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 0x699cef69b86bd61f72d5b37f043882ed91aa3457b724d00ed855b8b85c37061e. 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/969de167-4b09-4e46-bb26-a6ba46b2e048.json and https://artists.proofprofile.net/proofs/artist/969de167-4b09-4e46-bb26-a6ba46b2e048.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Adeste Fideles (Arr. for Orchestra, Ensemble and Soloist by David Willocks)
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 0x375c6c8c24b149b78c24a30228c71b4875d20dc7beeda8dafecb2ec29aa9d8d0. 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/FR50X2407901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929d8d8b5868680223a8e40968d446a4245e0a003b6cc18a2b6542465b80d493. 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/FR50X2407903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244f73679a723491d8ebabcdb584352b298cb16cbc53b5b7fc9a7740ee176871. 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/FR50X2407906.
5 Neue Kinderlieder, Op. 142: No. 1, Schlaf mein Kindelein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89406c723affb17a68528a228c196a5ac9e62b9a8ba5d4130a0b75b831a6960. 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/FR50X2407909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec01a4dc41c0cbec67ef744f51619ac022f2db4587c7fe9fbbf05bd09cf0389. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FR50X2407912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0546dbf03cdc644f65f12ae6d4e2d0d26812956a227a12cb675d68fdb74145. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR50X2407914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a0384208f9ede8975335fb5e15330cfbacb1e30b050022f3cd441338a84b3d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR50X2407915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cc7023b050e4ed6d6c3f2324a9c4f49e16e7b081aff5b4c17cae58e91cf526. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR50X2407916.
Hänsel und Gretel, Act II Scene 2: Abendsegen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9a57fa86ddee6c05392573cdbab65aac481f0e718c53604854dd7c23ff5b6a. 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/FR50X2407918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3e727a8b72ede53ca6e90d645617560e52e77a5c935662a776e1176504f7cf. 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/FR50X2407919.
O Jesulein Zart (Arr. for Choir and Soloist by Chris Hazell)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77983df6a19513dfae62a3ad0e10559480848c139f2905524593151f6fda0274. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/FR50X2407920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ea90c2dd3a570990c4c41961e0a79f464f8cdaf33691abb5086f479c349d30. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR50X2407921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbb72be92be678916cbc0de401508bd8f8f30b8f01a6b02649eed068a2aa05f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR50X2407923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71db1488678a7af64959d51a8f34c7b6fd450bef9bd2be498278027ea9e0187c. 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/FR50X2407924.