Max van Egmond (born 1 February 1936 in Semarang) is a Dutch bass and baritone singer. He has focused on oratorio and Lied and is known for singing works of Johann Sebastian Bach. He was one of the pi
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 0xd9738c092add5f41d9cb4230503c0e4b4e62b24f4ba5592ff7a167e2c1385fce. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c1a47a0-9224-46be-ae3b-c8df4c51f69e.json and https://artists.proofprofile.net/proofs/artist/3c1a47a0-9224-46be-ae3b-c8df4c51f69e.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.
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.