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 0x2b53122c1807ad5819ef1a3b8c8a1ce8a3701efb83ebe8545516e21b839d88f6. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74602d6d-3196-4c25-a962-06d5721c8ca4.json and https://artists.proofprofile.net/proofs/artist/74602d6d-3196-4c25-a962-06d5721c8ca4.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 0x0d4dc1cb183d36dd2cc159bf4886407e34c29a5b46a1e6d64e369ebdd82252b0. 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/QMFMF2345027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd305733d1dd9bbe4d9e3510042f6d91653ed86ccc15aab8f8419788bbbee5891. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QMFMF2344789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fe3e740a34ccb8911a1bb1694e2a75751a93aed06dd4e9f60815c676992294. 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/QMFMF2345026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c836c0047c83a3a55a9bf2fb12aa2f6b5cac4dcddbd7651dca01b5b3ea26e2. 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/NLH211400950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ca4d11d8f6bae7a5c0ab88e3da6938a94e291a431374297911403925c7859a. 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/NLH211400951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32e4c77221a05aabfc567c8705f12ceba242bc33ce9c36d350b32dbec8ebd2d. 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/NLH211400952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70746aa8cbfe635a631a414222460033266205c417fceb5defcd605c2945972. 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/NLH211400953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d12b1e364da501504c1fe35d77614c1e8504a946d557a7fa25ccfcab3a9af7. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/NLH211400954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12e505a8db200d7d78f95f26e6f9535b9ff8b52ebee8e7b6c7a10760c83bd61. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLH211400955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c399ad5c6f6853c31b2cbff7d0bb8bd405b0fcb0ba69a162188881c875de760. 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/NLH211400956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda89349129447aea28d13165bd626f2d1a1d0550873fa0af1b90045a9cf1d6f8. 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/NLH211400957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf7c203735bb00b28558b1861e816ee15e183e51f21cf71d1d7fa766f2af948. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLH211400958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867d7b96c64ea7a5418a5aa7fec4446741bde2d7513ae14dbee98f044aaf0440. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLH211400959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f84580a5e3bf91d1a0f71c4fa71aa7610f4f1662beb75634e6d18a16494630d. 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/NLH211400960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd305733d1dd9bbe4d9e3510042f6d91653ed86ccc15aab8f8419788bbbee5891. 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/QMFMF2344789.