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 0x079d98c995d8106ee1e338c04cd79759e049f782dc5b46cd3b46a5c89415469e. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/140ca750-8ee3-4930-b7d8-ce325fa9ac3b.json and https://artists.proofprofile.net/proofs/artist/140ca750-8ee3-4930-b7d8-ce325fa9ac3b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x2595aa00ffda7809cee6b178fb9e5999bd53fd8b69933c25fc32a99e58258f63. 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/GBF079810800 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Jarku, jarku, klouce milé
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfc48e0003088b78badda2671f18fd85a160a5abf8750ceb03302e7633b7a1e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810930 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Necitelná vodní moci
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39baa2d83f6f3c3b5d5412de2d431c7c94db9c92a214cc43d3bffe78b90fdf5e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079811020 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Hou, hou, hou, stojí mésic nad vodou!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227d909b7a33aa7dc6bb856e89fb47b32d2c3fac70c39d82111db07e69537679. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810810 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: U nás v lese strasi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62ab0d8d7fbf259c3915901b5a4eb692328705203731d9332aa1536d6f30e12. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810940 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Aj, aj? Uz jsi se navrátila
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041da5755a306ae5a9a7091acb761f4d2cf83613d3bba35a837b296e37c5c7cc. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/GBF079811030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91696a81a42993963763d960f0f75555257477ada4f707b96cdebbd23423ae37. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810820 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Jiz tyden dlis po boku
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f27512694b38a0c7753618d851a5072dbcb9124fdb4d052ba0b811f5d91db5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810950 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Vyrvána zivotu v hlubokou samotu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf1b995529b258d72942bae63eeb1745bd8fc463cb808fa7612979221e00215. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079811040 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Hastrmánku, taticku!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb557c85edd8c6b6b507d47e9d42243428cfe7cfafc6bd21cbad028ab784ceca9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810830 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Zda na chvili princ vzpomene si prec
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2018a409b11d5f7079bdf11b2fd796dabc066c84bce2bf18999d1595ff51f972. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810960 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Ze se bojís? Tresky, plesky
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac356a2477c04fe4bb46a36dd36b6c75260438734f0f9c713e94ce4cc57f2d4b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GBF079811050 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Sem casto prichazi a v objeti mé stoupá
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea7f66d9c1379786f96dd9d9e8b1b1b0e0f37e6932c5f7c9f0253da60c3635f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810840 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Slavnosti hudba - balet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b28478f11ab666cabbd9ccce994e63d6e906e5cc7db22da69085a286f1ec00. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810970 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Mám, zlaté vlásky mám
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a164f85063dee96349521efbb81f79a9288b53e36906fce2b447ef7550f8aba. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079811060 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Mesicku na nebi hlubokém
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78b367dedd42abf7f8a14dc481a5bfc5f7b63f16b1b53fbd95820824c40106f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBF079810850 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Cely svet neda ti, neda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7749c3d95a01dc4b6c5196f3ac1eb8f3174b7bacb246a0739a7536b627e6c2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810980 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Bílá moje lani! Bílá moje lani!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc38d83dd141f6d1dee63b1c974bb35eeae9c06d22ac2d04c2c879250205cf33. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBF079811070 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Ta voda studi, studi! Jezibabo! Jezibabo!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10077265020bf123a0373c3e74074a031c72bbeb363386d4d913b844e7944942. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810860 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Kvetiny bile po ceste
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4ea290df9b0498309ea6ed117260bda1c44703e5dd32bf40f2a2dc2b388e2d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810990 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Milácku, znás mne, znás?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafe88f3b4d10975845ece70e8bdd2ff7e78fbf41249e9009b89f05457779518. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBF079811080 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Stalerá moudrost tvá vsechno vi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4955764d4e07325a8fce4c85a99d0cc20c04330cb6b6f95c8f846c1432a9a834. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810870 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Rusalko, znas mne, znas?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72886db17f5be5260eef6aae99409b54c0b124553cd5bc6bc7f874fa40d76a94. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079811000 — a six-check JSON result.
Rusalka, Op. 114 / Act 3: Líbej mne, líbej, mír mi prej
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685a155bc4b694adbb7fbd314cf1bf2a4a200b7b1f7ed5d32b42dedc15eb3b96. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079811090 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Tvoje moudrost vsechno tusi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0385831f35b84c2bfed83c929827627452e8f34fa647fa8543f0c8abb15e90fc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810880 — a six-check JSON result.
Rusalka, Op. 114 / Act 2: Vidis je, vidis? Jsou tu zas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44ded0478fdfa5dd47b3f92fe5a718d6d98cd0b3a6bfc93250dbc30b2daecd3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079811010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303785511ce0451228c2785d60503b080edadf5b105b728f36a2fb84d85451d4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079810890 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Jel mlady lovec, jel a jel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d2b6b3f3c99eaeadd3188f3b93616155a26ecd6dcdb6ce5b6e1e02c2195a7a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810900 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Ustante v lovu, na hrad vrafte se
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23471cfa02be88fa2b85bcef2891c4c8fb4d708496138d342976648211c4c831. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810910 — a six-check JSON result.
Rusalka, Op. 114 / Act 1: Sestry, jedna scházi z nás!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf884d98eee4b50f9c2ff0e61bfb7c55d4b634d6b4e571630d553ea6193085e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079810920 — a six-check JSON result.
Fišer, Bodorová, Mácha: Prague Guitar Concertos