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 0x5ca94eae7c6706a8e25825bffc7e846bd3df443031b522076003a74d93a8cabd. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e3c7478-1a78-47f1-b1d1-cace5efe4d97.json and https://artists.proofprofile.net/proofs/artist/9e3c7478-1a78-47f1-b1d1-cace5efe4d97.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 0x49f9229eca194d265e4c1d20caca2d2b166965dd6c93a80704379e6ceb0c1646. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZDA72504143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a658bb8a3b0b88d0188acf9362b311444a01aaa1c883a468db11472b602f85b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA82560095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912cf1bc60f6165bcf75cba8392264fef5b8633930d664563fdb899f0c4b37c3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZES52598182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57d19f4d42b87b19a4b45e4b27740bafe416b881bcad555142a4b9d1fb122b6. 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/QZES52598184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c68c0f69f286e4ec8669e49b800bf9caefa115012ada6207a493754bcb5eed. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZES62538597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bde5dcce10884e24fb35fb39ea974f79815ba467cd81b74ff6608ab134ed517. 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/QZES72553401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c899f40e7d7c734b28d9c64e03ecb0d43fab6c1e82207ebd71133309ac19c5f. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZES82501573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a0791406c0522a7df517091826c1804a7ad0fb988c1a0751cf7353a45f2664. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZES82501735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a05efbb4c79a02b9b7d207b79f8489bcf8b710ff178d28302074d2690e0853. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES82557070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c9afe647530da75bc8c675870083c58f953f12693e05dd56f2575c1c0e3568. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZES82581659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa00a438435b2e07ef1a65571e0b9d4f6b4c8965e4cd898457ab9a1b14d71e7. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZHN32503524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260ddc5075430830bc66b0ab71aab23bdad35f5cf2fcb0b417d7cd56a53141a1. 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/QZHN32503525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032637de738497b8621c05ea0ca2587e17e904a6f5478da6c8d889178be8a73f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZHN32503526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa915639ec6f560ef5d267907345f54f4569b11df0fd437f9f1de970ec5947e07. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN32510052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db05e56dd070e51b4ed5f38eec339bd8976a92063aabfc1432c80663a37903b. 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/QZHN32512081.