Cristina Deutekom (28 August 1931 – 7 August 2014) was a Dutch operatic dramatic coloratura soprano. She sang with many of the leading tenors of her time, including Carlo Bergonzi, José Carreras, Fra
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 0x12846675d341aa888043a85f8e87ffa01f9523d44ce2b64ef6a0d7fe3c46da91. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a13b27e-ef6f-4ddf-b5a7-c0fc28b7d434.json and https://artists.proofprofile.net/proofs/artist/5a13b27e-ef6f-4ddf-b5a7-c0fc28b7d434.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
I vespri siciliani / Act 5: "Mercè, dilette amiche"
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 0x1e320451230b3fa637aa03539937ad239e8ebb711579b0bce6333f28c55f37a9. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLA506900614 — a six-check JSON result.
Ernani / Part 1: Ernani! Ernani, involami
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe839a63006d93ed81a7650340e089cee1e3a2b159e42672e26f14dbb62a6d177. 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/NLA506900615 — a six-check JSON result.
La traviata - original version - Act 1: "E strano!" - "Ah, fors'è lui" - "Sempre libera"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5e81f44162c2f6b88211016aa7787b103fc4d6b07162ed8814ada575cd036f. 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/NLA507000355 — a six-check JSON result.
I Puritani - Act 1: "Son vergin vezzosa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97424e26c0f17cd96224562eb892d9b55f3646145af7e7fd4f7e8b415aa8fbdd. 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/NLA507000357 — a six-check JSON result.
Lippizaner Kaiserin - After "Der Vogelhändler"/Arr. by Walter Kalischnig Janne Furch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe004cbf453b7fa54f6d4de5db702e6bc175864b69e07a2d2488f879727fe2597. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507100385 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf0eb06b47013498070595db85e3ab8cf5241bb9b72afe743f238416ec76283. 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/NLUM71300105 — a six-check JSON result.
Attila / Prologue: "Santo di patria indefinito amor!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e46796fd12c7f93ab88a2de8a05b5c5177e966aaef601c7b82be6bcf7dfe48. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLA507200798 — a six-check JSON result.
Attila / Prologue: "Allor che i forti corrono"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378cb3899295f51c696bdcc847836650cb7d4d5f319652e377f8badd7c8d64ad. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507200799 — a six-check JSON result.
Attila / Prologue: "Da te questo or m'è concesso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b44a83b45916dc52c6e26d7283b76b7e4559a070e92cf417190f5c944a7e4e. 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/NLA507200800 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b45bb5bd168a698df0c401f1dc7f279552b159e385b0b916d412bca1ab9e2fb. 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/NLA507200810 — a six-check JSON result.
Attila / Act 1: "Oh! nel fuggente nuvolo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef38e0f8439e7849b47c477d699fbc7f380b215d208bf4ac5f3d0c87203e25fb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507200811 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce600aeed860191ca31223c171a4b9d52e4ae9d17db43557da59a063827394a1. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NLA507200812 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6361266244f38782602afa5f28ec647935d10705475e84800120c2f96a693669. 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/NLA507200813 — a six-check JSON result.
Attila / Act 1: "Va! Racconta al sacrilego"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a174a32dc3335fddfe7f5f1838381c0629a6a17e680bde96e5b9d3c1a50d80. 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/NLA507200814 — a six-check JSON result.
Attila / Act 1: "Oh, t'inebria nell'amplesso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17afa3ed45de8a894395b055bad9fd88f4c06b673de586724c85d476639f5d0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLA507200815 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e578052e27cff5728214cabbc86d81b7f2c8f4480edfdc7e06bfc2aafd13b4. 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/NLA507200820 — a six-check JSON result.