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 0xe1fda42304ba98d56fdbce0c2e720c012675a11b16cd8445ceb4a77886fc5dc5. 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/3634e0f2-5dcf-430b-a046-67444876c054.json and https://artists.proofprofile.net/proofs/artist/3634e0f2-5dcf-430b-a046-67444876c054.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 0x0c0d0bd6dd4c3ba5b70ca71218520b2c3caee99e5b13c26edbdaeb68fa0bb6da. 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/QZFZ72393233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabba31926ed7d99aebce59dd55afabe5812cd0dfca84d4cc33e9825220041461. 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/QZFZ72393235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d8560eb98ab2db07785c025d13415017ec4e0d7055212716ee0287df4fde3f. 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/QZFZ72393236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb47b9ab0cdb4005e025577be62efaccda19afbcb73dc355729fff0d76131c3. 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/QZFZ72393237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63317503fe28b85155992e41cd1e08132724d92f51bf8815ffc8068bc6bdfaf9. 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/QZFZ72393238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe126c875f07bef5cedffbb8a1cfda94069bbd6c9600a2bc01657a70fd77e1f4d. 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/QZFZ72393243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed02a1f5127653f9db279e48834a5685011e3d601a6c311b988197f782b6e690. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:07:38Z), 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/QZFZ72393245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5795fbd983c248cd3fcda387d7c3376953e580346ed1bec5ef92832782f1b79d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZFZ72393246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd38ae3e06499c8213dc915262e6271850e18b2a5cdc92d7a1a6609c66ade5bf. 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/QZFZ72393247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b7cedb6afb1d2d39871450141867642a33fdf98f0f3cb0d5bdfff9b1b71fa. 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/QZFZ72393248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1353cb2f7d9d3ab34c499c97dd9647cfa7466b6dd3ca1490e9e93353f8cc0a1. 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/QZFZ72393251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67dc80eacd7f8fd5744adbd288b8b09fdf5e5cadc1c38e59dd08f71502ad916. 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/QZNWZ2210260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88bc377a1fb24057803ceecb23dab5d59d492e5cd5130f1be4900c4617df89c. 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/QZMEN2273061.