Willem de Waal (born 17 February 1978 in Paarl, South Africa) is a South African rugby union footballer who is currently playing for Benetton Treviso in the Pro14 competition. He plays in the position
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 0x440e92f5d0ddc8b83b4649c77dd06cbf042e1955f4d1428095ccd007d9ee473c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd9e0323-0789-4bb8-a23d-97bae9319ac1.json and https://artists.proofprofile.net/proofs/artist/dd9e0323-0789-4bb8-a23d-97bae9319ac1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Messe de Nostre Dame: Introitus. Gaudeamus omnes in domino
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 0x880c164927817a1a4acd9c7ea1aea1ca03c14d6d226d60a1afe8ab8e8604db00. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111846.
Messe de Nostre Dame: Communio. Regina mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6df0f7a16062bee003de60da4575e9bf0325d5f9491228c152399e409b82219. 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/NLY331111860.
Canto gregoriano, les tons de la musique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0132f7879599c422944362c09a89f4ac9539fbb4bac62694c7e057b7a0e1032. 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/MX2831000329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067446a7720f94e864a7f95a8db076046e259f9fcdab6d6de658124db75d0b64. 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/MX2831000342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87864ff7ded378a2d7b53f8a96a44b3ca3235f7c9e59f3ae01a0d612d8f55af2. 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/MX2831000343.
Honte, paour, doubtance (Pair of Medieval Recorders)
Dictionary of Medieval & Renaissance Instruments
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf693ce83141d0bf248aad50d1ad48ee66dafab73861a0b53ba545830a7aec008. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/MX2831000718.
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
Messe de Nostre Dame: Graduale. Propter veritatem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79cb1479c5a3abb183fa72884347b78c5cfc662248c8d884af6648c2233db15. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLY331111851.
Messe de Nostre Dame: Alleluia, assumpta est Maria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3ecb7572d53229a8aa284ead2d52b47130afec4bda295038f05091677a4ff9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111852.
Messe de Nostre Dame: Offertorium. Diffusa est gratia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cf1ee83e919731b148ef7fd37e5e3559aecb707426ce3d0bac2936d84ec7da. 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/NLY331111855.
Les escholiers de Paris (Motets, chansons et estampies)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f6275c66e6befa74594ac821574da694529635921724799ae4b5d86121eece. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/MX2831000262.
Mater Dei plena gratia - Mater virgo pia - Eius
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58545fa286bd0b0fa7dd927cc87d4e04a2c4f8c62a902256d820323587e849c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31c19d049401789aa2d470009dab3cb41ef12189604bf84b07cc8c84ac34874. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/MX2831000278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc668ad68495f42568c0dadc359a9aee4dccd856da1c9cb8bdf78f560eabf1191. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/MX2831000284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bce2669aa1a58f68022e3ea77e3683d0e44ee339a34c3208aaef6bc5f761128. 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/MX2831000322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87d23ab0bdb8f10694eb3c14551b43707c1ffe1f5a2e0106916621ebdc3e637. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/MX2831000336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815577a55492b50806a304a4677af31a5be30b1c293fdba1de657edadaeae890. 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/MX2831000344.