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 0xad2eda727f9b335920be1f19bf8f433d26c2ce3b6a5c12b35b8cc825d6d985c2. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/143d3dae-ce6b-4dcc-b2b0-83d04cadf2f4.json and https://artists.proofprofile.net/proofs/artist/143d3dae-ce6b-4dcc-b2b0-83d04cadf2f4.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 0xd0af78a04671d4dcabab85ec0f581b0d6892f2e05be113c221aeb0dee9711761. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZTAT2472381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb29a7d0a35fc22d4af45c2a5f8f3202c60ef124b52e961bdd03577990645a9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTAT2472382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ada835d8040d9329ba9c6646a816477a8c3821fab41643eabb875450568af4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6J2421453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682a6e246ba2d0606d30b2046f33e44eb9fd5fee5275f1dc724b1095a6c91c8e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBKQU2421629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0eaff9009ff3865bc1b9cb590372be921e36c2422c06ace358b5aa3877ebc21. 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/GBKQU2421630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a821019f6872312c1a9f4a80e64e854fa9dc8a9084c86c2acaf674fcfa39dfd. 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/GBLV62322324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbf4b45a82223644f3ab1dad8ded360a1aada21951ee1d709d6ce546b049007. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBLV62322325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb529739a613337430e6fcb6ba9b48bdd9eab3ce0ebb6577e10203009c1d5b0. 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/QZNWZ2345521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55279dbfed46494954747df8bfdc84abbf2dfaa7e01b7c6c32047b69331d5e21. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6J2385547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee7a09b966253f1dabad078b98bb8a4566d8489f13cd1dfee7161e8822e61e9. 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/QZHN62325512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e857fe44f9a7314cd02c958fe6de3beef4e9632817ba9448f376734c733bfcf. 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/GBKQU2315091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c90c7cfe8b583830ada5a0c5fa86dfa54059e67f1046f71e4f01f6e11154792. 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/QZFZ22387952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70a406da9e5894da2e0f5f3522e6eb28d04bdc893fecf2a9d3433f20cbbddb9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USUYG1455146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a63a1a1eaf41eda0c0451e24da6139f3aab290b70e983a955b7bb5152f8694e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZPLS2265700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a83b09186f0eca7e9f3b2d247c6b9d668f6f9a857a9c6fff1e5dd3b8629620f. 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/QZMEQ2276555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06b830b9178b582402b61650f7aaaf6197a250d789475b7148d79d4934f057e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZK6G2294810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87d46ca013b9b993bd319b92dada9a9d11e3f28bfbc7342f170bcdda69544f2. 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/GBKQU2235919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb977bfecd0598c29bf76acd5a5dce56bb4eaaa00b0878c05af9978ca7b86426b. 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/DEH742200392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b779528959eba00fb8ebc75c603218c3df8c3c56e5500240c06ee6ac1964bf. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBLV62131566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ca4e49d9e919e5433c1de6cfe3af8ed5e887312f2f7479aea52f58ee54f785. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GX3Q92181408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fbc7c16aa648bdbf64f6c5df2ce8d5e9dba8cbb4257abe25f1f4c1f666db47. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GX3Q92180862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cfbf847912d49eaba51c2be1ac279bf79a7de4e8aebe217dc63f578ac6e66b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GX3Q92101853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ba521c3a326c1b1e56ffb1f92fe2b14d56906fd6f982164848c8a50045d3b9. 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/CA5KR2154289.