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 0xdf9b022bb13f1254cd501a20ea5706ac4e87f533d3ebc42318f818f239c7fb98. 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/c9d15bec-738d-43f6-8aea-ece28c6c0491.json and https://artists.proofprofile.net/proofs/artist/c9d15bec-738d-43f6-8aea-ece28c6c0491.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 0x502e8d5137c559f63ced661b83f138252514ac3515f42e8281c1c842038ba86f. 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/QZ4JJ1669674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933a8aba5e75ffb5e9688c6755a2e4ea58dcc7ae5029d1ef8908960161cbd5be. 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/QZ4JJ1669675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbe4019907af65dfa7da7cba9d96f2753ce47b03d2af01c2bebb19512c04955. 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/NLS241601979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8bc17fac52a080f5659811ca319414b1c778c06755d44cceaabfd2331f1544. 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/NLS241601980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cadf0d2e0770f629e0720f1fff6ca75c3280cfedb69909aeeed07f3ea1b1cf8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLS241200924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268882e7130f9de6dea220391426bafeb0c58431ea68d4f79043c13dc3efa0c8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLS241200923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e1bc88a2e8a1da8630e2058e6b35ca2f587878a5a8dfbb9bfdd08135f836bd. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NLS241200917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e2acf90a82b12b233c08a3feabdb1d0f99c213a55307c7e9d4c5d569cdda47. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLS241200909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2714c353bc5da788743568066aa96e575b66ea8acb4a621d18178adb97d332ce. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLS241602039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc2765b8ae77081f68de34743cd603a3daef7d130b9779cd124f91c44e70446. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLS241200925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ea78270ac976d10dad14017889d79af6bb3615a907e52df2aa9f9e557016b0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NLS241200926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e5bf43744dc6ca90380db8e2143de3892eb0c2cce2f094c60d494022107114. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/NLS241200915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f04d3bc1819975c29439795709149a45125edc072836324568e544d06e2b03. 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/QZ9JZ1741672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107c0364e204c79666aba3d30a83e77fe233ea34bb134296bed4eaba39011b79. 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/NLS242100280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d89874f36a2e41292c585a9e3567e9aacd2773f6f404f76e33de512e897784. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/NLF711302834.
Feestknallers Top 50 (Grootste Party & Feesthits Aller Tijden)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbe4019907af65dfa7da7cba9d96f2753ce47b03d2af01c2bebb19512c04955. 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/NLS241601979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845e2af175dfead20968e15a87daefa36e8633848d072af78700f550184d2b9b. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/NLCY30802235.