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 0x6127ee4287a53a39ad15a81213da92fbcd509078f55ba53efa1256db345d6e18. 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/77319653-dc60-4eff-9e13-727fcb4c9fad.json and https://artists.proofprofile.net/proofs/artist/77319653-dc60-4eff-9e13-727fcb4c9fad.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 0xb8261f19821b41dc2b882585e493553b4c78494ecae42d9429a312af2e60e048. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6P2192422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9672403e1a081decdf25f9530b5a5b93cd836ada08c9f9fe6649b20365cfde90. 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/QZMEP2155005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4d02d0a426376f185afa35a52758698e4e43e2974c98fee9fdbfebd00b4642. 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/QZPLR2181056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a2d4b9890abfe06c396b891cc5fd19dc705909bf965c75c9cc1ece9578e8b6. 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/QZHNC2285890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39688ab799c03522fe54bd683e493dbf86cf8a89b97c7fb7597e27bd77a3677a. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/QZHNC2214073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ff261d637ec1fe002025e661d002d84aae3ffcfec8fa0487cf7463b5f49496. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMER2206432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b04c339ebbd8d3bbd65a14e3705bdcab07e2630f5fdb8a4b105b30f4f4ecd1d. 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/QZTBA2232107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be973f0a6a669910e6bf7232fad27bb3dbcf3c269e0b7a89dc1a7396a796a8f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHN82313917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27530c8e2e1c2dbb2d05ab3f546c4c0d7a4e76c74788ba32f7be11733b5afa2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2338902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa1f424229a81da1944a4d38d14609004a62b3808350a104e7991a055f3f172. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZNWZ2376563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ef65417ffddf91a94f270b47a1fa83a2b7eda6653057383809705269ce1cd8. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTAW2397049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb80c472931d177709d77be1943bde1b6d879c18a3ff2b5f2a9dceab8c101d12. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/QZTB72311411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44ec29c27b27d2a30035ab0a4fed32f08e4dc85fe0a5e9ca016d1c3077af1a4. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZWFQ2342200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631038708f4c78232327765d0b571282e18f84e2c1e184c6563c8845cda6fb43. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ22454057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6d45c8000906b3a8f66d4ffe9e4d32b21e674277be0f97587d11717b6ee774. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZHN52430953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52bfe66ec859637e8f2b47f840b26fda76471e3e0c79f8db68de74ab002872f0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6P2466523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9941d335f8964a4bd874192c0bf9939c73271c1faa079f016ec590235a6d5956. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZES82174823.