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 0xb6d9b6c985815ce73b29f372bf9f3010cf1e949fa87a8e34b0d98c110e5f0e95. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d877435a-e047-4e47-b6b3-923baabb2b8e.json and https://artists.proofprofile.net/proofs/artist/d877435a-e047-4e47-b6b3-923baabb2b8e.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 0xc6e231aa7946d702f15e6bea8fbb5089ca9c4102cebc7a20441e7bd79d7a8530. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ZZA0G2302076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75fd2cc83ab2c1f202bf3c4f8c51d85a027d8444069848bc4875a58b1a398e0. 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/ZZA0G2302079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2b89f20cb0de2e663e0ef194a7e6f206e454a46af3721201e607ed26265286. 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/ZZA0G2302081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64def8275130d68c7bf5071472f7dd2c1f28f4dfdeb65f84a765b7ffda296ff6. 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/ZZA0G2302082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514e80d71c03bc470c41ac9b964b40a659157056954e472e268a51619f9bbfe8. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/AEA0Q2098197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4e049bfc7bd8fa3ec55677fe25e19fc0c87a7fcee8a28daba25c3989ca6303. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/AEA0Q2098198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01bd90c91c5fb4fdfc25ab38ad69030282d9da5ae4a42b7ccaa312c9710092c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/AEA0Q2098202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf722fd6bb51a6213da237e4a0586df8498c44767ec7815f68000f7482cecfb. 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/ZZA0G2302233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e717a8f7c9422c85a2a6175c0866ba4d2587a36939ac3ae81894079aa09c6e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ZZA0G2302234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d52e822b9ca0e51de73a538769eba865dee021372fe4feeb6fdb18c88d5811. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ZZA0G2302235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d6c109a7b4a0ee0c1d2efbbbf24ff8e9375d71a57c53efc7763b95365adee2. 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/ZZA0G2302236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3021a4fcd266556f7ab9adc2d4da5b075ab2e1770ed40435c7d0b98117d9062c. 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/ZZA0G2302237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89ae8c45e1f2a7d38f0fc979ba01800ae3f619847d4f905d05692c0cede7c11. 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/ZZA0G2302238.