Claudia Eder (born 7 February 1948) is a German mezzo-soprano in opera and concert, and an academic at the Hochschule für Musik Mainz. Career Eder was born in Augsburg on 7 February 1948. She studi
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 0x19c074ff37608dae8dadf6398db4b1629d20f64768841aabbbf99d37aba38470. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db03a629-32a4-4acf-b92c-49a237c711a1.json and https://artists.proofprofile.net/proofs/artist/db03a629-32a4-4acf-b92c-49a237c711a1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Les Contes d'Hoffmann / Act 1: "Vive Dieu! mes amis, la belle créature!"
Jacques Offenbach: The Tales of 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 0x9a7d3bfd50472848c043a3a971a5914f2c7a2e3fa2e34c0aa74cca0c43515c3d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631224 — a six-check JSON result.
Les Contes d'Hoffmann / Act 1: "Peuh! cette bière est détestable!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17729885e48c18596935a23de2b2549b478023daf5784897c4e72a94112641b8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631225 — a six-check JSON result.
Les Contes d'Hoffmann / Act 1: Simple échange de politesses!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5998f6e1d63f935b2e122cdf4afb63099ae9effc7a0115372d41be2a1aa9b3b3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEF058631232 — a six-check JSON result.
Les Contes d'Hoffmann / Act 1: Ha! ha! ha! Monsieur aime donc quelquefois?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639f691fe3617ba9b734d3b5b6699082b97df905cf36b240a9c1b112ae17e3bc. Chain 2 (Bitcoin): anchored in block 957034 (2026-07-07T11:52:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631233 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "Allons! courage et confiance!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e2feca313ec2f71607f45200edb6fbba43401fa9f2d97ff61568318604f4f5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEF058631235 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: Voyez - la sous son éventail
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb21041962f88b585e9d6ce0f25a9959165a1877a4e0feca3f4a718fa5f3e088. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEF058631208 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "C'est moi, Coppélius"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a974dae6ec1f406ea3db95c88f02b93117536cb3d34417bf8385d7053eab5c. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEF058631236 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "Je me nomme Coppélius"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0d2b23737fcb4ea09960e5b9337b767aadeb03a9615a44f33bf42b1118ed6f. 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/DEF058631227 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "Non, aucun hôte vraiment"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84374f8326a3e717d91aafa28a1e6b806d58929b453874264d98f7eb72993d58. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631254 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "Ah! mon ami, quel accent!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ad23e40f4eb8d7d29979885b0654fd30cfd556b9486981feb128f8e0bef7a3. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEF058631238 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "Tu me fuis?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41445657e8118df38bb9547ae62246d3815a549fb44cffa0bd18da868731c3e4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631239 — a six-check JSON result.
Les Contes d'Hoffmann / Act 2: "Voici les valseurs!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bce4fe325d83ff245d3fec0ab7c4a37ec979187f203c9b9e6d6d07c4f09e4b9. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DEF058631213 — a six-check JSON result.
Les Contes d'Hoffmann / Act 3: "Mon enfant! Ma fille!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030899fc3d8bae5c65c396a0a15978027854ac40b5cec1c056a0f8eac32eff0d. 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/DEF058631245 — a six-check JSON result.
Les Contes d'Hoffmann / Act 4: "Belle nuit, ô nuit d'amour"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa003f46a808a3985569568e44f25cbb26686d09771635ebbae7cfc943ffa2a4f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631219 — a six-check JSON result.
Les Contes d'Hoffmann / Act 4: Je vois qu'on est en fête
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b115a607151eed4bfeae309449c42c71a94a55105fd08cd83f55bfc4b7f8180. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631247 — a six-check JSON result.
Les Contes d'Hoffmann / Act 4: Schlémil!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea6b0ce51876d42be04c6f1c85fc6124f194ed637b3f6fb56e7f5646e560bdc. 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/DEF058631249 — a six-check JSON result.
Les Contes d'Hoffmann / Act 4: Hélas, mon coeur s'égare encore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a6c77445f775fbd23e93149aa02d326e32efcd7bc85a9584ae2001ff3e9d45. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/DEF058631250 — a six-check JSON result.
Les Contes d'Hoffmann / Epilogue: Voilà quelle fut l'histoire de mes amours
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9786d2cdd0be9b67cae1acb738e944ce49c189cf66666312b5fa7c2f375f82. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631251 — a six-check JSON result.
Les Contes d'Hoffmann / Epilogue: Luther est un brave homme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeddfaa43bf4a6305d90d095a8b0560585fd56397d172259fa800e59131ed16d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058631252 — a six-check JSON result.