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 0x15b0d1eef97ba148150468e8103485f637b400752a9e6ebb2da582ff3a920669. 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/b70a0d83-fee6-408a-be06-0a07daa0a635.json and https://artists.proofprofile.net/proofs/artist/b70a0d83-fee6-408a-be06-0a07daa0a635.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schmidtchen Schleicher (Expanded Edition)
Unter Dem Schottenrock Ist Gar Nichts - Remastered
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 0x00c024dcf9ef0a1f51d98804bff5ae30d97b3050ce56afcaffc4cc4994bef2f6. 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/NLUM71500270.
Haak Gevraagd... Feest Geslaagd!!! (Remastered / Expanded Edition)
Haak Is De Naam (Remastered / Expanded Edition)
Quick Quick Haak, 28 Nederlands Gezongen Evergreens (Expanded Edition)
Bulletje En Bonestaak - Remastered / Bonus Track
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b7f50a42fd5407b0154b335f4dd2bdf7a36e711418fbfb5c1cc805f665bc5a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLUM72100466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2e9bbac102534488b691eef4ea1e412ab119db1e6b5fb327573b8f2ed83e9d. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/NLC288700065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b109673bd043eb4bd2d1d24772a209138e30981bc984df428bca4d49dd15e8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NLC289200121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1aa6e43caf159fdf4f340d36edf9e7638670e28d33a3bbfb891ed0899195d7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NLC288700067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4492074b41190304a4fd26c0b0c1b6fe41aa66169d8e0da29cc416775d8910. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/NLC289000209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb5a6ee953b1e3a03f18046a819b6a834137fbbc6fc0cb2ebefdd011b42ab36. 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/NLHR51023409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bfe5ac3637c02bfcea5a938e89096d10e211c3f663c207b15928d361eec94f2. 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/NLHR51023413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db0af57f2f5a1f91486b8173b0d84b607139d685b7e7b5bea72920dd4224279. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NLHR51023421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfea1d8c9e85c7759f1b222e9b6b7a6e1767a28f429cb23331b2d07a7537c29. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NLA307300044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99e461b708e1f0892148c8273585f2125acb26fa5488d421b2a6ab82a6a6502. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/NLA307400011.
Unter dem Schottenrock ist gar nichts - Remastered 2020
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c024dcf9ef0a1f51d98804bff5ae30d97b3050ce56afcaffc4cc4994bef2f6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLUM71500270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77ae4a3864479cc14d4d280d588b38bd0cd77ba2f4463e7cc31da971635c194. 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/NLA307500152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77ae4a3864479cc14d4d280d588b38bd0cd77ba2f4463e7cc31da971635c194. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLA307500152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2e9bbac102534488b691eef4ea1e412ab119db1e6b5fb327573b8f2ed83e9d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLC288700065.