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 0x32629e3e9987ddcd31d02d4d82e84e996f15ee98e28ef1ceab2182e32d2a204d. 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/75f0e0bd-ca8e-42e8-8ad4-a415b1e7a594.json and https://artists.proofprofile.net/proofs/artist/75f0e0bd-ca8e-42e8-8ad4-a415b1e7a594.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Montag: Sonata in E Minor for Double Bass and Piano
Montag: Sonata in E Minor for Double Bass and Piano: I. Andante moderato
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 0xf462e960e0707033b65ee1129d8248c5e1c9e0a1f33bfdd35da2c714bcab3da7. 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/QZLYT2300108.
Montag: Sonata in E Minor for Double Bass and Piano: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdf91305b74c61b8b13110a80e4c1f38fd66ae2d58ea7edce6f78020f2846e0. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZLYT2300109.
Montag: Sonata in E Minor for Double Bass and Piano: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaa34e0a6546c6a193dbeadb877409f5c2190619754480176978e1b67833839. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZLYT2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf462e960e0707033b65ee1129d8248c5e1c9e0a1f33bfdd35da2c714bcab3da7. 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/QZLYT2300108.
Double Bass Sonata in E Minor: I. Allegro moderato
Eccles / Misek / Hindemith / Jentzsch / Montag: Double Bass Sonatas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd81c28ed5761dd6556311bdd473c367f1afe4ba77cf536e6d5c1b6b887ca674. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HUA253175814.