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 0xbb4c05f414f9dfffec6d5c69d6da2a4ea4e0eae21621ea28a0ebe741d1eb3801. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a391d63a-c0b7-4fb8-8223-4e93305e801b.json and https://artists.proofprofile.net/proofs/artist/a391d63a-c0b7-4fb8-8223-4e93305e801b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Christelijk Sliedrechts Mannenkoor Ichthus
'k Ben reizend naar die stad (Liederen uit de bundel van Johannes de Heer)
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 0xc6c25d473bfc12c2d940099335d54add0f526b162be52130bdee5fc9fe53771c. 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/NLL6R1500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb66c359ccfa10015d73ec1e20bf8d7e3bc3883dcc3b0cb01f0d112f31051b3. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NLL6R1500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9578fbde56d68b9be11d1c8e2b2f3c9ce1e69c098055b56c1bb8eca15917ca. 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/NLL6R1500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20457f1101e5f7194271da0429132b9dcb48d9beb9fc366d72cf82dc936015b1. 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/NLL6R1500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c73afe0e61358f5cb3cbb18994d29ef5cc63b248f1a92d25185f6f5ed8bf3e. 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/NLL6R1500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b02c3dbd9574018ac1a0b1356925f16c31222d72615f694896bdd4e112a3f7. 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/NLL6R1500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ca39cf8754db5239b7bd802a59b1e80def5323bbe008215064fb4b8e31929e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLL6R1500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6befad1eea9ff9d2efaee4b0c0b8fba453090b96a4d55685f653a445583e30. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLL6R1500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66dfaf89001cd643c3315c7d90f5136c522756217cbb80f0cedc0b4c73c1ece. 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/NLL6R1500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859c470e2d4625f00b5a6325ee55662db556f8acaa300c818fce001c16177ef0. 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/NLL6R1500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2901dd2fc640741f38fd43e66cae1a24437f31712df9a69fbe959b9203fa92. 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/NLL6R1500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1347fdee7d54d18e8e18d17815b6213aad5308b50df07d3c17a3bf6dc4504fc5. 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/NLL6R1500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81ac618db12a89e28851cc1075744432c38f47cba1ccfd8d8ada5d56980f1cd. 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/NLL6R1500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fe6ca108d1008a432bff864240bead5af90177fed9cc8019685dfe134c5e2f. 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/NLL6R1500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898929d53c90742b578c7a74193f6d6126c94d2b278b5cbac1afd42be74a8bce. 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/NLL6R1500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6871b4976cb5ff8a5c6344d243c032958691fc27c2f75740e0da15ab03d36d8. 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/NLL6R1500039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed894bd75e9d5073a0d3c29a3462dd3ef75a27c2c0def205498c1891aacd2e4. 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/NLL6R1500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efa481d4def9250f936121dca268c982a50a975820ae24fbd3b749ba61c4d3c. 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/NLL6R1500041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0eec50b11badffb592be43f6a5d238af538e6992683c81e8453fabe62750bf2. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/NLL6R1500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50f6cbd2dccdd31ddb22411e4a13ba5a13f65613800054e625f9bd425b89c89. 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/NLL6R1500043.