Nicolaas Maria "Nick" Schilder (born 6 November 1983) is a Dutch singer-songwriter. Together with Simon Keizer, he formed a duo called Nick & Simon. Career Nick was born in Volendam, into a musical f
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 0x0d273b3347cae234aabc5152eee7a1a2ec6e6474000eb3b44ba7520976ac986f. 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/897f80d6-c6dd-47ef-adbc-1803f8456068.json and https://artists.proofprofile.net/proofs/artist/897f80d6-c6dd-47ef-adbc-1803f8456068.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 0x127510e838bfee9bcb50ede74c0ff821ce7303463eff29f9a87617b6d5928f8c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLK072200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccefc8d4bf9ae352635d3ac8aa1797c852bac12a492c68cea0587368823c6dd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLF712400539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb60a0d9048fe39a0fb5678b809a80a8216963defecf47af985c808ae8638de2. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/NLF712406446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdacbfe11b006c44a12822d077fbe3d7130be6643b65235ac9214f689a3ac169c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLF712407466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d39c2a544d172a78b5b75f32388c57572309dce4f33404d6aca329809f91d7e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLF712407468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a25bfec0ee4ac4db3f7e509afa086dd1910512ed661ec001018bdb2bcc1d02. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLF712409957.
Beste Zangers 2023 (Aflevering 8- Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f7cce6f07a029126f5bdf2c08eeaa04ba549b5da4906a101961923eff5bea0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLSU32300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee822cc6982401a735df98d58821788d391da62a45332eafa0907c2c8a2a7193. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLSU32300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0be8454f721df9e38adb7dc518b9e81e37545bea93ed5c05c0702d3a874d8a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLF712400968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e7641ea4685312700640fc42b9a138bf02860914b857e1ba7e4d052744fb95. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA241208619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f365bc742d73b0fece08428b29fa350901117e90fe3df60da84b27114522775. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLSU32300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb12489b3774bdb4cfed47bf187457b6b0ea73944245934f0a4aa11df7c11391. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLSU32300014.
Beste Zangers 2023 (Aflevering 3 - Marco Bakker)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb12489b3774bdb4cfed47bf187457b6b0ea73944245934f0a4aa11df7c11391. 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/NLSU32300014.
Beste Zangers 2023 (Aflevering 2 - Mell)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4e34f21bc3ab5b6103484a372e6886ed914e77c150d5159e126d06e3193c69. 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/NLSU32300009.
Beste Zangers 2023 (Aflevering 1 - Douwe Bob)