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 0x2f1e8ee82dba6f9d2d4c694e2160da53edfac08d78aa368014dcfb765d13e477. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92cf2dd9-0a45-4f6e-a457-1bcf7fd3ef38.json and https://artists.proofprofile.net/proofs/artist/92cf2dd9-0a45-4f6e-a457-1bcf7fd3ef38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rothko Chapel - Morton Feldman / Erik Satie / John Cage
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 0x1d447bdb9db5b38955d130913c382b8656e80bf267407a8f4733f568972411d2. 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/DEB331237801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c58d565cbbf2f1e44ee5aeed18b1141045d7b017ff369eb3cddecba9a52d13f. 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/DEB331237802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9785bccab315afbb510e66957b38ca273ed81861832c54b40b64f5b6c71e8648. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEB331237803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23d34d3b1c6cb70d05cd9aebd1b879d5b2304b0316614b8def38168ca66ceff. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEB331237804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6b2eb70e31324ed0d1c95adce67755f1a442d0ba1f9a14757886d6acd08432. 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/DEB331237805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774383d2755ad645b04d5b13d02375c3dfc1e32f10891aca74de04b183df9c08. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEB331237807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180483e97bc5c9a22ddaeaf38a4773b0b006094419e14264a2ecce5dd1159b58. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEB331237809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8babbf21c82e801bb5a08e13d110331aff27a4adb9f6d167800825bb17af4375. 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/DEB331237810.
Adagio und Allegro for Horn and Piano, Op. 70: I. Adagio
German Romantic Works for Horn - Schumann, Schubert, Strauss, Reinecke & Weber
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc975d872a0516aa47f4ccf45d0785236f1adee4acaf8769901b4af882c1e564f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USA220811171.