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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ef11d34e06074d201a99549f7086bf4f684bf60635053199c28b75479d6fe5. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7b10d60-9975-4cf4-8f12-ca8da2507ef9.json and https://artists.proofprofile.net/proofs/artist/a7b10d60-9975-4cf4-8f12-ca8da2507ef9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92fb6b17e810b25a49e9ac3c2c91f2d4a1a1dd582768c5309887cad9b8ead0e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/US9930511839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc8a82a696626ed8bbb94614ff776ce5aca7cafd7d869a7760b64222edecada. 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/US9930511842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56699f8f23b88db155704df12cb2f00ff1af1ca1bcccd8dc993091d8d5ad1dbf. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/US9930511845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b68f6bab9eb4c21160864eb33ff548db6c6329688bbabdb848a44cc6ed665d. 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/US9930511847.
Glenn Gould plays Hindemith: 3 Piano Sonatas; 5 Sonatas for Brass & Piano; Das Marienleben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585aa4268fd131cbde00b83d02924b74971785e4cf72cceace9b4978184b6667. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USSM19921226.
Piano Sonata No. 1 in A Major: II. Im Zeitmass eines sehr langsamen Marsches
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982f88fa50ed019156723265833a76fbe3c450cd09785bd692dfa8e405b3bde9. 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/USSM16601423.
Hindemith: Complete Sonatas for Brass and Piano (Gould Remastered)