Zenk is a surname. Notable people with the surname include: Colleen Zenk (born 1953), American actress Hans-Joachim Zenk (born 1952), German sprinter Tom Zenk (born 1958), American professional wrest
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 0x37c54da46be3dd2908c519e532656d256a3093d111c714d668a3059b44037480. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20a6a412-9d39-4e58-b18b-455b34143df3.json and https://artists.proofprofile.net/proofs/artist/20a6a412-9d39-4e58-b18b-455b34143df3.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 0x28173a7ebbf1a18ddee748734c77141fe5d92f854a9fc247719a431b7c2a2b4d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USLZJ2290948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e78f305c420b04f872eaaf06c182e98a3daab5c79707d366e0d725dba3b05a. 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/QZ5FN2273887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc459030b812438f35e34e6235a1f355491f1fd3656956a87ecb9d812f607f7. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZPLR2077433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18919636290d8eb88f69b3521c84004aaf1b167e0b4d8d46d9cca859adf758f9. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/GBRKQ2054940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e402735c48e4e967722533cc3d9ca0ad35dabba3be5f4a8a82e3ce4863008ea. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZFYZ2059145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd573afd987b70d9f593e045445f8eb3fcaf897d0aa657679a165acc27c484f32. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYW2040228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2533b7556bc033501b5f3fdee1bd496c027afc6476905fd434548885274624b1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLZJ1983996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7109c2d35a7803297c110fca552e12ad74fce413c4cfcf3061699c16ec33c45d. 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/QZ5FN2262769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3c04d26bff5fac61ebda6a1ce7777c5622a850a9b5345411d3341a0f7fe877. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZ5FN2262774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e15c505dc4deb1e7272fd113401c41117984046f9f89d7d59f4eaa27e7525b0. 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/QZ5FN2262775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf34d4927436be1665585ba448cc905f11ffad97602eb47089280da3fa34caf6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ5FN2262776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fac6dfa7ae0edf446a1465a64f97c162afb47dc035db76212fbf50a7023c4f0. 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/QZ5FN2262780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441f6064e653ceec30afce299b0d4b971f9a1d28afdbb60f323f33bbadd6ed5e. 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/QZK6N2367855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0b64df330ac1720820b6a077d03efbef5f6a9536a0107fb6a228e86d9ed096. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZK6N2367856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf5e9b55702d51d27b077f664a9275fffebf00512af95f3b7f5b17f3e005b14. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6N2367857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211bf1e4d417b0cf5a2a5518e612074c4aca5efcf5ac0d645dffabd0bd290f91. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZK6N2367858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e51d26ec0f73d7c20d1536af0fea74107562ab704ed95b903962f67d5d336e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZK6N2367859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9db5ae5e98f6fa7098819045fa02d72293ecf5aefcd27fe4bff894965a21bf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6N2367860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad05d30e7340fa20d8372b7fc34ba804a8f0bc675baf7edd817d3d2c793987b8. 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/QZK6N2367861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d51556fe5f8eb3251742ecd867f6e4c7d292443bf69fd6093a8976fcfe2961b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6N2367862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb4ab4d2b59f39ee08bb435d5de73e6993c77be606cb42a08e29623828bbd25. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZK6N2367863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcea948a2745fd0b62a25d63ddc75d67ccb0161519900c8f3751699926947823. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZK6N2367864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5cf3253589ad6eb7c1d9ab9e993b4e9e61e2438227f242361cbcbedb251533. 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/QZFZ72395231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9e1a5b9473519368136764f3bb25f251cfd3ea3b27d86b9c86f927be9ad284. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHN52062087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdeb853b178f67ab7ad761f83b3ae51fc1f88c4fdb80680f4420b8d392a49d6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWX2121916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f5737ac6cf1f1d06e0bb8ea65868d970df48cd8f3bde63923377d8f1accc42. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZHNA2115506.