6eb1f. 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/DEF058102674 — a six-check JSON result.