Buurman may refer to: TV shows Buurman en Buurman, a Dutch version of the Czech TV show Pat & Mat. People Atse Buurman (born 1982), Dutch cricketer Eva Buurman (born 1994), Dutch cyclist Yelmer Buur
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 0x9c32b15ecd997f5b71348c8cbc5f171867dcfa174e9bcc48f6c0b761bc72502e. 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/c7b95edb-eeca-4d91-91ef-1211f9a6a53f.json and https://artists.proofprofile.net/proofs/artist/c7b95edb-eeca-4d91-91ef-1211f9a6a53f.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 0x6feaa5338c9caba86ae15bf5d87fbeeb4c663f183b2a75af50e0d751a6b30c1c. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/BEUM71002752.
Ik Kan Er Niks Aan Doen Maar Ik Krijg Jou Voorlopig Niet Uit Mijn Hoofd Gewist
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d96e7fcc7e85671bf0f9de9f92f7d32d6fa5823bbebeffcb5a6a4f5fb4f020. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BEUM71400378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a9a42d6ae823f42b1e9205a63eafe92c1ca23aa3a7698d4661445180e6886b. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:31:18Z), 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/BEN581700397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14acd8d2bad7321c2d88efce4f533107d19efed200c42b6943524c5562e05b71. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/BEF471900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a37dacba080a70637b43d814d0c370af89978e04aac3328212d747957e7643. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BEF471900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdf2b7e159eca1d5dc2bc348848736136850ef34f815835faaa5e0baa975a5f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BEF472200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3506b31f2953c378e56143de539405c28815a613c42ca6ba6d6c91b80d05e45c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BEN582200245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a86cdf6a24e5e7e37f2825a926844092640a6de5b35506c6ffc8c2c912d78dc. 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/BEI261800002.