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 0xbf5bb11d6357825306f38b8dc9ebb75b780e12fcad6554e9be1c84d7ca13f03f. 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/372f287e-a110-4baf-93c4-af6b0cd6682b.json and https://artists.proofprofile.net/proofs/artist/372f287e-a110-4baf-93c4-af6b0cd6682b.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 0xae39f17224d5b42029eebda4afa3a271ec51801a4ffdf0958d42cb987445d091. 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/BXIV82166972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1068cf0267d3133f07ec7fe1b21d45f2236e83ac349865e2e71befc9d11ddceb. 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/QZGLM2419274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffe9e3fa6a1924d96a8371c72a3c03cc3add7079283bd06f7ad85043c776982. 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/GBWUL2284299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69d902ed54da0bd126dfaa141993ce767cbc7bfab31ef8705f50df1c74549b3. 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/GBWUL2385273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197bbf0f54bf6b7576f546b7127201cd03b4fd7dbc906c3debbb8ea5e364c257. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCRK02300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566dea70ada673974baed49a4470feba7b88319ca8ede2b04b86dce9237e4802. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2270248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe471df0a69292b56ba687e09ded13bdb4360653b7114f7f6064dad91b57d85. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLZJ2237174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d31c60920496a6933eb94fc122b861c3aa92c0cee170192e29b76029961445. 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/QZTVM2319338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffe9e3fa6a1924d96a8371c72a3c03cc3add7079283bd06f7ad85043c776982. 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/GBWUL2284299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5df66797507eabf4e83a3badea7324c8b736cb163ea015134d2b49a5ce2df94. 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/GXF9Q2529888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc25fcfe428e22477178494c859158ab17013d2b69a5d9ccae9ad8061ea27bb. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZWV32397366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b20ca93d7809f847f20474f3952e917d7147790008d32da59dcf00aa23aef2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZWV32397373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d408fdfbdeaa729cb71245948e2f82f59461b9b53c9b3b5ff27c2b7a0d27f3. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZWV32397386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde19d3639d5265d7e993d8c5bfbd2f3d9073c61557e5ab850525fa8bbddd040f. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZWV32397394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40b093512ed4438313b71f9a7e13f920e698804c93331251ad3d35c19db5636. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWV32397417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe096082f5377bfe86190cfcd9081fa80e3568c154825924039e23ff09dee00f6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZWV32397505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469448aeb6e3fbd26b72feeadf70653e82f6e32297576dfd6d770c16d66023c3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZWV32397675.