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 0xe9b2bb50efde4cc7b7fee5544318123d0e56059f54bbf3d452cda3fca654ece2. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/781b2db6-7397-4ffc-b065-10e5c09b1c74.json and https://artists.proofprofile.net/proofs/artist/781b2db6-7397-4ffc-b065-10e5c09b1c74.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 0xf5d6e7c7e0c62437953ab0e575eae8e666fc725f7247ad53d16b858ab4ec6852. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTAU2452282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8b27b2e9938d8bc156f8399258cca1b796af08211da498a5bc8ac3d6541221. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZK6G2459522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b9c6aa7764d413e2868f0a09d2625ca0036c204cc445ef57357538eba87860. 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/QZZ7M2466184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dda1d3c31c64bee1df431ca8f769d9f7a1e90e2d0c2c96b6bf65ffbd6fe3489. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZZ7M2466185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c684e45999cb1ec6a78ca885733896b0ec4f2b13a8035775ae4e5d9e16365d3. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZZ7S2440839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063dd872f55b897a32a89bb60fa9df03197825cf014686ef236c90227c44f694. 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/QT3F42422893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b39e06b5b8b4f827d502b468f3b1d568b9520c435126cc861fe20b8035f5e1. 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/QZHNC2528032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9a1feef8f759f00b9b8d8d5ea02d3d2ae52f9d7740b8aa6f8e4b47306b6649. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZHNC2528033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ef1a1033a4620a018fcf8dc666e7c0de6bc59661f267a8dd702fe5d0b084fa. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHNC2528035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb94a0d2584c34a41c306da5d58f887b49da086bb84ad974f076b89e94b1d13. 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/QZHNC2528036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca207f71a3c85b23f7b637744c71601a31b109629f9e33bc7c0bcf66a9035fc6. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZMEQ2581670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f12de29f62c56fb1263cac3da7665340737fd3b9ad9e3318ad9c9c24275212. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWX2508864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398df7078a966111ba4f81a0d8a6c4a475d2e06c4f9be13477b06e1ce1db9b2d. 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/QZTBC2570691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd36bcd28b3bd08d234fa4d5cde7ed10ff1416bea10435ca6ed25a688b73e1c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZAKB2524708.