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 0x56bb16f6fc6c62865da32440b3dfd74ed115f7639b116264e2a3682f87bab8ac. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce8fdf05-81ac-4cc8-8e12-efe9d873eaab.json and https://artists.proofprofile.net/proofs/artist/ce8fdf05-81ac-4cc8-8e12-efe9d873eaab.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 0x2cd37fac1d9ac7567b2f1f579362b3dc45d6e7d127776c077ded991a4679dfe3. 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/NL7DA2400440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44785950e5c7114f9b3c8f68ffbdfd7c9923fd284f89e05da13e24b069424874. 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/NL7DA2400441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e24187aaa06dbb1451459ee071bcd12443dc1a9ca3a1579060f0a30d642177. 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/NL7DA2400442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb55d4ae5d9dc601ea879cae725beadf95fc5641573bda9b9edd093bd939135. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NL7DA2400443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109e965c755c4264960643737a1b863d36120161c457b41382568ff42e6bc7ca. 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/NL7DA2400444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735a20616914a77a5e057bcddfe24438629a0d6dd6bce444b3d81e71777a1918. 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/NL7DA2400445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42e7e7d00c6014e1cc6692144e0a631eff8e9a56f25e4ef36107ef187472fd4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NL7DA2400446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48bf8c43bb5513e5de89edeade4a4d9be34e39e9259e3722832da3e7042c0e6. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/NL7DA2400447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29557654715901e117365b6051a2557a11d9a73598d91d6f7a2b948122432c2b. 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/NL7DA2400449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fc310425693dcbfeb09d84b2dcf61b8a6160079a685e32c919c240ff1bee5e. 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/NLB602200140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d25f6bbc2946c1f9e20595e1ebf9839822e7667a139d5bf9ba2aaa7a90bd9ff. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NLB601900188.
Heerser over Weinig, Meester van Niks (Akoestische Versie)
Heerser over Weinig, Meester van Niks - Akoestische Versie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91efa8a24533eca42f40821b8da5e2bc17462ed970d6582f01ce7fe2ae300d0c. 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/NL7DA2500174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44785950e5c7114f9b3c8f68ffbdfd7c9923fd284f89e05da13e24b069424874. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/NL7DA2400441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109e965c755c4264960643737a1b863d36120161c457b41382568ff42e6bc7ca. 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/NL7DA2400444.
Jan Douwe Kroeske presents: 2 Meter Sessions #1768 - Vic Willems
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8e25587f1abd6c4f701de4d872497935352028bbeb95aec7da69a7219a915f. 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/NLXZ51700012.
De Beste Singer Songwriters in`t Nederlands