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 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 0xb96fd5fbab3e837b0d28aa4ea894482620ba98fb6c09d1da82760815d8bad183. 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/ff43b2fc-d3ac-4dfd-9dd6-f6fbf2535260.json and https://artists.proofprofile.net/proofs/artist/ff43b2fc-d3ac-4dfd-9dd6-f6fbf2535260.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 0x203faf18fc4b33b27fc072e6104d0a478e047a5573b50347f3686d6aaecc385a. 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/QZNJX2418582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd39941a294f39f326ec1315c375348294b94e4a257b00f049c2533c348fc53. 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/BCA2A2400253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5e8070e085de98248d07e95ea0f5d82cc73299c9d9e5acd24ed1669f574dc2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BCA2A2400227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ef48513f6f4a673a7bb71a55003e0b9abc83b6a5866ad2e633c8a0344dba03. 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/BCA2A2400214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c232af311f717d183666da1359e3f1edd2b5d5a0ccca0e9f9b47971852920c5. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BCA2A2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffc0866e6fb885ec91d18284459beb7b340eb35a84a1caa0880e4183b5c1378. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BCA2A2401223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf054aaff4949b8b20ef29ac82d8b791e08c744ac049078b9b4edf3350c368ec7. 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/BCA2A2401224.
Vidro de Lança Versão Vaqueiro do Serrão (Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d1472ae1407d3408c5af6277a8a5353deb7d83f4fe10f58e11574a40be2d0f. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BCA2A2401036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f75164d8a996217854b145c0a572585fcf46f55a1e2f0cb87c4bd8f6e6f9028. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BCA2A2400948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a66304581d3d0465f286db4d5443b6a14087b01cde339ff61ca2110ef38f695. 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/BCA2A2400491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e4d5ccdcf3301f2aba85c3aad3111c925099245f32ac8235978723253df918. 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/GXD7V2441468.
Ontem Eu Sonhei Que Tava no Serrão (Rj) [Remix]
Ontem Eu Sonhei Que Tava no Serrão (Rj) - Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1262bf223488e66a2308f9005660a39f98a59d2cf401c28f135e123b77730d7d. 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/BCA2A2400285.
Ontem Eu Sonhei Que Tava No Serrão (Remix)
Ontem Eu Sonhei Que Tava No Serrão - Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998c7c805f4249a8ab1ab64e22cfa6d091cccf797e8e9451453c8d40bf4e0929. 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/QZWDE2413551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d02593f117200aed7ca5110be4ad61c97f686d94acfc7fcd0bd20945771b4ce. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GXBAV2230244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd965f27655235f3fda980adb055f6ba4daaed56c3055a0ec018edbcc676bd267. 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/US3DF2473959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f283d017dcc2a608abdd51ffe8dfce08815669821743eae4713b400de950773. 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/BCA2A2500143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0571b1204f2fd47b69355f783f366ca1b149263219252bd7b66f56f6dcdf9e6d. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/BCA2A2500109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0edd8fd345651b3277ffeafefe72579740e7bb1993fbe77e80265c97b7376f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BCA2A2500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232d936d91918e9616663ca26e66a3649bb0c4bd69abd0ab59e6bdf642dd83d9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BCA2A2500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8604523fd11d97b30b1ac90cf637829812f0d3aacc111abbb6d8a28dc67b2040. 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/BCA2A2500282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0254c7b3ec21df7fa5a57d740e1cebaa52d8dd80aebfcb3b0e440c9463e8bdb4. 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/QZWV32508234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7de97cd1dbe720d3fd19cd3b9794fa7448e38712130eee8fbbab3eb7ad30d0. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/BCA2A2500222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072e13ee520ff82f7c00245a320958de9a1e0080287f47b4f2ef12ac725ef37e. 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/QZWV32541559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0cfac55c20bf50495c7d4b858c169fe9e5fac33d03aa52f129ddfb6912a6b8d. 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/QZWDE2590871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c1b3f1db89438b303cf1ab1393d1246de18fe6c644a8e9be59f7ebf13ba6c1. 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/QZWDD2593840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6398b91a198f3ffbc458cb0e07fdb1ebdda5c506d117b9d70a6017272dbf333f. 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/BXTRN2500720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4079089d9c6e7360a2b4524e59eaae4f866667acf5856083935b9b4beb9b42. 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/BCA2A2100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10072ad115abab5001e72cdb3a9c665dc6fcd1bcee170051521de58fb708eb7c. 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/BKCMX2400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ea8756f4f09212c6245017a17cb24f954a8ac6f6323d3c0475e96865355a18. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BCA2A2300038.