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 0x0b6664fd53eb5395c7b97ad6c1cfe9a698caec85c24fbd791c0c274ac98d113b. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/801944aa-b04c-49f9-84e1-4c30193a5a76.json and https://artists.proofprofile.net/proofs/artist/801944aa-b04c-49f9-84e1-4c30193a5a76.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 0x7cfdd73dc5362cb504e880d638920417fc9284455bc8915ae5b522bfaec60527. 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/QZES72185026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2bc4744c379fdadb9d37cd5948bb47394fee9e895d5faa88e74a005303a87a. 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/QZK6N2157391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58132180fd7d0b0ce5f5877ac2f61d199a2cf6baff113fdadc97095a940b48ef. 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/QZNWY2152166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf97fa6fd3233f2af3c032ae4de72ef1e1aa3e6bf7fc880ae64a987ee189cf4f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZPLS2210370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5adaee852b19f2410241c0123926821b1aa27471e7df8c8572b0fe988271ad. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTAY2262204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc20b9a9ab761156c6b24e8d292a53f20e326570bb89208a2da50351bac6d49c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEQ2313450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82549dfd7e31fe2291f64a53e07571dbbd2daf7d6a1589b8ddee3fab27a874c4. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZDA72432306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b36ecb511e14825d46155fc65582f832663b4dcc0559f45acef7deb11118bfa. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHNC2440221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ac4496bcc02409594314c0c02c7561ed1443db3d5d75cbe0c8aafa6c2fdb19. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZNWZ2441235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f5afff53ff759ce3efc66e287863a4f479adeca6475453c2bc54d331c3cdb4. 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/QZNWR2551069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c94b06f89195aa6a1c5858fab6c7f4de7509e29f4f023973dd0731a9b04d60. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZNWR2551070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d656a658d107e2c09d2815461607968884a10597188c8c6363303844d6fe192. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3EX2590943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90fa2e4a3a2766c759e6a25c16f2046f114463c20bb1a90eef1e0ef452da206. 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/QZNWR2272313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8aaa32574a29516018ecd4f99abfa176ea7148860490e7e832fad8d2b56f32. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/QZNWR2272314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0207f8cc031623928b5852dd79c7be51a56966d89d9187da9c4d2389fa08a955. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZTRX2445265.