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 0x2fd2e0392581c0ff3afd4f38c7798b541d31f9ad59b799a0b7faffc20af00897. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b73837fd-336b-4b92-b356-51709825e2eb.json and https://artists.proofprofile.net/proofs/artist/b73837fd-336b-4b92-b356-51709825e2eb.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 0xda1dad8fa78fef7f809ab51ad9b94ed8dfa089ab7502ac21fef13ba770fc127b. 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/QZW9K2267756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4ed0d75b9c40c8ae9f0eb32f9c9fa41162b96643973fccb429c9db7c4fd173. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZHZ62067607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733543cac8a3886e2c6d4588200db8c3dcaf4e7f749986f64551a184cbc95bea. 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/QZGLS2012142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e62d2ba34819be331c1f905353a7525eb43e05e1b26245f8f544c8b2e2c7a0. 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/QZGLS1962077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fd41f432c0baa46c11758f6c1471a2d72a4bef06a14db6a58844316aa1587f. 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/US7VG1908243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2013bc732032c7e8adb88be92c618f8925494f24e6f0fb76982ce56f07ad90. 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/BRKO11800089.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92cb06b44e2bca99e135945aa02569c26bb62fca3b338a5f0d323a1818195c2. 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/BRT0O1700073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a52be388a040b244a826300bca80168eb92eb417a089f4d72ea584a7fcbe395. 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/BX7P32300938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a275e23439ef164377d9ef68e1066ccdf31be96ac592bcbaa5b7f2bc56dffe. 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/BKBSS2300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa145e96155aa039c9c8c5adadf413c2688084dd104ca1f6c18c13570f7469b6e. 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/BCRE22400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb3e6d0e997b39064b09f22318c489a5d3fc7a7905d79b52d2f3e93506d9920. 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/BX0SO2100207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd455103f3c8af48fe133537c9e061e02f3ad887fecf0849bfddcb70635da9720. 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/US7VG1939363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d4de4e93b71fb971917f2fd41c2c11d7e77142d7f98c035a95b785baf070b5. 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/BCY5V2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf000383928fe3aa400f5ad605d84817fb809fbdef31162c8b3f44079941aaac. 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/BCRE22400003.