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 0x6866a11bd9c4fef7903e21c9eb81d5bbddb92bd821977720878723c26929e550. 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/62a35a38-32ba-464c-b31f-12e891c4bfa7.json and https://artists.proofprofile.net/proofs/artist/62a35a38-32ba-464c-b31f-12e891c4bfa7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Agnus Dei - Lamb of God (Baritone Horn Multi-Track)
Danse Médiévalle (Trumpet, Flugel Horn, Baritone Horn & Euphonium Multi-Track)
Two Dutch Christmas Carols (Euphonium Multi-Tracks)
Another Dance in 7|8 (Trumpet, Flugel Horn, Baritone Horn & Euphonium Multi-Track)
Ride the Chariot (Baritone Horn, Euphonium, Cimbasso & Tuba Multi-Track)
Christmas March: to Celebrate His Birth (Euphonium Multi-Track)
Quick March: Triumphant Prospect (Baritone Horn & Euphonium Choir)
Quick March: Triumphant Prospect - Baritone Horn & Euphonium Choir
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 0xa113a76319cc9997634e8f1ec6b53c3d6247dc2a594659e2936d8c5aa88630d9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLHR52153476.
Collection of Children's Songs, Mov. V, Jezus Houdt van Alle Kind'ren / We'll Shout Hallelujah - Baritone Horn, Euphonium & Tuba Multi-Track
Tuba Players at Sunday School (Baritone Horn, Euphonium, Cimbasso & Tuba Multi-Tracks)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cce5222388d84bb38d2160f8c9f02e898354bd572f7c2405dca1ae8b3f45d9. 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/NLHR52106198.