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 0x55b59cb821df05444fcc8b6c8d95579579ec603492d840306b7609524765d0fe. 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/51e00564-a0f5-49b6-9d38-139019c4826a.json and https://artists.proofprofile.net/proofs/artist/51e00564-a0f5-49b6-9d38-139019c4826a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xce7c37d669e005d4606c0d8215e75c51bfd60ddc1d7d7c26dce79f80b8c5f80d. 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/CZA168103092.
The Bartered Bride, JB 1:100, Act I, Scene 1: Let Us Rejoice, Let´s Be Merry
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a554b10eb4703b79885b88a5d6be5a63828c04edde0fd4ecb3508e5ad53ae87. 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/CZA168104092.
The Bartered Bride, JB 1:100, Act I, Scene 2: It Will Then Happen like I Have Been Told! (Mařenka, Krušinova dcera, Jeník, Míchův syn z prvního manželství)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fa9c2ee559ee451ace0fdb54cc370cf150cf97534eaeb3642a3ae5ff439c3d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CZA168105092.
The Bartered Bride, JB 1:100, Act I, Scene 2: Should I Ever Happen to Learn Something like That about You (Mařenka, Krušinova dcera)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f15c42fcede2bfd23ad62afbbae7532decc4c73a3fb34ee2b5c127f403f6fdf. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/CZA168106092.
The Bartered Bride, JB 1:100, Act I, Scene 2: It´s Only True That Your past Life Seems to Be Veiled in a Sort of Mystery (Mařenka, Krušinova dcera, Jeník, Míchův syn z prvního manželství)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb46a1f54c98d5099879f98e78c33641fd0b3ca7d5329e924505e4c7395529f. 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/CZA168107092.
The Bartered Bride, JB 1:100, Act I, Scene 2: While a Mother´s Love Means Blessing, Painful Is a Stepmother´s Hate ... (Mařenka, Krušinova dcera, Jeník, Míchův syn z prvního manželství)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd34b376544bcdd0e37e3a719520bb856b7b0c9874b021f3a4790551a01b0d36. 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/CZA168108092.
The Bartered Bride, JB 1:100, Act I, Scene 3: As I´m Saying, My Dear Fellow ... (Krušina, sedlák, Ludmila, manželka Krušiny, Kecal, vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c87e350e351444a8b070dd90b9eb5c85da71365545aec6f81ff0e63ef3c169a. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CZA168109092.
The Bartered Bride, JB 1:100, Act I, Scene 4: Here She´s Coming! (Krušina, sedlák, Ludmila, manželka Krušiny, Mařenka, Krušinova dcera, Kecal, vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65caf285728cc4c1467e864b2af42825a7636437b0d443317e457139496793a3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA168112092.
The Bartered Bride, JB 1:100, Act II, Scene 1: Beer´s No Doubt a Gift from Heaven... (Jeník, Míchův syn z prvního manželství, Kecal, vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e2e64889e71b91dc032add3b1e8190d2c0d740ce401a0c0a3feb3ac4a8095e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CZA168118092.
The Bartered Bride, JB 1:100, Act II, Scene 1: Furiant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc33e3d02fd176a85ebed867a96ad6cfc6788d88fe2780335f4c76437f6b5f1e. 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/CZA168119092.
The Bartered Bride, JB 1:100, Act II, Scene 3: I Know a Maiden Fair Whose Love for You Is Boundless ... (Mařenka, Krušinova dcera, Vašek, syn Míchy a Háty)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd339db820b12fee7335348e01b9317e46e1ddc1d6bdac8d1a033bba0da3a8902. 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/CZA168122092.
The Bartered Bride, JB 1:100, Act II, Scene 4: Now Then, My Dear Man ... (Jeník, Míchův syn z prvního manželství, Kecal, vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0b565345e1e4126865139fc002d325c48a570230664dd4238a2525e12eedfb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CZA168124092.
The Bartered Bride, JB 1:100, Act II, Scene 6: Come Inside, People ... (Krušina, sedlák, Jeník, Míchův syn z prvního manželství, Kecal, vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fb16d2ad31af498894acced1092511f05e3db457ffb42e5c06a18c3fab70b4. 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/CZA168127092.
The Bartered Bride, JB 1:100, Act III, Scene 2: Dance of the Comedians
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372db8edb4890d26fb19a0b6ec2c5cb2f420207fe73a259c94214e569e7e47f2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA168135092.
The Bartered Bride, JB 1:100, Act III, Scene 3: We Shall Make a Graceful Little Bear of You ... (Principál komediantů, Esmeralda, komediantka)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f52e1d6ff6a7bc12a5b843a7af34ebb9c393e9a9dc185bd96925d90ca84d484. 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/CZA168137092.
The Bartered Bride, JB 1:100, Act III, Scene 8: Well, so You Are Still Here, My Young Man? (Mařenka, Krušinova dcera, Jeník, Míchův syn z prvního manželství, Kecal, vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a5ccdf85fddee948223efd8416b133a3060c7e65c0d7ef8780a96b5e4054e3. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA168145092.
The Bartered Bride, JB 1:100, Act III, Scene 9: What Have You Decided, Mařenka? (Krušina, Sedlák, Ludmila, manželka Krušiny, Mařenka, Krušinova dcera, Mícha, gruntovník, Háta, manželka Míchy,
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583f1a4eb50b06e8f878d21f7f9605aab72a4d0ac653305685986c75b96823e4. 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/CZA168147092.
The Bartered Bride, JB 1:100, Act III, Scene 10: Remember, Neighbour! (Krušina, sedlák, Ludmila, manželka Krušiny, Mařenka, Krušinova dcera, Mícha, gruntovník, Jeník, Míchův syn z prvního man
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d18b8757713c10f292894068b9d4e4c13bee015c13d2b86a10e88def8fc6437. 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/CZA168150092.
Smetana: The Bartered Bride. Highlights from the Opera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7c37d669e005d4606c0d8215e75c51bfd60ddc1d7d7c26dce79f80b8c5f80d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA168103092.
The Bartered Bride, JB 1:100, Act I, Scene 1: Let Us Rejoice, Let's Be Merry
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a554b10eb4703b79885b88a5d6be5a63828c04edde0fd4ecb3508e5ad53ae87. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CZA168104092.
The Bartered Bride, JB 1:100, Act I, Scene 5: Finale. Polka and Chorus. Come On, Girl, Let's Be Merry ...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2353ebc751e9229620da96ccb3319a0809f090c12aed8b69f6adc0e7772760e6. 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/CZA168114092.
The Bartered Bride, JB 1:100, Act II, Scene 4: Duetto. Now Then, My Dear Man ... (Jeník, Míchův syn z prvního manželství, Kecal, Vesnický dohazovač)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0b565345e1e4126865139fc002d325c48a570230664dd4238a2525e12eedfb. 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/CZA168124092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edec208525bad55c3514c82aec8177484aa122c184cdb6051c70792dbef3d9b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZA169501200.
Libuše, JB 1:102, Act II, Scene 1: Libuše´s Marriage - Water the Horses Now and Wait for Me! (Šťáhlav na Radbuze, bratr Chrudoše, Lutobor z Dobroslavského Chlumce, jejich strýc, Krasava, Luto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8f262a881e355dfa2e37db3bbc8fbdf44c1b56e966776366b611ec4fe78627. 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/CZA169508200.
Libuše, JB 1:102, Act III: Libuše´s Prophecy, Picture VI, The Royal Castle in Prague Czech People Shall Never Perish (Libuše, kněžna česká)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90840e499ed8efffa369226205cb598194357b16b83fcff4ed3395043a8d5ee2. 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/CZA169525200.
Smetana: Libuše. Festive Opera in 3 Acts
Bedrich Smetana: Prodaná Nevěsta, "The Bartered Bride" (1945), Volume 1
Bedrich Smetana: Prodaná Nevěsta, "The Bartered Bride" (1945), Volume 2
Hurník: Maryka - Málek: Sinfonia su una cantilena