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 0xe155d9026a71d52a29557e4d49faccd2d8ae4aa4b1ffdf240de49ac9877c01f1. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d666ff84-10bc-4713-bbc9-4f5df5635c49.json and https://artists.proofprofile.net/proofs/artist/d666ff84-10bc-4713-bbc9-4f5df5635c49.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 0xb61588dbf5b71cfd81589864d4bedacfd2bbcbb0df87b5203077c3139f2e4a8c. 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/QZDA52300689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a5b030d8e409c7b52c9f442b10b9a28cfbefa17d7c295cdded176882d85e3b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN82309781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b74f2f177e1d364a311b4e6b9d0deb0bbbbae532167f464d9e2b63fc0be8b42. 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/QZNJV2345815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23570fdd7b7879a0609c523a7df136ee365cc50bd8bb8740d928b0939deeacb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNJX2328115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ccf187264a703cb47a44ec66f9d283bc231c17f4008e5ae2ea2d89f1f47925. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTVM2398173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e8ff620fafd530a9f71251a2beb63ad8fced6cf2e0eb466ef297445aa4b029. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USYBL2401861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec94e2e8e2de0849867a982d4adb1271b5db3c2a490fcff7602f8169036a0c8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USYBL2402347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77c0a37e58940a496498a69e630631b20ce33b86387ad57f84e1987666870b4. 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/QZGLS2592151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c95782bb5c5a6333c20a91dc8134c57560a3555fffa27fe6830aa7eb5426fd2. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USYBL2501234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5797e09a66e71f2871b2f971c17758f9be297af8a6229995b8931baccd44073b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USYBL2501238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eddfaedbef3ffef83510682714944fc0bec87a5bd31a9f7e03cc6881a2f66c9. 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/USYBL2501235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e3297fa1fcb6e8fd59bd2ef5104e2483cbe8335d98a27ad266f09c7f9ab290. 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/USYBL2501239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd60e9a81d5524ed1e6620edbc8f8b31083a2cd8c96495d4220f2baaf4280f2. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USYBL2501236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6522a50ce269410b5bbb7c628e6c8992bcc79c102de81229d3520252589b51d. 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/QZTAY2598623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7efad78fac13f324fc17a8f3c15c1da609bead064019ce46b42b6899040182. 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/QZNJY2581316.