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 0xa519350040bfab0441ac7bfd7eb102a397f4a67288dbac1443bfc4b0f15a1237. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73003545-3845-40fe-900a-273abd7aecde.json and https://artists.proofprofile.net/proofs/artist/73003545-3845-40fe-900a-273abd7aecde.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, Händel & Vivaldi: In Dulci Jubilo - Weihnachten mit Ludwig Güttler
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 0xdfe0a562cb7433eeb89273e361a6a3a591c68bf2339ccafa96f15b6a7e32001f. 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/DES380001030.
Christ lag in Todesbanden, BWV 4: I. Sinfonia
Bach: Easter Cantatas BWV 4, 31, 66, 134
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a85c155e1de50a1d1b6ddf1ec48e265e64da541447961a88c3a7844afb92ec2. 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/DES380001870.
Christ lag in Todesbanden, BWV 4: II. Verse 1. Christ lag in Todesbanden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5a1f7d72e7f8ccfffdacb48eb4234e78beee7246325b74cd92ff78f5c6d359. 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/DES380001871.
Christ lag in Todesbanden, BWV 4: III. Verse 2. Den Tod niemand zwingen kunnt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd462c84c543a87f7426090a273853c7d103dd06314fbd7c915a3d57e701aeb0d. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DES380001872.
Christ lag in Todesbanden, BWV 4: IV. Verse 3. Jesus Christus, Gottes Sohn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417e4957277e05db3e8637cb4ba7d44540a213ceabf252b86ba43a61b3067d49. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DES380001873.
Christ lag in Todesbanden, BWV 4: V. Verse 4. Es war ein wunderlicher Krieg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abba0464138a9529fe7f6ed0f7e2ef1af17e45336b7ea2599bb727f841a3dea. 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/DES380001874.
Christ lag in Todesbanden, BWV 4: VI. Verse 5. Hier ist das rechte Osterlamm
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b234ca8825c1523d49a05ca228d21f748ce107daed337b745ea918d560cf456. 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/DES380001875.
Christ lag in Todesbanden, BWV 4: VII. Verse 6. So feiern wir das hohe Fest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632c083e3c3016b77f38543e329a7b8bfd261bc8cc72ff3b1a9ceef8b43325a6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DES380001876.
Christ lag in Todesbanden, BWV 4: VIII. Verse 7. Wir essen und leben wohl
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054853c8c81ff9160e44f4f36afb1b7b24c010841c6c6a3e95dfee1757fb2181. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/DES380001877.