Thomas Zwijsen is a Dutch/Belgian (Flemish) guitarist. He is known for his arrangements of Iron Maiden (and a selection of other artists') songs for classical guitar both on YouTube since 2007 and wit
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 0x7f5480abbcde73e2faa3e3118fed50af662512fbc2e95b25c2602d4f568a4329. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9002ff2b-386a-4bc1-b277-42dbe65a35e3.json and https://artists.proofprofile.net/proofs/artist/9002ff2b-386a-4bc1-b277-42dbe65a35e3.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 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 0xeca89384ecc9238379119014c2ec559e3432cebb96e78a84e2d40f0409ec6293. 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/NLWK31900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72db41ba9d29387189c5e5a0152e9d93715dfa4227f1bfeb6f8502341bce59af. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e347f00158c3605dcf830a8dd6158b2ed95d3763e20a0fa9a170d98bec6aad. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLWK31700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada22169bbb9ea7f16a31c0c1fbae3fbf055c566debfb050900f480857d9d0a4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLWK31700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be72dc8913aa4dbd63db75cdea1e4d1abc247dfd0b69e59b365476e2db0ff5e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NLWK31700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0729875ae7b3cc62644a787dd8fc8ec86a21a277d11af6eb14c378cd791e03d. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:03:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31600067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d5ed04068c5471ce8545997901daecb7c3d13f533f7f75379f953c01fe648e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLWK31600065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b043cab50a11f6f8dbb132572d4f4ee9ba927d66defaa734ace992b8320775. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLWK31400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a44f94e2eeec2f7f75fad5eb91a9865c5b6af77800ad0c940aee718a7db9cb0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0718393f73ff74e67b37cff7d89b952dc37a3b4254d8408ae50c3476cf23e9eb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLWK31200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7a7332809aec80f8d91edfc6bbe3f835fc50af40d94a933171f76b5cfc431f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLWK31200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498716e48333d329db0b2ad078f4de9a98f40d23119da3fa5754ad989b8ceb61. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf2ded7356539e648924682bc78aff2a78e0b531026f9f92de8ebdbceae7adb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9935cbd7e49264ed808540e6a5711490544bca239290417032465444264951. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLWK31200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46beaf775794ebc5ea89ee9e6bcf89b74202dcf07887f2dcabae3fcc513e58a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291357b6731814ca5a58e6e24ee47a34c4389a8a74a101774a66c9db0a3e4912. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLWK31200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2657adcf4dff739d99f32f1d7de6ab887e3e65df54aa1e3b87f27f0ff5f57500. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLWK31300015.