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 0x0f75be7ea2ee0bb4ffd17cc5efbeddd4f044a3f116865631b437b79ee88a72c1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/669ec08d-b7a0-4a90-aa9a-b3171d58bd39.json and https://artists.proofprofile.net/proofs/artist/669ec08d-b7a0-4a90-aa9a-b3171d58bd39.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 0x20f86c1386766bb49c4551d7860dbc8cc30caa2cf20017a14b8ff9a819355114. 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/DKADG2200265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e1e2721659141ab2dda0bf3d4b6e8c05d078f6a2636f96c0fdb6694926b6e2. 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/DKADG2200263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69994f0f891041270f8576661271783ab817ee865c8241b8829025b187fa3dc2. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DKADG2200266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b685748cc4191e1d2823bd21bb0828026fa570e2843d0de902b1575b252f614. 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/DKADG2200267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e6f74cc7eb17aab6f792f27880b90ccf84615899bf4349538e12f27d0991d4. 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/DKADG2200268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5bab5458e56bd2f6098c58c65118b199a5810bb57db08bcaf5ea752de6aabd. 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/DKADG2200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5bab5458e56bd2f6098c58c65118b199a5810bb57db08bcaf5ea752de6aabd. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DKADG2200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f43cf2c3a1beefdd80afabac79e323f779a7c74249c8759d316cd3711f0dbb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DK2DY2400239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d2de5e383702400a08ad6ec996d806ca6abbba5b61118c9feab701e8a735b7. 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/DK2DY2300438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d1d8139add39711a594943b87d3c1695fd089da23efb554afa9bfacd22fec3. 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/DKADG2300123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ffedb8a5941f37c088addd60a8cba97a2a98eccdab7825e90a2c432d252633. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DKADG2300124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae20b5f8a7ffcc9da7bb5bf8a3cebf7a77a6e9fe9660b86b3c83108d9c3b7054. 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/DKADG2201144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed623776fddc5929d303098285c75541636c7d5a3b4c119f810cfc4608d4fc4. 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/DKADG2300125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11de2d63734e7e760efac5511f9ffe82202b6a4ac0959c74d8313370bf3d87d0. 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/DKADG2300126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e18f05efb6be21bfe2bd47ea6e676ff2585a1147cd3efa470f443671b69b7b. 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/DKADG2300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae20b5f8a7ffcc9da7bb5bf8a3cebf7a77a6e9fe9660b86b3c83108d9c3b7054. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DKADG2201144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bff36a54da6c1e83eaf76f13c969ac9ff308a2d2021dd50762bb79946877c7e. 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/DKADG2100758.