thumb|Zjef Vanuytsel Jozef Guillaume Dymphna "Zjef" Vanuytsel (July 6, 1945 – December 30, 2015) was a Belgian folk music/kleinkunst singer and guitarist. He is seen as one of the Big Three of Flemish
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 0xbd3ec0fd2178b820d19d92a4ae11fa7a0f567e38f6349b1e1ba48a6e3cf24f76. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82e7f48b-8af1-4832-8224-0e0e1070bf75.json and https://artists.proofprofile.net/proofs/artist/82e7f48b-8af1-4832-8224-0e0e1070bf75.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 0xf80345796584c1bc474819652277a25511ab398d7872fed9a5a81138b656a2ab. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/BEQ027000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb057d3bceef45c7be39cb41443739923590b9a16fbeb5d3d4cf94b7e4b467cd7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BEQ027000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de758eb72f953af72d5cbfce890e29653d00a011354f331d95c04a35a6e87c5. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/BEQ027000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea000f4f48cf99d51f27b9dd76ae0be277a143adf1601b6db121210768865d9e. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/BEQ027000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a467f04d26886f349112536ddf4b5592e6084c5aafaad30a02cf6e8d8afbc81. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:20:28Z), 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/BEQ027300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cc519f862fdfe03270dbcd2a7d6aa95b11793c0e613a50919ebba5abc0b416. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/BEQ027300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6c56407ddf659511a6e72c1184aa4eff1cca354f84617e19c0a148eba03481. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BEQ027800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9e8e9f096d69eadf73b551da986f77011171172e9ebf587e8e6d08981b1d37. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-19T22:45:17Z), 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/BEQ027000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620623655b3ad7cb4b3af5f5e28701405315343b29eadd7c9b7805c2092ea6dd. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:00:38Z), 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/BEQ027000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2e1cc73dca7be12d8cb5f035d0750d6d651890d210e18e3b1bd95eda15747b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/BEQ027300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd968d422a02303e1b109fcf80ca45ebb474bce3989293295301bd3ee07c80966. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:40:28Z), 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/BEQ027300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea000f4f48cf99d51f27b9dd76ae0be277a143adf1601b6db121210768865d9e. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:41:48Z), 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/BEQ027000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538e2a421e0396d361fc582cdc3b61c699812afa012527718ae01f16c0e4bfce. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:00:53Z), 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/BEQ027800004.