The Underdog Project is a German dance group which launched its first album, It Doesn't Matter in 2001. Their hits include "Saturday" (not to be confused with "Saturday Night"; this was not released u
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 0xe3d2c2543e1e4fb87b9c30d29c4a2da8ba198b97a23efebdc59ae662e1297eb8. 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/04f5db46-c963-4f05-849a-2554fe46d536.json and https://artists.proofprofile.net/proofs/artist/04f5db46-c963-4f05-849a-2554fe46d536.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 0x9b50b31274947f91f374aeec6694923ca26cd15ec6460300436ea571782e3169. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEN060000112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d9ace65366a86e3448145034d210563e4c5c74c2bbe7b17afafbaecc7f51b7. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/DEN060000214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab84dc459b7d978d204f0b976c9a486966b8390b5f9d4c95c60e77552bb690f6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEN060000210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b8d43d1ad4e14a56b647207e9b37495c1e4b1ad72f7a695b41a18d8fed9421. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEN060000253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2479133b090beda5d2298e3c0578b66310bc83562dcf68bd66ea713f0e7012c5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEN060900308.
Summer Jam 2003 - DJ Hardwell Bubbling Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7e309051eb376e51095e6793a6509fdec9ad5464ff4bf211a52c8fda2ec52b. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/DEN060300866.
Summer Jam 2003 - Klubbheads Handz up Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7f0efce22915d0e4a91562e71d9e6a1061a0f62fff664b334bd06fee124cae. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/DEN060300887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7040430e1af22bd1234a5973804e8ceaaac17183ff5661643cc916a3555cbdb8. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/DEN060000227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419523dddc168a90d809a97c92050a50977eb630dc6b076598b8bb4e275b3de9. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/DEN060000235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22b8869986f645a9e67b03fbf72415cdead155fa6c2eb5d660bc2b155f138bf. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DEN060200467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aea8ebf28f2c32c87fe490ac51360b279a1e017698ff3944ace8d54a286377a. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/DEN060200470.
It Doesn't Matter (Greatest Hits Vol. 1)
It Doesn't Matter (Greatest Hits Volume 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98358e5aef52683736d4e683f65de2eebbbad1dc4c72b779b57f4ee6f76ace1b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/DEA620700146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78bb38e9f5095bc32e1f48b4465c1a08b698bc555fc79813778c5fa777aa673. 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/DEN061003315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8537849f7ff894315cd3100f73cc6e3fb7f586fd264df55e9faf68cdf6d57271. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/DEN061003593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbb7c9eef1c8d5b54d755ed032b5328a78f20f0344b75ecfacf431c85d7783f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/DEN061401254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd3bc9c82e56306fa3969fd13c1eb42da6251d408bcb313b17e469d0951802d. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/DEN061401229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc566d5dd73aba4bfc979f1d1d8502f3164003f59d4171a467e6c17c0b96cf0f. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DEN061500967.
Summer Jam (Blondee & Roberto Mozza Remix)
Summer Jam - Blondee & Roberto Mozza Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f42bc12bbc428d23f8ff133e6f0fdbaa0b5a9ddc9622d253ee9ef0977d4112. 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/DEN061600628.
Summer Jam - Blondee & Roberto Mozza Remix Extended
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3da17901bacdc42bad05907ee62890fd40b780ccb78bb0f6d2562ca7f08ae78. 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/DEN061600629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e53946decfa7eff15a31dcda62859a41937326291df9c7ea8d23532d3443755. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/DEN062003902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7ef8b887161db67cb9d10a8084d8524136adfa4840754aba8c683c9f1a40b8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEN062400293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c55d04bf10ce8214f4717b0d09f5274f06e5420417675b7500397ec6a5eb9e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEN062400493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f746a8df2bbf9cdc45df16a6d594b991052788e3d2ec81a829e47884b8c461b. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/DEN062500231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f746a8df2bbf9cdc45df16a6d594b991052788e3d2ec81a829e47884b8c461b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/DEN062500231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f746a8df2bbf9cdc45df16a6d594b991052788e3d2ec81a829e47884b8c461b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEN062500231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56e2c5323be6f428da0cb339dfdf89af42fac3c15173eee1174d243dda65900. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/DEN062004522.
Kontor Top Of The Clubs – Best Of 2021 Mix x Best Of 25 Years Kontor Records Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e42cd6afb867a84fdee8d4afd1a0ec30e68abbdf31e86f716c3d0929fa08132. 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/DEN062101287.
Bass, Beats & Melody - Underdog Project B-Boy Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2533aeabe30473841c008efe5dc8736ba802d99f46814a4264d0b19576ccca6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEE860001015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee1dbb3d3f805be0979de7c947133c64b5439dd335205984a3436e040cc1263. 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/DEN060000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d12b853c88a4267bd03d93d9aa90889e20dc3fcd71806c969911505cb34a552. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEN062004079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e53946decfa7eff15a31dcda62859a41937326291df9c7ea8d23532d3443755. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEN062003902.
Kontor Top of the Clubs - The Biggest Hits of the Year MMXX Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123c8a5b239c829d41697613e272f37c79e8c823e14c3ade257aa7f06887f475. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEN062004729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343d00b5e589ad72ae90ccdf3685d8c04443a5d0309a10660da107fe6447adff. 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/QM4TW1601447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d06698256025cd0d5abf78fb7f82cab6dd0015adaada9a7864c178314d03e7. 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/DEN062004135.
Kontor Sports - Nonstop Powermix, 2020.09
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054a6b4733176523e20d7ae0844b61c51041efd4a81d2935b3ec698e85b430cc. 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/DEN062004392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123ce7185fabd217660ab6f56fead1021a6c7fcfbe169d07683e9f1d40276ca8. 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/DECE72501360.