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 0x9334e26fe710ed4a1727cc66a4a98280edb2630c816a2eac78b812bef34950bf. 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/c77e3901-b425-4eaf-bc29-61ee6b3ac1f1.json and https://artists.proofprofile.net/proofs/artist/c77e3901-b425-4eaf-bc29-61ee6b3ac1f1.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 0x43460ba1340a6e0cb9240dc64e75d4902c4451ce3f87ac48b7f2e5434a3f88f3. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTBA2494507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016e8880d8427973ca154ede7ab7fc21f8b388dbae5dc37d2e913b1e5d290e85. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZTBA2494508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b370cfc0c5c48942ad246713671d22efefec9624e82f344450ffea62b8bd8a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTBA2494509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef475086bd282943a8dfdd3dd31c4b962714a970425d9cc74d25fef2ad9161c4. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/QZTBA2494512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca47e0d55d491f43e5e54681af5507ec68d422668b988df799fe5c5602b23e4c. 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/QZTBA2494517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4bcfa1cd394df46f2e03e3d5d3d33f44e3e13993ae553ce1ec914b25d34d4b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFH2435466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd667647d3935073fdffa49aac825d59762f250d73b67e0b5c2ab961ed4536258. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZWFS2460805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca348898eeacf2322f9fd5bc560fb7b19059b9d71be4cde58a346c28869821cc. 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/QZWFX2481536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1481f3e0918d74ff8ec4ca7b7e733ffa5d4bbe1461b6d9bef49483d8a4e0915a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZZ7L2448866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea7482fbc50537fcf01e92b62b72a58c4efff6c3f3f9bc51447f341b82866b6. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZFYX2537910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dd8a817c9ca1946413416ca174cb570adef7f4ea48ba5be204c5a12b5e4bde. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZMER2578298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a98a0b27c64b2b7fdbf24303d51782e31e0f940285a7760e4402612d56b4f3f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZMER2578299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748b459a1f1267bb4c029161dea63d4650c2f420afa37c6c6aeee31418a5b15d. 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/QZMER2578300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688bb8343ff67b058d9fca152bb2ae3b5455463c2e3d6727f5f171db0831702d. 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/QZNWY2556283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6065c13ae108c739d9c387415d7e6cf70d3a38153358ae2b83ab4d99f2968c4. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZZ7Q2567677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e5c8f6cc47b0a757c5ecbf89b5da86e0177e1280713d37da3d942bae59ad1a. 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/QZZ7Q2567678.