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 0x63e7a6b50e72b5b8ff85d1868abd3315141b3e2e31cc4ae86df719cb7f354627. 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/ca00583e-c440-46c8-8e49-1ceff8977946.json and https://artists.proofprofile.net/proofs/artist/ca00583e-c440-46c8-8e49-1ceff8977946.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 0x6fbb0761ec6b4046dab89e06e6d5b419bbb27869ca48bd812025ed803542d78c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/AEA141603556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbb0761ec6b4046dab89e06e6d5b419bbb27869ca48bd812025ed803542d78c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/AEA141603556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc0f50758dc03563b260ea034df1f15466db9500dc9f0eff32ba3bb55c44252. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AEA141955219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc0f50758dc03563b260ea034df1f15466db9500dc9f0eff32ba3bb55c44252. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/AEA141955219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fb222d9d49816bb64616d60432fcb1252c96e973e7a9ed9a94915a5649c413. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/AEA142113755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc996f5b1369fb9322a4a33bc71cc3ca1def391d6d168a4de64d1f671424f1482. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/AEA142105572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aceb37a65f911f95258e42cffe66de949b17ca68cb719f60ff7f6fa3f9f95bc. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/AEA142211248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aceb37a65f911f95258e42cffe66de949b17ca68cb719f60ff7f6fa3f9f95bc. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/AEA142211248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf5dcbd204d1d06441b6d3cf0fedfad82fc29e00e84fcb61ca85b4ab20e6c2c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/AEA142211830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7357a0274e96440d26bfea23ab8603afca42e993775d3f9ffee278342d097dd0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/AEA142303064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9207b8287a4e4799260e2f03dc45ec22ceb85942d435bfb3277ad08802fcfb72. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AEA142303066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7357a0274e96440d26bfea23ab8603afca42e993775d3f9ffee278342d097dd0. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/AEA142303064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9207b8287a4e4799260e2f03dc45ec22ceb85942d435bfb3277ad08802fcfb72. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/AEA142303066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86392e8d229663d7ada664513f8b042572415cddc9d79e4147838ad903a10ac. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/AEA142303920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86392e8d229663d7ada664513f8b042572415cddc9d79e4147838ad903a10ac. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/AEA142303920.