Hej Matematik (literally "Hi Mathematics") is a Danish pop group, consisting of Søren Rasted and his nephew Nicolaj Rasted. In live shows, they are accompanied by Nikolaj Teinvig on guitar, Nicholas F
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 0x255e5677a2baf415af01d74e27ccb9a1094175c7cf8e15dbb459ee3dd7bb7f91. 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/95f2db29-1113-49e2-b3d4-1496dd2455ad.json and https://artists.proofprofile.net/proofs/artist/95f2db29-1113-49e2-b3d4-1496dd2455ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sjus (feat. Ida Corr, Camille Jones & Johnson) - KATO Edit
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 0x77876ff508b7d940327f19f34019ee73607b1d7e33d0fa02d8ca238f1f7a6e13. 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/DK4YA1102302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9b02a5132c172bc994b3c3a27a8320e89624f22cbf1cdcef9777ff8f313009. 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/DK4YA1102303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73832b85e2a950ac51125d94493033116e9b0d93531f6170eafbc65b8c0ebd33. 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/DK4YA1102305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e05cc94a06b308e7fc5ea0b386d38f261e726376931a35a6ce1a930a78bcbb5. 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/DK4YA1102307.
Hey Shorty (Yeah Yeah Part II) (feat. U$O & Johnson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fe9d8b0f49c0c97808737360911cffbbbe0c79c6c255a76d25bb087a69f5b9. 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/DK4YA1102308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609f3894e9b3c09f310cc23aafe21322594e2d43f8a09e36cbe12dd5b43aeb0b. 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/DK4YA1102312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52563605c3d8b8a6e63300f03d0f99c82d296154ddd44bb6d2da4e43fdd0e94f. 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/DK92A1101402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a1b0be1ef5688c6c350f567b9b71baab516a7069343192a43b73822b5bc390. 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/DK92A1101403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c0cc70b627537029d71ddef23909e70fc4be0e5c56ee9401cea922353724c4. 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/DK92A1101405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba18e1f492dddb704292a7a7dbb24b5340524f8cd5d65987e60d5585a468f3cd. 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/DK92A1101409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5be5baee7f06a07823d13ed49dbc84336268ce0622a3ec0275327e4995908f. 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/DK92A1101410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf045caa847d943355c1b08f4396926fe76abf44d3ef08f31890e22d6c0ca0955. 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/DK92A1101411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1af05ca43a9a14befc5046b845b0d535824475b9b4d3063bdd2792412913661. 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/DK92A1101413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962efae315d9f7b0462fa220bb645dfefd09abf10f6e439bc466f2b44d95934b. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DKBR70800107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeec6b4d3162cade8d2c708082460d398784976b47976d7cc54275f06dab398b. 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/DKBR70800112.
Ik Ordinær (feat. Jesper Binzer) [Kongsted Remix]