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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d35bf3e1daab25e660b05802eb428df5ec3d0ecb900e45d7d3668a9aae5dcfb. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ba592e7-90ac-44b6-8b99-d33e20a11bec.json and https://artists.proofprofile.net/proofs/artist/0ba592e7-90ac-44b6-8b99-d33e20a11bec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Esther, HWV 50b: Act I Scene 1: Upon the right hand (Chorus)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7115ca3118d91516e33d6807e3bd1310ec56d5cadde4447f71ab596e56ebfbfb. 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/USB8U1074543.
Esther, HWV 50b: Act I Scene 3: Shall we the God of Israel fear (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37b21f98a3d3e52102d778729057016d2225901196a55732fdbd339b3e59977. 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/USB8U1074550.
Esther, HWV 50b: Act I Scene 1: My heart is inditing (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb3fa9221e0a1f0e5d8fc6e387ec36cb1c7706fca2991c94f4a995f706df646. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USB8U1074541.
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
Esther, HWV 50b: Act I Scene 1: King's daughter (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b41f9f0dd0966ebcb2b1d6dacd3cbc5bf8144b4e8556e7f466985df7c7a399. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USB8U1074542.
Esther, HWV 50b: Act I Scene 1: Kings shall be thy nursing fathers (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b716d9e11e1faf0a2889800d29b118457f022b68dc6f87fc9522cd362b40ef. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USB8U1074544.
Esther, HWV 50b: Act III Scene 1: He comes! He comes to end our woes (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8e72187e28681a1fd780242af7cc43292ac198ef7804d8b4829d45ad0bd93b. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USB8U1074577.