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 0x27890d9fe56c5bfdd865801622e97fa6cef060e53fa7f3ab11372396a1ecd26a. 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/6ff33582-5fe4-4932-863d-e3d1f202e1c5.json and https://artists.proofprofile.net/proofs/artist/6ff33582-5fe4-4932-863d-e3d1f202e1c5.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 0xe51ce27f5dfc4e02b0ab5bb94cf45f550de5bcf0aaefdd7dacce2838d474d7d9. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NLA349300267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10719b0f2db9d14f568834d1f7daedd7eb8cf6683a59f7a8f4fbbe14aeb11d9. 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/NLA349300268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb00ccd0784e26356aac93c925becaf7dc593c1f57c164a9ffe1e97a0407a19. 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/NLA349300269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e94adf6b7ed4e91bd5a957eb19129fc11be39e8fb18a02a5760e927287c7a6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NLA349300277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5fe4e30ca3406ec5c7e5a305abb8f5c8e1956182932c391c9a19df7da322a0. 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/NLA349300278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbff7fcb2bedd09f5d3d549dfa1e93f281c2c03bf57635071fde4709991a930. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/NLA349300283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b7545828acd10b068bd9c585ed25f0c0348b5d9fecfe4982e4483db3e2043a. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/NLA349300284.
De Jonge Jaren van Toontje Lager - 50 Jaar Nederpop
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1664bc5a0deb97b09b9018f587fb6a1a1f36f6de3a3dfd9733ac1b37662e35. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLAX70923227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816a7fa325fe1390290c92e0cde67ff87038bcc9a577d725d2aa89f304a06b14. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/NLAX70923240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d3ca15c3b487ec0beeb1e88d5e4bd4de637cd0a9bd486cba220214203780bb. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NLAX70923230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db9053e78cc89c615f02759a7ca04edd238067847640c087542e2d707688251. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLAX70923244.
Het Allerbeste Van Toontje Lager (Top 20)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4692da806079d2e56331ac1753096db9b8844819a2e659a674eca6bb2cabe1. 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/NLS241102641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18c03eda4327910dc3c3dfd6762c666ecefd2446a16cddfebce9753b694d101. 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/NLS241102643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9218f20a58f3a7230619d88fb48e6e178a360649f858e6121a84a502ba13f766. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/NLS241102644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfcecb0286001262b6bae9da6f9dfe695466e399dbef298be0016ca57bd6984. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NLS241102645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95a172765bc1f4d64e4d4615d9add6281ce50d859616c592234b354626a7973. 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/NLS241102646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697a5afaa436e6fb5240172b42501b2c6c45e72ab4f64ac9d17d1c6c977b7cd5. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/NLS241102647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961c8eb7f0ed8f4de379caabdbeacee04ef9e614291ee9ca18254bdc34825939. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLS241102648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78a0f2f1a23618280a5e35f64e512580917dffffc6cf1f5a939f06390f47271. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NLS241102650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb034c5e91d775dced2201e532fbed6a81acbb9aa9dc570c36684563bc0bcf74a. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/NLA349300276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62549762c5fecab0795b522da56505ebe98f4557aae2220c699336cb0f3cac39. 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/NLS241102640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb034c5e91d775dced2201e532fbed6a81acbb9aa9dc570c36684563bc0bcf74a. 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/NLA349300276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37790c9f78fcc17dd421b29a887f08d572bedacd8161dd402c12cf48cc67a559. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLAX70923226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb034c5e91d775dced2201e532fbed6a81acbb9aa9dc570c36684563bc0bcf74a. 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/NLA349300276.