Luuk may refer to: Places: Luuk, Sulu, 4th class municipality in the province of Sulu, Philippines Liège, City in Belgium, known in Limburgish as Luuk People: Kristian Luuk (born 1966), Swedish come
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 0x761d797101288b2f24a59f070b83cfb815eab94f7e161335dee383cc2bd644fd. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/797bb05e-3d10-4451-a58a-b280fca0fbaa.json and https://artists.proofprofile.net/proofs/artist/797bb05e-3d10-4451-a58a-b280fca0fbaa.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 0x364a4937995ea07b32f26b6af39b4dc434b407979718d6c453fe549946ff5454. 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/FR26V2018530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b0772afd0fe5b28cac567d04acee09a5c9c9144ebbe3b4209f203c498b104e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH5261500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89aae467328693b1101737b0121b1ed18a8019926077a46905fd02863f9808c. 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/CH5261500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd87c3324e25fa711138d9100b6325c046722f2bdae78f5c36c7a5be0d7695d. 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/CH7811300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42920a66987199ad7275b4f71664fb0e9eb8c73162e4db154204209b9c8d5191. 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/FRX452048328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8bbb82ac1b1a7cf6885fc7d2e9987308211c1d086c1ef82acd5fe6d59583f6. 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/CH0012200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551b86fcc1dadd99d944c0a9fd397d857aed7958cd91d59e99ba64a614623578. 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/CH7811707834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82386d6802faea032e6798bb5debc17999911197da7875a250421c6c5992876e. 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/CH7811707836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52823ec0d30e9bd11ccca0fff8666b16c5a54db38b562e34a9da104e1344577. 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/CH0012400087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ebf38429a8976701ff64588e657af6505b3e52ff997922fd5a85035d5e1f4a. 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/CH9961800509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177d9c7500c0919892ace9a06419aefbcba68b02e77878ec7dfd4b02b133ba2e. 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/DGA052376544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42920a66987199ad7275b4f71664fb0e9eb8c73162e4db154204209b9c8d5191. 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/FRX452048328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0024fdd2e12219b6caaa35eaab3b963e40d9847a4e71f7f3e2185e1b6379d7. 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/FR96X1964975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cb9724698991e111e11872b370dfdbd8a50cbe4ca8fa27ee3ae94e87f6aca7. 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/FR96X1964979.