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 0x41b6bf4f3c6ab968823564dca3962c6e3d5d816541a446dc0a8e8ad8b9694132. 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/6192d777-a372-4e88-9009-3c35a641716f.json and https://artists.proofprofile.net/proofs/artist/6192d777-a372-4e88-9009-3c35a641716f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Offenbach: Barcarolle from "Les Contes d'Hoffmann"
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 0xab92a95dbda209fd87f7b978aa910c0c30b7b7a55ead8e509f5041f00a23f1cc. 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/TWU710701253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fa6595b78709daf759446b43986f165263b2bea5581360772bbf74839d5d43. 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/TWU710701254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68adcc0deca869d80645f44c99bd03ddd44f164a9efd3cf5e23bbba72f1cfc2c. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/TWU710701255.
Leider ohne Worte, Op. 62: No. 6 in A Major "Frühlingslied"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bff508612ade0ef66cfd5f0bb7ba884b45f0b9ccb1b3fa7bbdefbbef42c57f9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWU711902081.
Marionettes, No. 2: La Poupée valsante (Arr. Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8336639db0d6e9b1b85d1293fcbf18022e63c242cd2428b4f135b497e1e037. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWU711902082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ace2ffa95a9c1bfc5c5e7b0b801c9d1a18536872a8fafe7b0ac0ce51cc23bef. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWU711902083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46dfdc1b5715ab527f9116755587fdb803a5f6169c18a887f55f9683c6fe5e2e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TWU711902084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a8b69a927b7e34141c9397f5268bc11bd36e87976b3dd66a253fc157eb7ba4. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/TWU711902085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d34686ea3aa356d487e2a99484333d1e3fc0f8ae9f99178ea833a8ac521b1a. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWU711902086.
16 Waltzes, Op. 39: No. 15 in A-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48438906e738a21f495dde40cf054b7c787bdbeaff2875d67807c1a5ad4c09e5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWU711902087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0fd0666f7c3ed71f48504201999f4137117c3ff60ee0efde7ba961d747f207. 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/TWU711902088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd976ab3b1f76c7d7a7f4390f4c3fcb9f5473e7b4c031bd9ae6b0ff8fc33be91e. 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/TWU711902089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80586c69a0de5f9cd9da747afaa3ff5089aad17eeebfa6aa948234e3b0f0aea1. 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/TWU711902090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d041885df25126847ee5b32df7a235adb40c4f55212de802d404985d1ed514d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWU711902091.
Cantata Heart and Mouth and Deed and Life, BWV 147, No. 10: Jesu, Joy of Man's Desiring
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53bf235245e9420814f77199fb308018a48c5fd419c0e59f0971ec0418c21b6. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TWU711902092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d07ebb451d35fa9613c89317b2e0d11a2827c424d8d4dc401fd89b1124af0ca. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TWU711902093.
Schwanengesang, D. 957: No. 4, Ständchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4a58e0138db44b2f1e89c793e20522c05a528d1f21230c34adea9b55c77864. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWU711902094.
Cello Concerto No.1 in C Major, Hob.VIIb:1: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe67c58125bf3795f65d3e1d80e1cac24f3965be0fe8dc14fbfbad6a9292789e. 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/TWU711902095.