Het Tom Löwenthal Vocaalensemble en Orkest
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 0x70dc8f4779fe192946c42542602e99a437f23ea12ea74dcbae6b629dae57cfc4. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c60509a-bdf6-4642-867f-b7d01342e759.json and https://artists.proofprofile.net/proofs/artist/5c60509a-bdf6-4642-867f-b7d01342e759.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 0x1813ce4dfaddc85ff084b0f9484193700815467d8a7067a961825747f76d87db. 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/NLC359520301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95596e3f4cb13c0b1d13f88c3a148a0d0ae2cbf89bb1c90799a2fe9dd7b88d73. 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/NLC359520302.
Breek de duisternis (een lied bij Psalm 88)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379af681f4a0962b56096a84cac80f9e5f02694a31df7c7064dac47d5a545faf. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLC359520303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84358ad408619b30cbd15db04d209004f3bea0662ae3f1225e894f204ce8c769. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLC359520304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8185bcc358cd01af3cedf3c2f7b1e4a6847fcaac4e7d3bc04057fc52f1d8c66. 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/NLC359520305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e7ac30fb3ff36930b4400a0f86c485c4dc2b07a39cc9c4c3dc5da1e2eb5186. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLC359520306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f3b4f8fb33d007fc6fcf35a129e17c5a5d7d0eb88aa60ae13d62014b8be7bf. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLC359520307.
Looft de Heer (melodie: Nu dyn leven is gedreven)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c715b67f130bc87bb305a5a5462a56a3d8ab6d23c584c5c564972008069ebaf. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLC359520308.
Scheur toch de wolken (melodie: O heiland open wijd de poort)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab6ad2a3c2ef064e6ae10e7151b0bb5a784d9078d032a901fc7c49b37cafc41. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLC359520309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14627bd08498daa8c574322f2abc206cbb79b54ad2c2fb9c7af6382b45bed3d1. 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/NLC359520310.
De steppe zal bloeien (Lied van opstanding)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee7ce8488e55f6712e88d868e0f67ada8e457d49b76d8cba242bca3efd56b47. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NLC359520311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45c0aa3a45bf188df3978b8dce831bc0f6edcde7d0e4ccf2d26de564550402a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLC359520312.
Uit vuur en ijzer (op een Poolse Volksmelodie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25f9c57612bdd226f33d11a996509bfd9501b1f478a25c5e2ef5d519ad0ea38. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLC359520313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffea09e5fb4e56ec0e001329c855425b65acf61f079ec1820b74b9a10e31d58. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLC359520315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422f0cde523bd2b525922f068ffdaad6115cc79a8ac77b51a3be910b13985c53. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLC359520316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9432f2de7a5fb7f61c0708cf0bd52b8a185226f7c5d95c672533a74cb7d0a3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLC359520317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87925bf4d88b15ddcb7237d1f638fd6989ab5a0c8936e423318c8bfdd0fc9534. 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/NLC359520318.