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 0x883b23169d73a2191b3062298094209441c327426ddb90de41616e11404893ca. 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/72d019f8-6375-4df2-b700-7254d5351509.json and https://artists.proofprofile.net/proofs/artist/72d019f8-6375-4df2-b700-7254d5351509.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 0xf56284a5193483577aee0390a202dbc3bb85f2c350023f318455d8932c739c0d. 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/QZHN92220137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417ffa59f652ea0ae0711703d6e859dabfbb8aa460d23f59a2943c955f44a6e0. 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/QZHN92220138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b9707e4c68987c59f0169aefa6215b77716431bb73f386ea55d9aee801f313. 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/QZTAT2161033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccadda7e62f2a66fd6ac4af00fec739699ee6116afdad830bae4f5080dae83e8. 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/QZHN62160247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2ce55fc2ae5f134c98a54ffb19cf5c2189f10157cfd1e7dc57e35bf94f788f. 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/QZK6K2195032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5e86361ef2431bb9abb57d4c61142471da6bc263aea2bbabf07236f13254b1. 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/QZNWU2028011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d6c670dfac3cb8b1379db3639a32dfa22306c71758a9b6e41e502acb5bf53a. 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/QZHN92220139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e7003215dc03a88ab3753b6fc74c83b555a37a0ab8b5208093ac15aea4073d. 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/QZHN92220140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42038626986d89172fc9a2da73801c0266e290fc2bae548186c4214ec6abb46c. 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/QZFZ32362142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b97c58a7e3f480794639c9334c892032f07646c877630f04e03ebbfbefad707. 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/QM7282312644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce510816df2fbb5522988986db78802a9c910ab0b8702bd7ab1928fe6d061ff. 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/QZFZ62270682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf35bb4dd5e88711b78adcd8d2c45800a7931515701685a5c13c9ff73583125a. 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/QMFMF2387498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e811dccad27ea89d5dc9b1f527f3e10227b42f2175c2e8ec79d03ac67bd544. 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/QM4TW2497842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9202b3b4ade68a9277a3c7e2bb1f71c38174aeb16eb1a5aa8eb9db5534f00521. 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/QM4TW2419752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e0dd3679fe0759cb28d6f08a2bf4709e9801fb9648129ebb5234ab0ddcde93. 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/QM4TW2419753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb108d8755bce775d65ada260146817e54c87a1bee73e2e02bd15222f3f75615d. 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/QM4TW2419754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef15d7a20eff5258d48e996180e7900d227de3735b8b469d1276c5cd7f81ff0f. 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/QM4TW2419755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7137d462f29cb6dcb88e48734640f9a7aa254bf6ac214da32fcba74f67d0bac2. 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/QM4TW2419756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b5967da8251a9fdaf0129637256aeb0c094ffa69a0d01dd6f38538d394291e. 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/QM4TW2419757.