Ulrik Thestrup Cold (15 May 1939 — 13 October 2010) was a Danish operatic bass. In 1963 he made his professional opera debut at the Copenhagen Student Opera as Seneca in Claudio Monteverdi's L'incoron
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda23f9b8180e882148043cde2c83a6b049bc88bca68f517738a472b6cff2678c. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ad5b9e8-4631-4eea-96cf-6330826a342c.json and https://artists.proofprofile.net/proofs/artist/7ad5b9e8-4631-4eea-96cf-6330826a342c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Handel: Admeto, HWV 22, Act 1: Introduction
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6384d4377f77144ac5b7b423c1ee93b0dba30fdea6a26eaab89d11557883ac. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEC629501016.
Handel: Admeto, HWV 22, Act 1: Recitativo. "Orride larve" - Aria. "Chiudetevi, miei lumi" (Admeto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd1b2d0fca00e5488e765cdbe876c036e0a2b58ad6c15f467962f247c4fd14f. 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/DEC629501017.
Handel: Admeto, HWV 22, Act 1: Aria. "Spera si, mio caro bene" (Alceste)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a7ec017b5b2fff5d5dfe8f05da253cea52d932ceba44e6e4bfd3ddd9d014c8. 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/DEC629501029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1659d2c93fe511ed0a5a5e07b92d0c2654ad353d2373844c2b53e53c355ae028. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEC629501015.
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
Handel: Admeto, HWV 22, Act 1: Aria. "La gloria sola, che ogn'or bramai" (Ercole)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b47da6c5cc86dde01285abf07458fc44b53559b54f5b39b61e9624e91c5cd9. 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/DEC629501020.
Handel: Admeto, HWV 22, Act 1: Aria. "Luci care, addio, posate!" (Alceste)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b542d0617f4c22bbb0238f9efd5fa15c4d3991d792ffd44ed5cc54f27f88e1. 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/DEC629501024.
Handel: Admeto, HWV 22, Act 1: Sinfonia pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f9270e16ec5dc02fc454d03eb56174058f430418488f6c9edc374035d49707. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEC629501025.
Handel: Admeto, HWV 22, Act 1: Aria. "Spera allor, che in mar turbato" (Antigona)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9570c4aa8b8e9e09e5f0c3030e28e60fb38cb1ba053451f43957b34576a33e67. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC629501027.
Handel: Admeto, HWV 22, Act 1: Aria. "Cangio d'aspetto il crudo fato" (Admeto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6294f4dec196f3d16939091dc27e4a65f66ca4cb267dca3f0bfe3386498fb77d. 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/DEC629501030.