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 0xf7bd69c5e9cfe2ba1114077b12943e3deeace0ddc8c828d26372b285b27ad9f6. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c2f29dd-5776-47f8-9171-0f5aebe2cdb0.json and https://artists.proofprofile.net/proofs/artist/9c2f29dd-5776-47f8-9171-0f5aebe2cdb0.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 0x432b830e2c5cbfc138ccf4e360a20a56edd9707d71dc57c37bcc3948d135bbc8. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZES62339265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300f46fb25321365ff32bb74863a947bbde2f1ef08fa10d9d9a836a7e21840ba. 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/QZES62339266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586c5a4afc1eb36d752cf50e0b1ac1001003cf43b83298493ecd63228c114374. 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/QZES52399427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6461365c0818960f0e9c25c347c67182bb68842a445584b0b5e8bc7afb4ede. 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/QZES52399428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44814b270272b2753ccc2bcd69d8e731190c97c90631c0701c2f033569ed7101. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES52399429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0395c4783fe0ab0a872ea0003e7754107bb88df51aafb91c95967ae0ea812ea. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZES52399430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9aa2aa9227a1055acbcbb9350f79bf8e2dea0eea48512796132ed23579ef63. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZES52399431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d666167fef34a8983a12547c845136156415f30a2a39175beeed3cd5f6549b. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZES52399432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2dd44bd03eaac514732028da9706046131c8f3539e17ac44e82111b7f263153. 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/QZES52399433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc93b3ff94ff3014a994607bb8bd01c9d8571143aba2482c8a6c42faf08567c. 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/QZES52399434.
Medley Boven op de Dom / Utereg me stadje
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8c83173f6563a5b48fa5cda4f7de80cea09e109414133a91b70c2975f2ec9f. 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/QZES52399435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045d6677b8754bdd6b4cc6addb506472e905685e5b926cf968802423ffd4ee2d. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/QZES52399436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ed4c21c50dee8468a292339f0c6532ab4e385f42e1b4be44803f54c6d7122a. 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/QZES52399437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e407a038498ddada2fa52c751e8bcb616d2781c7a9badd0c806530216e0f37e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZES52399438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0684dd21e055a023d8cfbdbdf4d44f022a649979caa0a04fdf8ec85a63a28a. 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/QZES52399439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa804df4f6f9c9d544f081fa3984da7f4d1a8d5dbf49c52199788e334ece93549. 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/QZES52399440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad32f14e59a8a679c33ea7bb99eeb380e751b35d8e39e08c389c0a5b839c131. 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/QZFZ72305788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268e8d76b3d9e9d0a8e19c45080a257a6e45d5a22ed034aedc819780cd261d4d. 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/QZFZ72305789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7714542dcd1389efc083543486464b6c49122352fe952bdfd83a910cf5a3ca3. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZFZ72305790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38bd0ce96940510650914b5c3f02a678f0ae3e63ae8ba26a2d94589f1dd0272. 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/QZFZ72305791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85753c0d543fc49a3366a4898618f1e5c0a052eeff0abfccb82bc42cfc074199. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZFZ72305792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67794eb5257e0e57a7fcf018a85f6e147f16f42114ba7154d105e8ba2c0e250d. 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/QZFZ72305795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4da23af390e089033e7419b7dd6f03998c7435d51407b8209e8a2ca59d0002. 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/QZFZ72305796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61a8917a4c81fbaece50a13c61fab0a4683e704a435519b03a3629dce27602b. 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/QZFZ72305797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4b35b97e6254bf55dfb432568e5bcc1cc8ebc70b3d990dda3abfa07f489b5b. 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/QZFZ62369740.