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 0xf8ec830936d3f2903fc47fa4a4de8411f7e07260350e3e842d173521758a0c16. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45c12f12-bc75-4a0c-972e-314bd55ae303.json and https://artists.proofprofile.net/proofs/artist/45c12f12-bc75-4a0c-972e-314bd55ae303.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
12 Geistliche Gesänge, Op. 13: I. Kyrie, Gott Vater in Ewigkeit, SWV 420
Schütz: 12 geistliche Gesänge, Op. 13 (Complete Recording Vol. 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 0x9f00e815e88db224267526ae4396d2372be070e4d0ba56443532fec395e730a5. 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/DEB111200201.
12 Geistliche Gesänge, Op. 13: V. Ich danke dem Herrn von ganzem Herzen, SWV 424
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1c17e9fc8f9bf416c092839f91cb46c6eabeefb04ca399be29633902d61049. 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/DEB111200205.
12 Geistliche Gesänge, Op. 13: IV. Danksagen wir alle Gott, SWV 425
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01d33317d782537ed578d510b4546ad0a8a0c7e304e3ad2c32a02c5d8e7b33e. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/DEB111200206.
12 Geistliche Gesänge, Op. 13: VII. Meine Seele erhebt den Herren, SWV 426
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ea521b1fdd49987a1a7d02198f4389caad311224b8c5d212091a12baf2800e. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEB111200207.
12 Geistliche Gesänge, Op. 13: IX. Kyrie eleison, Christe eleison, SWV 428
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0365bc41721efa9c724924c32488659b5675ee69174c73bb68a8d2577476cb1a. 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/DEB111200209.
12 Geistliche Gesänge, Op. 13: X. Aller Augen warten auf dich, SWV 429
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1a7f9e8683897a27c9cb6dfb24735fa337a68b34b6648f1af0e21d5bf8061c. 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/DEB111200210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18227709385d974e335b059d4ad2f824a7ea7d1cc2710041a5aff2dd61f559c. 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/DEY320401015.