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 0xb858ce96a8a3039d2a56edbe9cf88e7bba833df02f821abb873efc5bbee2af8b. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23d80a37-10ec-4a5d-a099-420a4c50953d.json and https://artists.proofprofile.net/proofs/artist/23d80a37-10ec-4a5d-a099-420a4c50953d.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 0x65493edc8304259fa285a38f7fd753ea183d01b203d295e7ca1e80b8be38d56e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM4TW2255415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5bacc4ed32bacba2c9c839afe4f6ca1a89bf391155c6c89636a4b15ced4af0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMDA72191370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3fca080f05383651714e9fab587acbfc59f133db8dac415dd0c2fd561c8f68. 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/QMDA62186821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5815faed4facb6ce148859ca65967b39e43bfa4328cd753261f245b995e957. 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/QM4TW2255418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab51ba574ce61c13e88d64e7c46a12e08223eb6657277bd38a4d1a1a99be1734. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM4TW2255419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3538517c7a2bde0165a87dd96845efa8260a3cb136bf6abf1e97627f722e8abe. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QM4TW2255420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcfd1300c7c4e32201d28b688894123513d63cc1956c35e78efcf031c80c83d. 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/QM4TW2255421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b94c4ffbf2f4a825b192622293b82cd6530bb9f9f5fe419928dadfd82fdf23. 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/QM4TW2255422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3548c62b9350f85d5699c4ce1bff99ceeda975d587f82a37ef9a688ce2e22620. 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/QM4TW2255423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812fa8586dad6d31664c60c122be896ccd2af20b8236f50ccb07462b51c978d3. 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/QM4TW2255424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3fca080f05383651714e9fab587acbfc59f133db8dac415dd0c2fd561c8f68. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62186821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3d2e04f32d27ff25f2b597dcd44f42ac08c151c6b195769e76e4bdb25a3cac. 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/USX9P2386661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed74984ae1e4fdcaa5f596926a6927a02ee454caad8c790b1aa1c3bd68cb5e1c. 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/USX9P2386665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da9294aeab9147afd4db76cc5c0052af89c518f4264f7d3fec7eda62e2626ea. 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/USX9P2386666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d325b8a7f4856f64e29a73ab8ef51335acca30906b5893f23e1d6ec6b4387f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USX9P2386668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13797d8cf09b408f3d48449980040761fed72ecb47d9484deb3b608b59eca7ea. 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/ES6101800407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95661464b1c38e3f28760e94525eee40413cf253cf7f36736a10c9d3e85f7ec. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ES6101800408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f81272d5a39ee3e3c09da9856a52fe9214e4c7e03895020f945db17a5ae14d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES6101800410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf568a6b16b781e37db913f5d487af658029c9d0bc3b7737b7ac0e434586a69e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ES6101800411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c40ac62f616d065bae16bc12bfbbb280160b1dde294c2068d2ec6ec90dec962. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM92125387.