Den Sorte Skole (English: "The Black School") is a Copenhagen-based DJ, producer, and composer collective, known for creating music using diverse samples. They were formed in 2004 by Simon Dokkedal, M
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 0x23e2bac8d444529fa808ce772410b0f832d7b1198e6c463412fce00b811e7ff8. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e82c185e-a70b-4165-a103-bc3dbd8d2c39.json and https://artists.proofprofile.net/proofs/artist/e82c185e-a70b-4165-a103-bc3dbd8d2c39.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 0x8e1b7cab409a6eef85f2cc746524b9c72fccf68586ad746fecb00e95e6652e29. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DK7D71300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38833891b0f298fa08655edfb4a4afea185567a25b4993ce263091589d0f1680. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:03:57Z), 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/DK7D71300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94c68fd57032f2160d1ece59360770d13b84fa19fdfb9ae591ea5d32644b387. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DK7D71300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b2b60a9b48c89504d062f7ae4ef63011fd125fc8b27f456b82e33188e4783c. 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/DK7D71300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081b6e82d0212884828b10ed19c0a59933488cce8dcd18b2e9b9abc997a4f06a. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DK7D71300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797161af570f3704dc10f0580aa3c262d65b693cddd679b93208d6cfa2068781. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DK7D71300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56664c6f5eb5092e19e77c3321f91ec7faa695fb83eb44c48c239fea0fad16ec. 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/DK7D71300108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566a2b7328e311844ce4e008ea4c860384a29dc79d7feb8dc68221b217ad98d3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DK7D71300109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac1e6ffd25cbc54ccb37dda16c548ac1d0623fab6719ff9a04d00f043e9103a. 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/DK7D71300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1be31b698b9899c3cd58f6b5f61cf9256d1a5ae45cacc849a23695276773e6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DK7D71500202.
Symphony No.II for Sampler and Chamber Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a966f6912c07162f50bd650e3842bfa025673c88082ce28de308e7faf6aa3e1. 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/DK7D71800104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9cb88fd0989b90c03fefcd3d1a7bed7edc9222f093e829b4257443e3b744c6. 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/QM6N22514105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa401c982cc3372de80646fb04a5ec7059cba1e6d8ffe65677364107a2a9d3a2e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QM6N22514107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf865b25d1f71148fe888c73a720c4a6aa237839b84ccc4990136685d2987381a. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QM6N22514108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe768f90735df9ced56348d55330818b26c19909b225e8ae879e3d641c8e8c4ff. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:24:32Z), 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/QM6N22514109.