Robert van Dijk (born 15 January 1969) is a Dutch retired footballer who played as a goalkeeper. Over the course of exactly 20 seasons as a professional, he appeared in 364 Eredivisie games, mainly w
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 0xf2728a5b9ff7392eb9deed378d448e8ae28ba5a85f774c04020e24fbae6688c2. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1aca762-7996-4af5-a19f-49f8c9c9c845.json and https://artists.proofprofile.net/proofs/artist/f1aca762-7996-4af5-a19f-49f8c9c9c845.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x370d1f47872db58b77a6befdfbba26e78012faca565b67ec6537850431ee0e5b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T05:06:27Z), 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/NLA241803073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8ddfa971b7d3f1ec94a2adac8530fc272090e8613869dc2d7d6712a123a8c2. 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/NLG620572639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc63f661203af1a097e321029ec43b52c4eaeeaad2b2aa47105fd47ea454830f. 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/NLG620572642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8bb17bd3db2ee29ae99f98de66b8c991f9f521b5657db52a5e1f81b3d8d913. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLG620572636.
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 0x295d5100ac262f65773f64ba12e74db367609ffccfb539edc08ea7e2fa3cdcac. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLG620572638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5417fa933a8cc782dc805ff0f8c82604c7f75cf3b8c24dfbb5b8d5ec115f8a32. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG620572641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c6c77a57a1269bab29d78264783759a7a0dab0bc0caaa1c5e3778b609346de. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG620572643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf178476493e1d30eecf3650cbd2fc47ac793f7467e07fb27419f7ef6363d7bd6. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG620572645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc167c6b1849c6af566998befa6555813c229e86c899e31dda8a621f9d14dddc9. 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/NLG620572646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071b3ffe85025ba4c366120b184d9708e7f5c75b3a06789f4ba2dfcf7a627bce. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLG620572648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd8343e1af1d1775f08c87c25d5a4da2d7112b277b44df82fd4b66c258ce99e. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG620572649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf06fc1c4191d794f7f930d43744bd49ac464517747394a7f3037003e3e0048. 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/NLG620572653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc2f1d4f7f128bfc817e31e8413fcfe210833fae2a2d7f8ece43aab250b7541. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLG620572655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771599868b6291568c7a050e37d4d91074c8483afe83e0f244a4b272232a5b57. 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/NLG620572656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83fd4f3fb375022a195cb66b71c2f2ca448471314b1a2f3ec9d122ed3a894c1. 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/NLG620572661.