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 0x48d1cc8c085cf2493bab728c6a59a19fc173e9445cd0baf1a7e14d34b9306752. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2221b3bc-69bb-44a8-b6c0-06ff79336d59.json and https://artists.proofprofile.net/proofs/artist/2221b3bc-69bb-44a8-b6c0-06ff79336d59.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Wagner: Der Ring des Nibelungen (Highlights)
Das Rheingold, WWV 86A, Scene 1 (Highlights): Vorspiel
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 0x85dece3b14652a1f01ce3f9376db2728bcd7af358acece330512d1b2a3fadcb1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191828901 — a six-check JSON result.
Die Walküre, WWV 86B, Act III (Highlights): Hojotoho! Hojotoho! "Ride of the Valkyries"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358ba3bd90a57ac294fdfdbeb19830b16e530728aefb03b0861428f62f8b0476. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191828918 — a six-check JSON result.
Das Rheingold, WWV 86A, Scene 1: Vorspiel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4927612123960ff2aa959e5982e1ebd65844c6d0497f22840d62e6ab299434d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191518501 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50c95a80d66d6b0ae65c2c10a11d27f219eb416c30be3a5a75649bf16e87b64. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680701 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25f18be8a0636535797ec335e19586fcdcb1b2c8f6aa8b4c4bd4b157b814b55. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680702 — a six-check JSON result.
The Four Seasons, "La primavera" (Spring)‚ Op. 8, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa20bdcf5df7e1b81f7d41ae744e1e15cc251c161a5160ea1677e0ac0b2decdc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680703 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ee3a93e5238bc8b462e34a9719a1a05bdc582296a31bd6e5b2368f82a9b6e6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680704 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7662d53179071c12a92197e533458aad6787113aab5d7bd7434a65a44a7b1c60. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680705 — a six-check JSON result.
Waltz in D-Flat Major ("Minute")‚ Op. 64, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b25ebe1c0b8d75e8824963ebd44bca97212bb1ae134afdb26fb6f3b319705d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680706 — a six-check JSON result.
Tritsch-Tratsch-Polka (Chit-Chat Polka)‚ Op. 214
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8a77618b4d0ccdcb50e587abeb03659972d88b055cf6975ecd3c23456bd228. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680707 — a six-check JSON result.
Brandenburg Concerto No. 3 in G Major‚ BWV 1048
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27671f0f992775610848b5a1274ed1b0c35bbc7c0b147d043ca941dbaa80d3eb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680708 — a six-check JSON result.
Le nozze di Figaro (The Marriage of Figaro)‚ K. 492
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e9b96ff35add261de895b7cd79e79bdfb151b6c03b6eb7c02ed24787ed22c5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680712 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9ee5686eb0578e8a68327637230438fbe0dd0c2461d7552b06795d634f09df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680721 — a six-check JSON result.
Classical Music from Ingmar Bergman Films
Impromptus, D. 899, Op. 90: No. 3 in G-Flat Major: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8bbe6ca799a8b6a5e3d2b92a53797075c892e41e5f0ac807257cc7386b4d24. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0603413 — a six-check JSON result.
Suite for Orchestra No. 3 in D Major‚ BWV 1068
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a51a07c6137a1738da239d1a3e755579592506840c7306d7d4912de0f6e2451. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680601 — a six-check JSON result.
Bagatelle for piano in A Minor ("Für Elise") WoO 59
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123c34e62f16261dd81e9a90df4be2540a38e3c44d56c5130c44f9e3447b2c75. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680602 — a six-check JSON result.
Piano Concerto No. 23 in A Major‚ K. 488
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e3b425d70bdfcd90f30c6f66cd64f4adb6e7ad569c4307729cf5373dfbaf9d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680603 — a six-check JSON result.
The Four Seasons, "L'estate" (Summer)‚ Op. 8, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544ce4d211a83a600807afe591040568d921850a5bf648297f8ebc2dc8ff8999. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680604 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2ca36b9f1d6c49de6cb1733a7f43ef828371ad4b04b81c249a27c7633bdbcd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680606 — a six-check JSON result.
Waltz for piano in A Flat Major‚ Op. 39, No. 15
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c496d10b602564c974472e0d7097c6a159064bbc92f889f4e32a6cf0475de5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680607 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9292b2373489f2332d0b47d09570c43c52cd38ebd49bc2462712a79607991127. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680608 — a six-check JSON result.
Spring Song ("Frühlingslied")‚ Op. 62, No. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed818aa1e7cc792efc000de4f44c718e6e2b62440a7450f8de84eb41f075ec49. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680611 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea692f1e8c8cf14425754ff6f0d20f89518f8ad06189ed3e2e08e3680b6b0ea. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680613 — a six-check JSON result.
Symphony No. 5 in D Major ("Reformation")‚ Op. 107
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca484d5d99d990343e150f130edcb5890e31eb4eeaca53ebb42033c06d623bb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1680623 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f93b9672bdbcf35658fecbfb43fff256849f6e7b48b06a9809f511bc3015706. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW71290311 — a six-check JSON result.
Wheeler: Wake, awake, for Night is Flying / Hindemith: Apparebit repentina dies / Stravinsky: Mass